{"version":3,"file":"kendo.data.min.js","sources":["kendo.data.js"],"sourcesContent":["(function(f, define) {\n    define('kendo.data',[ \"kendo.core\", \"kendo.data.odata\", \"kendo.data.xml\" ], f);\n})(function() {\n\nvar __meta__ = {\n    id: \"data\",\n    name: \"Data source\",\n    category: \"framework\",\n    description: \"Powerful component for using local and remote data.Fully supports CRUD, Sorting, Paging, Filtering, Grouping, and Aggregates.\",\n    depends: [ \"core\" ],\n    features: [ {\n        id: \"data-odata\",\n        name: \"OData\",\n        description: \"Support for accessing Open Data Protocol (OData) services.\",\n        depends: [ \"data.odata\" ]\n    }, {\n        id: \"data-signalr\",\n        name: \"SignalR\",\n        description: \"Support for binding to SignalR hubs.\",\n        depends: [ \"data.signalr\" ]\n    }, {\n        id: \"data-XML\",\n        name: \"XML\",\n        description: \"Support for binding to XML.\",\n        depends: [ \"data.xml\" ]\n    }]\n};\n\n\n(function($, undefined) {\n    var extend = $.extend,\n        isPlainObject = $.isPlainObject,\n        isEmptyObject = $.isEmptyObject,\n        isArray = Array.isArray,\n        grep = $.grep,\n        ajax = $.ajax,\n        map,\n        each = $.each,\n        noop = $.noop,\n        kendo = window.kendo,\n        isFunction = kendo.isFunction,\n        Observable = kendo.Observable,\n        Class = kendo.Class,\n        STRING = \"string\",\n        FUNCTION = \"function\",\n        ASCENDING = \"asc\",\n        CREATE = \"create\",\n        READ = \"read\",\n        UPDATE = \"update\",\n        DESTROY = \"destroy\",\n        CHANGE = \"change\",\n        SYNC = \"sync\",\n        GET = \"get\",\n        ERROR = \"error\",\n        REQUESTSTART = \"requestStart\",\n        PROGRESS = \"progress\",\n        REQUESTEND = \"requestEnd\",\n        ITEMSLOADED = \"itemsLoaded\",\n        ITEMLOAD = \"itemLoad\",\n        crud = [CREATE, READ, UPDATE, DESTROY],\n        identity = function(o) { return o; },\n        getter = kendo.getter,\n        stringify = kendo.stringify,\n        math = Math,\n        push = [].push,\n        join = [].join,\n        pop = [].pop,\n        splice = [].splice,\n        shift = [].shift,\n        slice = [].slice,\n        unshift = [].unshift,\n        toString = {}.toString,\n        stableSort = kendo.support.stableSort,\n        dateRegExp = /^\\/Date\\((.*?)\\)\\/$/,\n        objectKeys = [];\n\n    var ObservableArray = Observable.extend({\n        init: function(array, type) {\n            var that = this;\n\n            that.type = type || ObservableObject;\n\n            Observable.fn.init.call(that);\n\n            that.length = array.length;\n\n            that.wrapAll(array, that);\n            that._loadPromises = [];\n            that._loadedNodes = [];\n        },\n\n        at: function(index) {\n            return this[index];\n        },\n\n        toJSON: function(serializeFunctions) {\n            var idx, length = this.length, value, json = new Array(length);\n\n            for (idx = 0; idx < length; idx++) {\n                value = this[idx];\n\n                if (value instanceof ObservableObject) {\n                    value = value.toJSON(serializeFunctions);\n                }\n\n                json[idx] = value;\n            }\n\n            return json;\n        },\n\n        parent: noop,\n\n        wrapAll: function(source, target) {\n            var that = this,\n                idx,\n                length,\n                parent = function() {\n                    return that;\n                };\n\n            target = target || [];\n\n            for (idx = 0, length = source.length; idx < length; idx++) {\n                target[idx] = that.wrap(source[idx], parent);\n            }\n\n            return target;\n        },\n\n        wrap: function(object, parent) {\n            var that = this,\n                observable;\n\n            if (object !== null && toString.call(object) === \"[object Object]\") {\n                observable = object instanceof that.type || object instanceof Model;\n\n                if (!observable) {\n                    object = object instanceof ObservableObject ? object.toJSON() : object;\n                    object = new that.type(object);\n                }\n\n                object.parent = parent;\n\n                object.bind(CHANGE, function(e) {\n                    var isGroup = object.hasOwnProperty(\"hasSubgroups\");\n                    that.trigger(CHANGE, {\n                        field: e.field,\n                        node: e.node,\n                        index: e.index,\n                        items: e.items || [this],\n                        action: e.node || isGroup ? (e.action || \"itemloaded\") : \"itemchange\"\n                    });\n                });\n\n                object.bind(ITEMLOAD, function(e) {\n                    that._loadPromises.push(e.promise);\n                    that._loading = true;\n\n                    e.promise.done(function() {\n                        that._loadedNodes.push(e.node);\n                        var index = that._loadPromises.indexOf(e.promise);\n                        that._loadPromises.splice(index, 1);\n\n                        if (!that._loadPromises.length) {\n                            that._loading = false;\n                            that.trigger(ITEMSLOADED, { collection: that, nodes: that._loadedNodes });\n                            that._loadedNodes = [];\n                        }\n                    });\n                });\n            }\n\n            return object;\n        },\n\n        loading: function() {\n            return this._loading;\n        },\n\n        push: function() {\n            var index = this.length,\n                items = this.wrapAll(arguments),\n                result;\n\n            result = push.apply(this, items);\n\n            if (!this.omitChangeEvent) {\n                this.trigger(CHANGE, {\n                    action: \"add\",\n                    index: index,\n                    items: items\n                });\n            }\n\n            return result;\n        },\n\n        slice: slice,\n\n        sort: [].sort,\n\n        join: join,\n\n        pop: function() {\n            var length = this.length, result = pop.apply(this);\n\n            if (length) {\n                this.trigger(CHANGE, {\n                    action: \"remove\",\n                    index: length - 1,\n                    items: [result]\n                });\n            }\n\n            return result;\n        },\n\n        splice: function(index, howMany, item) {\n            var items = this.wrapAll(slice.call(arguments, 2)),\n                result, i, len;\n\n            result = splice.apply(this, [index, howMany].concat(items));\n\n            if (result.length) {\n                if (!this.omitChangeEvent) {\n                    this.trigger(CHANGE, {\n                        action: \"remove\",\n                        index: index,\n                        items: result\n                    });\n                }\n\n                for (i = 0, len = result.length; i < len; i++) {\n                    if (result[i] && result[i].children) {\n                        result[i].unbind(CHANGE);\n                    }\n                }\n            }\n\n            if (item) {\n                if (!this.omitChangeEvent) {\n                    this.trigger(CHANGE, {\n                        action: \"add\",\n                        index: index,\n                        items: items\n                    });\n                }\n            }\n            return result;\n        },\n\n        shift: function() {\n            var length = this.length, result = shift.apply(this);\n\n            if (length) {\n                this.trigger(CHANGE, {\n                    action: \"remove\",\n                    index: 0,\n                    items: [result]\n                });\n            }\n\n            return result;\n        },\n\n        unshift: function() {\n            var items = this.wrapAll(arguments),\n                result;\n\n            result = unshift.apply(this, items);\n\n            this.trigger(CHANGE, {\n                action: \"add\",\n                index: 0,\n                items: items\n            });\n\n            return result;\n        },\n\n        indexOf: function(item) {\n            var that = this,\n                idx,\n                length;\n\n            for (idx = 0, length = that.length; idx < length; idx++) {\n                if (that[idx] === item) {\n                    return idx;\n                }\n            }\n            return -1;\n        },\n\n        forEach: function(callback, thisArg) {\n            var idx = 0;\n            var length = this.length;\n            var context = thisArg || window;\n\n            for (; idx < length; idx++) {\n                callback.call(context, this[idx], idx, this);\n            }\n        },\n\n        map: function(callback, thisArg) {\n            var idx = 0;\n            var result = [];\n            var length = this.length;\n            var context = thisArg || window;\n\n            for (; idx < length; idx++) {\n                result[idx] = callback.call(context, this[idx], idx, this);\n            }\n\n            return result;\n        },\n\n        reduce: function(callback) {\n            var idx = 0,\n                result,\n                length = this.length;\n\n            if (arguments.length == 2) {\n                result = arguments[1];\n            } else if (idx < length) {\n                result = this[idx++];\n            }\n\n            for (; idx < length; idx++) {\n                result = callback(result, this[idx], idx, this);\n            }\n\n            return result;\n        },\n\n        reduceRight: function(callback) {\n            var idx = this.length - 1,\n                result;\n\n            if (arguments.length == 2) {\n                result = arguments[1];\n            } else if (idx > 0) {\n                result = this[idx--];\n            }\n\n            for (; idx >= 0; idx--) {\n                result = callback(result, this[idx], idx, this);\n            }\n\n            return result;\n        },\n\n        filter: function(callback, thisArg) {\n            var idx = 0;\n            var result = [];\n            var item;\n            var length = this.length;\n            var context = thisArg || window;\n\n            for (; idx < length; idx++) {\n                item = this[idx];\n                if (callback.call(context, item, idx, this)) {\n                    result[result.length] = item;\n                }\n            }\n\n            return result;\n        },\n\n        find: function(callback, thisArg) {\n            var idx = 0;\n            var item;\n            var length = this.length;\n            var context = thisArg || window;\n\n            for (; idx < length; idx++) {\n                item = this[idx];\n                if (callback.call(context, item, idx, this)) {\n                    return item;\n                }\n            }\n        },\n\n        every: function(callback, thisArg) {\n            var idx = 0;\n            var item;\n            var length = this.length;\n            var context = thisArg || window;\n\n            for (; idx < length; idx++) {\n                item = this[idx];\n                if (!callback.call(context, item, idx, this)) {\n                    return false;\n                }\n            }\n\n            return true;\n        },\n\n        some: function(callback, thisArg) {\n            var idx = 0;\n            var item;\n            var length = this.length;\n            var context = thisArg || window;\n\n            for (; idx < length; idx++) {\n                item = this[idx];\n                if (callback.call(context, item, idx, this)) {\n                    return true;\n                }\n            }\n\n            return false;\n        },\n\n        // non-standard collection methods\n        remove: function(item) {\n            var idx = this.indexOf(item);\n\n            if (idx !== -1) {\n                this.splice(idx, 1);\n            }\n        },\n\n        empty: function() {\n            this.splice(0, this.length);\n        }\n    });\n\n    // Polyfill for Symbol.iterator\n    if (typeof Symbol !== \"undefined\" && Symbol.iterator && !ObservableArray.prototype[Symbol.iterator]) {\n        ObservableArray.prototype[Symbol.iterator] = [][Symbol.iterator];\n    }\n\n    var LazyObservableArray = ObservableArray.extend({\n        init: function(data, type, events) {\n            var parentFn = function() { return this; };\n\n            Observable.fn.init.call(this);\n\n            this.type = type || ObservableObject;\n\n            if (events) {\n                this._events = events;\n            }\n\n            for (var idx = 0; idx < data.length; idx++) {\n                this[idx] = data[idx];\n            }\n\n            this.length = idx;\n            this._parent = parentFn.bind(this);\n        },\n        at: function(index) {\n            var item = this[index];\n\n            if (!(item instanceof this.type)) {\n                item = this[index] = this.wrap(item, this._parent);\n            } else {\n                item.parent = this._parent;\n            }\n\n            return item;\n        }\n    });\n\n    function eventHandler(context, type, field, prefix) {\n        return function(e) {\n            var event = {}, key;\n\n            for (key in e) {\n                event[key] = e[key];\n            }\n\n            if (prefix) {\n                event.field = field + \".\" + e.field;\n            } else {\n                event.field = field;\n            }\n\n            if (type == CHANGE && context._notifyChange) {\n                context._notifyChange(event);\n            }\n\n            context.trigger(type, event);\n        };\n    }\n\n    function isPrimitiveType(value) {\n        return (typeof value === \"object\" && Object.getPrototypeOf(value) === Object.getPrototypeOf({}))\n                || Object.getPrototypeOf(value) === Object.getPrototypeOf(new Date())\n                || typeof value !== \"object\";\n      }\n\n    function ownKeys(value, ignoreObjectKeys) {\n        var props = [];\n        var protoKeys = [];\n        var keys, filteredObjectKeys;\n\n        value = value || {};\n\n        if (!isPrimitiveType(value)) {\n            protoKeys = Object.getOwnPropertyNames(Object.getPrototypeOf(value));\n        }\n\n        keys = Object.getOwnPropertyNames(value).concat(protoKeys);\n\n        filteredObjectKeys = objectKeys.filter(function(key) {\n            return keys.indexOf(key) < 0;\n        });\n\n        while (value) {\n            Object.getOwnPropertyNames(value).forEach(function(prop) {\n                if (props.indexOf(prop) === -1 && (!ignoreObjectKeys || filteredObjectKeys.indexOf(prop) < 0)) {\n                    props.push(prop);\n                }\n            });\n            value = Object.getPrototypeOf(value);\n        }\n\n        return props;\n    }\n\n    objectKeys = ownKeys({}, false);\n\n    var ObservableObject = Observable.extend({\n        init: function(value) {\n            var that = this,\n                member,\n                keys = ownKeys(value, true),\n                parent = function() {\n                    return that;\n                };\n\n            Observable.fn.init.call(this);\n\n            this._handlers = {};\n\n            keys.forEach(function(field) {\n                member = value[field];\n\n                if (typeof member === \"object\" && member && !member.getTime && field.charAt(0) != \"_\") {\n                    member = that.wrap(member, field, parent);\n                }\n\n                that[field] = member;\n            });\n\n            that.uid = kendo.guid();\n        },\n\n        shouldSerialize: function(field, serializeFunctions) {\n            return this.hasOwnProperty(field) && field !== \"_handlers\" && field !== \"_events\" && ((serializeFunctions && serializeFunctions[field]) || typeof this[field] !== FUNCTION) && field !== \"uid\";\n        },\n\n        forEach: function(f) {\n            for (var i in this) {\n                if (this.shouldSerialize(i)) {\n                    f(this[i], i);\n                }\n            }\n        },\n\n        toJSON: function(serializeFunctions) {\n            var result = {}, value, field;\n\n            for (field in this) {\n                if (this.shouldSerialize(field, serializeFunctions)) {\n                    value = this[field];\n\n                    if (value instanceof ObservableObject || value instanceof ObservableArray) {\n                        value = value.toJSON(serializeFunctions);\n                    }\n\n                    result[field] = value;\n                }\n            }\n\n            return result;\n        },\n\n        get: function(field) {\n            var that = this, result;\n\n            that.trigger(GET, { field: field });\n\n            if (field === \"this\") {\n                result = that;\n            } else {\n                result = kendo.getter(field, true)(that);\n            }\n\n            return result;\n        },\n\n        _set: function(field, value) {\n            var that = this;\n            var composite = field.indexOf(\".\") >= 0;\n\n            if (composite) {\n                var paths = field.split(\".\"),\n                    path = \"\";\n\n                while (paths.length > 1) {\n                    path += paths.shift();\n                    var obj = kendo.getter(path, true)(that);\n                    if (obj instanceof ObservableObject) {\n                        obj.set(paths.join(\".\"), value);\n                        return composite;\n                    }\n                    path += \".\";\n                }\n            }\n\n            kendo.setter(field)(that, value);\n\n            return composite;\n        },\n\n        set: function(field, value) {\n            var that = this,\n                isSetPrevented = false,\n                composite = field.indexOf(\".\") >= 0,\n                current = kendo.getter(field, true)(that);\n\n            if (current !== value) {\n                if (current instanceof Observable && this._handlers[field]) {\n                    if (this._handlers[field].get) {\n                       current.unbind(GET, this._handlers[field].get);\n                    }\n                    current.unbind(CHANGE, this._handlers[field].change);\n                }\n\n                isSetPrevented = that.trigger(\"set\", { field: field, value: value });\n\n                if (!isSetPrevented) {\n                    if (!composite) {\n                        value = that.wrap(value, field, function() { return that; });\n                    }\n                    if (!that._set(field, value) || field.indexOf(\"(\") >= 0 || field.indexOf(\"[\") >= 0) {\n                        that.trigger(CHANGE, { field: field });\n                    }\n                }\n            }\n\n            return isSetPrevented;\n        },\n\n        parent: noop,\n\n        wrap: function(object, field, parent) {\n            var that = this;\n            var get;\n            var change;\n            var type = toString.call(object);\n\n            if (object != null && (type === \"[object Object]\" || type === \"[object Array]\")) {\n                var isObservableArray = object instanceof ObservableArray;\n                var isDataSource = object instanceof DataSource;\n\n                if (type === \"[object Object]\" && !isDataSource && !isObservableArray) {\n                    if (!(object instanceof ObservableObject)) {\n                        object = new ObservableObject(object);\n                    }\n\n                    get = eventHandler(that, GET, field, true);\n                    object.bind(GET, get);\n                    change = eventHandler(that, CHANGE, field, true);\n                    object.bind(CHANGE, change);\n\n                    that._handlers[field] = { get: get, change: change };\n                } else if (type === \"[object Array]\" || isObservableArray || isDataSource) {\n                    if (!isObservableArray && !isDataSource) {\n                        object = new ObservableArray(object);\n                    }\n\n                    change = eventHandler(that, CHANGE, field, false);\n\n                    object.bind(CHANGE, change);\n\n                    that._handlers[field] = { change: change };\n                }\n\n                object.parent = parent;\n            }\n\n            return object;\n        }\n    });\n\n    function equal(x, y) {\n        if (x === y) {\n            return true;\n        }\n\n        var xtype = kendo.type(x), ytype = kendo.type(y), field;\n\n        if (xtype !== ytype) {\n            return false;\n        }\n\n        if (xtype === \"date\") {\n            return x.getTime() === y.getTime();\n        }\n\n        if (xtype !== \"object\" && xtype !== \"array\") {\n            return false;\n        }\n\n        for (field in x) {\n            if (!equal(x[field], y[field])) {\n                return false;\n            }\n        }\n\n        return true;\n    }\n\n    var parsers = {\n        \"number\": function(value) {\n            if (typeof value === STRING && value.toLowerCase() === \"null\") {\n                return null;\n            }\n            return kendo.parseFloat(value);\n        },\n\n        \"date\": function(value) {\n            if (typeof value === STRING && value.toLowerCase() === \"null\") {\n                return null;\n            }\n            return kendo.parseDate(value);\n        },\n\n        \"boolean\": function(value) {\n            if (typeof value === STRING) {\n                if (value.toLowerCase() === \"null\") {\n                    return null;\n                } else {\n                    return value.toLowerCase() === \"true\";\n                }\n            }\n            return value != null ? !!value : value;\n        },\n\n        \"string\": function(value) {\n            if (typeof value === STRING && value.toLowerCase() === \"null\") {\n                return null;\n            }\n            return value != null ? (value + \"\") : value;\n        },\n\n        \"default\": function(value) {\n            return value;\n        }\n    };\n\n    var defaultValues = {\n        \"string\": \"\",\n        \"number\": 0,\n        \"date\": new Date(),\n        \"boolean\": false,\n        \"default\": \"\"\n    };\n\n    function getFieldByName(obj, name) {\n        var field,\n            fieldName;\n\n        for (fieldName in obj) {\n            field = obj[fieldName];\n            if (isPlainObject(field) && field.field && field.field === name) {\n                return field;\n            } else if (field === name) {\n                return field;\n            }\n        }\n        return null;\n    }\n\n    var Model = ObservableObject.extend({\n        init: function(data) {\n            var that = this;\n\n            if (!data || $.isEmptyObject(data)) {\n                data = $.extend({}, that.defaults, data);\n\n                if (that._initializers) {\n                    for (var idx = 0; idx < that._initializers.length; idx++) {\n                         var name = that._initializers[idx];\n                         data[name] = that.defaults[name]();\n                    }\n                }\n            }\n\n            ObservableObject.fn.init.call(that, data);\n\n            that.dirty = false;\n            that.dirtyFields = {};\n\n            if (that.idField) {\n                that.id = that.get(that.idField);\n\n                if (that.id === undefined) {\n                    that.id = that._defaultId;\n                }\n            }\n        },\n\n        shouldSerialize: function(field) {\n            return ObservableObject.fn.shouldSerialize.call(this, field) &&\n                field !== \"uid\" && !(this.idField !== \"id\" && field === \"id\") &&\n                field !== \"dirty\" && field !== \"dirtyFields\" && field !== \"_accessors\";\n        },\n\n        _parse: function(field, value) {\n            var that = this,\n                fieldName = field,\n                fields = (that.fields || {}),\n                parse;\n\n            field = fields[field];\n            if (!field) {\n                field = getFieldByName(fields, fieldName);\n            }\n            if (field) {\n                parse = field.parse;\n                if (!parse && field.type) {\n                    parse = parsers[field.type.toLowerCase()];\n                }\n            }\n\n            return parse ? parse(value) : value;\n        },\n\n        _notifyChange: function(e) {\n            var action = e.action;\n\n            if (action == \"add\" || action == \"remove\") {\n                this.dirty = true;\n                this.dirtyFields[e.field] = true;\n            }\n        },\n\n        editable: function(field) {\n            field = (this.fields || {})[field];\n            return field ? field.editable !== false : true;\n        },\n\n        set: function(field, value) {\n            var that = this;\n            var dirty = that.dirty;\n\n            if (that.editable(field)) {\n                value = that._parse(field, value);\n\n                if (!equal(value, that.get(field))) {\n                    that.dirty = true;\n                    that.dirtyFields[field] = true;\n\n                    if (ObservableObject.fn.set.call(that, field, value) && !dirty) {\n                        that.dirty = dirty;\n\n                        if (!that.dirty) {\n                            that.dirtyFields[field] = false;\n                        }\n                    }\n                } else {\n                    that.trigger(\"equalSet\", { field: field, value: value });\n                }\n            }\n        },\n\n        accept: function(data) {\n            var that = this,\n                parent = function() { return that; },\n                field;\n\n            for (field in data) {\n                var value = data[field];\n\n                if (field.charAt(0) != \"_\") {\n                    value = that.wrap(data[field], field, parent);\n                }\n\n                that._set(field, value);\n            }\n\n            if (that.idField) {\n                that.id = that.get(that.idField);\n            }\n\n            that.dirty = false;\n            that.dirtyFields = {};\n        },\n\n        isNew: function() {\n            return this.id === this._defaultId;\n        }\n    });\n\n    Model.define = function(base, options) {\n        if (options === undefined) {\n            options = base;\n            base = Model;\n        }\n\n        var model,\n            proto = extend({ defaults: {} }, options),\n            name,\n            field,\n            type,\n            value,\n            idx,\n            length,\n            fields = {},\n            originalName,\n            id = proto.id,\n            functionFields = [];\n\n        if (id) {\n            proto.idField = id;\n        }\n\n        if (proto.id) {\n            delete proto.id;\n        }\n\n        if (id) {\n            proto.defaults[id] = proto._defaultId = \"\";\n        }\n\n        if (toString.call(proto.fields) === \"[object Array]\") {\n            for (idx = 0, length = proto.fields.length; idx < length; idx++) {\n                field = proto.fields[idx];\n                if (typeof field === STRING) {\n                    fields[field] = {};\n                } else if (field.field) {\n                    fields[field.field] = field;\n                }\n            }\n            proto.fields = fields;\n        }\n\n        for (name in proto.fields) {\n            field = proto.fields[name];\n            type = field.type || \"default\";\n            value = null;\n            originalName = name;\n\n            name = typeof (field.field) === STRING ? field.field : name;\n\n            if (!field.nullable) {\n                value = proto.defaults[originalName !== name ? originalName : name] = field.defaultValue !== undefined ? field.defaultValue : defaultValues[type.toLowerCase()];\n\n                if (typeof value === \"function\") {\n                    functionFields.push(name);\n                }\n            }\n\n            if (options.id === name) {\n                proto._defaultId = value;\n            }\n\n            proto.defaults[originalName !== name ? originalName : name] = value;\n\n            field.parse = field.parse || parsers[type];\n        }\n\n        if (functionFields.length > 0) {\n            proto._initializers = functionFields;\n        }\n\n        model = base.extend(proto);\n        model.define = function(options) {\n            return Model.define(model, options);\n        };\n\n        if (proto.fields) {\n            model.fields = proto.fields;\n            model.idField = proto.idField;\n        }\n\n        return model;\n    };\n\n    var Comparer = {\n        selector: function(field) {\n            return isFunction(field) ? field : getter(field);\n        },\n\n        compare: function(field) {\n            var selector = this.selector(field);\n            return function(a, b) {\n                a = selector(a);\n                b = selector(b);\n\n                if (a == null && b == null) {\n                    return 0;\n                }\n\n                if (a == null) {\n                    return -1;\n                }\n\n                if (b == null) {\n                    return 1;\n                }\n\n                if (a.localeCompare) {\n                    return a.localeCompare(b);\n                }\n\n                return a > b ? 1 : (a < b ? -1 : 0);\n            };\n        },\n\n        create: function(sort) {\n            var compare = sort.compare || this.compare(sort.field);\n\n            if (sort.dir == \"desc\") {\n                return function(a, b) {\n                    return compare(b, a, true);\n                };\n            }\n\n            return compare;\n        },\n\n        combine: function(comparers) {\n            return function(a, b) {\n                var result = comparers[0](a, b),\n                    idx,\n                    length;\n\n                for (idx = 1, length = comparers.length; idx < length; idx ++) {\n                    result = result || comparers[idx](a, b);\n                }\n\n                return result;\n            };\n        }\n    };\n\n    var StableComparer = extend({}, Comparer, {\n        asc: function(field) {\n            var selector = this.selector(field);\n            return function(a, b) {\n                var valueA = selector(a);\n                var valueB = selector(b);\n\n                if (valueA && valueA.getTime && valueB && valueB.getTime) {\n                    valueA = valueA.getTime();\n                    valueB = valueB.getTime();\n                }\n\n                if (valueA === valueB) {\n                    return a.__position - b.__position;\n                }\n\n                if (valueA == null) {\n                    return -1;\n                }\n\n                if (valueB == null) {\n                    return 1;\n                }\n\n                if (valueA.localeCompare) {\n                    return valueA.localeCompare(valueB);\n                }\n\n                return valueA > valueB ? 1 : -1;\n            };\n        },\n\n        desc: function(field) {\n            var selector = this.selector(field);\n            return function(a, b) {\n                var valueA = selector(a);\n                var valueB = selector(b);\n\n                if (valueA && valueA.getTime && valueB && valueB.getTime) {\n                    valueA = valueA.getTime();\n                    valueB = valueB.getTime();\n                }\n\n                if (valueA === valueB) {\n                    return a.__position - b.__position;\n                }\n\n                if (valueA == null) {\n                    return 1;\n                }\n\n                if (valueB == null) {\n                    return -1;\n                }\n\n                if (valueB.localeCompare) {\n                    return valueB.localeCompare(valueA);\n                }\n\n                return valueA < valueB ? 1 : -1;\n            };\n        },\n        create: function(sort) {\n           return this[sort.dir](sort.field);\n        }\n    });\n\n    map = function(array, callback) {\n        var idx, length = array.length, result = new Array(length);\n\n        for (idx = 0; idx < length; idx++) {\n            result[idx] = callback(array[idx], idx, array);\n        }\n\n        return result;\n    };\n\n    var operators = (function() {\n\n        function quote(str) {\n            if (typeof str == \"string\") {\n                str = str.replace(/[\\r\\n]+/g, \"\");\n            }\n            return JSON.stringify(str);\n        }\n\n        function textOp(impl) {\n            return function(a, b, ignore, accentFoldingFiltering) {\n                b += \"\";\n                if (ignore) {\n                    a = \"(\" + a + \" + '').toString()\" + ((accentFoldingFiltering) ? \".toLocaleLowerCase('\" + accentFoldingFiltering + \"')\" : \".toLowerCase()\");\n                    b = ((accentFoldingFiltering) ? b.toLocaleLowerCase(accentFoldingFiltering) : b.toLowerCase());\n                }\n                return impl(a, quote(b), ignore);\n            };\n        }\n\n        function operator(op, a, b, ignore, accentFoldingFiltering) {\n            if (b != null) {\n                if (typeof b === STRING) {\n                    var date = dateRegExp.exec(b);\n                    if (date) {\n                        b = new Date(+date[1]);\n                    } else if (ignore) {\n                        b = quote(((accentFoldingFiltering) ? b.toLocaleLowerCase(accentFoldingFiltering) : b.toLowerCase()));\n                        a = \"((\" + a + \" || '')+'')\" + ((accentFoldingFiltering) ? \".toLocaleLowerCase('\" + accentFoldingFiltering + \"')\" : \".toLowerCase()\");\n                    } else {\n                        b = quote(b);\n                    }\n                }\n\n                if (b.getTime) {\n                    //b looks like a Date\n                    a = \"(\" + a + \"&&\" + a + \".getTime?\" + a + \".getTime():\" + a + \")\";\n                    b = b.getTime();\n                }\n            }\n\n            return a + \" \" + op + \" \" + b;\n        }\n\n        function getMatchRegexp(pattern) {\n            // take a pattern, as supported by Excel match filter, and\n            // convert it to the equivalent JS regular expression.\n            // Excel patterns support:\n            //\n            //   * - match any sequence of characters\n            //   ? - match a single character\n            //\n            // to match a literal * or ?, they must be prefixed by a tilde (~)\n            for (var rx = \"/^\", esc = false, i = 0; i < pattern.length; ++i) {\n                var ch = pattern.charAt(i);\n                if (esc) {\n                    rx += \"\\\\\" + ch;\n                } else if (ch == \"~\") {\n                    esc = true;\n                    continue;\n                } else if (ch == \"*\") {\n                    rx += \".*\";\n                } else if (ch == \"?\") {\n                    rx += \".\";\n                } else if (\".+^$()[]{}|\\\\/\\n\\r\\u2028\\u2029\\xA0\".indexOf(ch) >= 0) {\n                    rx += \"\\\\\" + ch;\n                } else {\n                    rx += ch;\n                }\n                esc = false;\n            }\n            return rx + \"$/\";\n        }\n\n        return {\n            quote: function(value) {\n                if (value && value.getTime) {\n                    return \"new Date(\" + value.getTime() + \")\";\n                }\n                return quote(value);\n            },\n            eq: function(a, b, ignore, accentFoldingFiltering) {\n                return operator(\"==\", a, b, ignore, accentFoldingFiltering);\n            },\n            neq: function(a, b, ignore, accentFoldingFiltering) {\n                return operator(\"!=\", a, b, ignore, accentFoldingFiltering);\n            },\n            gt: function(a, b, ignore) {\n                return operator(\">\", a, b, ignore);\n            },\n            gte: function(a, b, ignore) {\n                return operator(\">=\", a, b, ignore);\n            },\n            lt: function(a, b, ignore) {\n                return operator(\"<\", a, b, ignore);\n            },\n            lte: function(a, b, ignore) {\n                return operator(\"<=\", a, b, ignore);\n            },\n            startswith: textOp(function(a, b) {\n                return a + \".lastIndexOf(\" + b + \", 0) == 0\";\n            }),\n            doesnotstartwith: textOp(function(a, b) {\n                return a + \".lastIndexOf(\" + b + \", 0) == -1\";\n            }),\n            endswith: textOp(function(a, b) {\n                var n = b ? b.length - 2 : 0;\n                return a + \".indexOf(\" + b + \", \" + a + \".length - \" + n + \") >= 0\";\n            }),\n            doesnotendwith: textOp(function(a, b) {\n                var n = b ? b.length - 2 : 0;\n                return a + \".indexOf(\" + b + \", \" + a + \".length - \" + n + \") < 0\";\n            }),\n            contains: textOp(function(a, b) {\n                return a + \".indexOf(\" + b + \") >= 0\";\n            }),\n            doesnotcontain: textOp(function(a, b) {\n                return a + \".indexOf(\" + b + \") == -1\";\n            }),\n            matches: textOp(function(a, b) {\n                b = b.substring(1, b.length - 1);\n                return getMatchRegexp(b) + \".test(\" + a + \")\";\n            }),\n            doesnotmatch: textOp(function(a, b) {\n                b = b.substring(1, b.length - 1);\n                return \"!\" + getMatchRegexp(b) + \".test(\" + a + \")\";\n            }),\n            isempty: function(a) {\n                return a + \" === ''\";\n            },\n            isnotempty: function(a) {\n                return a + \" !== ''\";\n            },\n            isnull: function(a) {\n                return \"(\" + a + \" == null)\";\n            },\n            isnotnull: function(a) {\n                return \"(\" + a + \" != null)\";\n            },\n            isnullorempty: function(a) {\n                return \"(\" + a + \" === null) || (\" + a + \" === '')\";\n            },\n            isnotnullorempty: function(a) {\n                return \"(\" + a + \" !== null) && (\" + a + \" !== '')\";\n            }\n        };\n    })();\n\n    function Query(data) {\n        this.data = data || [];\n    }\n\n    Query.filterExpr = function(expression) {\n        var expressions = [],\n            logic = { and: \" && \", or: \" || \" },\n            idx,\n            length,\n            filter,\n            expr,\n            fieldFunctions = [],\n            operatorFunctions = [],\n            field,\n            operator,\n            filters = expression.filters;\n\n        for (idx = 0, length = filters.length; idx < length; idx++) {\n            filter = filters[idx];\n            field = filter.field;\n            operator = filter.operator;\n\n            if (filter.filters) {\n                expr = Query.filterExpr(filter);\n                //Nested function fields or operators - update their index e.g. __o[0] -> __o[1]\n                filter = expr.expression\n                .replace(/__o\\[(\\d+)\\]/g, function(match, index) {\n                    index = +index;\n                    return \"__o[\" + (operatorFunctions.length + index) + \"]\";\n                })\n                .replace(/__f\\[(\\d+)\\]/g, function(match, index) {\n                    index = +index;\n                    return \"__f[\" + (fieldFunctions.length + index) + \"]\";\n                });\n\n                operatorFunctions.push.apply(operatorFunctions, expr.operators);\n                fieldFunctions.push.apply(fieldFunctions, expr.fields);\n            } else {\n                if (typeof field === FUNCTION) {\n                    expr = \"__f[\" + fieldFunctions.length + \"](d)\";\n                    fieldFunctions.push(field);\n                } else {\n                    expr = kendo.expr(field);\n                }\n\n                if (typeof operator === FUNCTION) {\n                    filter = \"__o[\" + operatorFunctions.length + \"](\" + expr + \", \" + operators.quote(filter.value) + \")\";\n                    operatorFunctions.push(operator);\n                } else {\n                    filter = operators[(operator || \"eq\").toLowerCase()](expr, filter.value, filter.ignoreCase !== undefined ? filter.ignoreCase : true, expression.accentFoldingFiltering);\n                }\n            }\n\n            expressions.push(filter);\n        }\n\n        return { expression: \"(\" + expressions.join(logic[expression.logic]) + \")\", fields: fieldFunctions, operators: operatorFunctions };\n    };\n\n    function normalizeSort(field, dir) {\n        if (field) {\n            var descriptor = typeof field === STRING ? { field: field, dir: dir } : field,\n            descriptors = isArray(descriptor) ? descriptor : (descriptor !== undefined ? [descriptor] : []);\n\n            return grep(descriptors, function(d) { return !!d.dir; });\n        }\n    }\n\n    function sortFields(sorts, dir) {\n        var sortObject = {};\n\n        if (sorts) {\n            var descriptor = typeof sorts === STRING ? { field: sorts, dir: dir } : sorts,\n            descriptors = isArray(descriptor) ? descriptor : (descriptor !== undefined ? [descriptor] : []);\n\n            for (var i = 0; i < descriptors.length; i++) {\n                sortObject[descriptors[i].field] = { dir: descriptors[i].dir, index: i + 1 };\n            }\n        }\n\n        return sortObject;\n    }\n\n    var operatorMap = {\n        \"==\": \"eq\",\n        equals: \"eq\",\n        isequalto: \"eq\",\n        equalto: \"eq\",\n        equal: \"eq\",\n        \"!=\": \"neq\",\n        ne: \"neq\",\n        notequals: \"neq\",\n        isnotequalto: \"neq\",\n        notequalto: \"neq\",\n        notequal: \"neq\",\n        \"<\": \"lt\",\n        islessthan: \"lt\",\n        lessthan: \"lt\",\n        less: \"lt\",\n        \"<=\": \"lte\",\n        le: \"lte\",\n        islessthanorequalto: \"lte\",\n        lessthanequal: \"lte\",\n        \">\": \"gt\",\n        isgreaterthan: \"gt\",\n        greaterthan: \"gt\",\n        greater: \"gt\",\n        \">=\": \"gte\",\n        isgreaterthanorequalto: \"gte\",\n        greaterthanequal: \"gte\",\n        ge: \"gte\",\n        notsubstringof: \"doesnotcontain\",\n        isnull: \"isnull\",\n        isempty: \"isempty\",\n        isnotempty: \"isnotempty\"\n    };\n\n    function normalizeOperator(expression) {\n        var idx,\n        length,\n        filter,\n        operator,\n        filters = expression.filters;\n\n        if (filters) {\n            for (idx = 0, length = filters.length; idx < length; idx++) {\n                filter = filters[idx];\n                operator = filter.operator;\n\n                if (operator && typeof operator === STRING) {\n                    filter.operator = operatorMap[operator.toLowerCase()] || operator;\n                }\n\n                normalizeOperator(filter);\n            }\n        }\n    }\n\n    function normalizeFilter(expression) {\n        if (expression && !isEmptyObject(expression)) {\n            if (isArray(expression) || !expression.filters) {\n                expression = {\n                    logic: \"and\",\n                    filters: isArray(expression) ? expression : [expression]\n                };\n            }\n\n            normalizeOperator(expression);\n\n            return expression;\n        }\n    }\n\n    Query.normalizeFilter = normalizeFilter;\n\n    function compareDescriptor(f1, f2) {\n        if (f1.logic || f2.logic) {\n            return false;\n        }\n\n        return f1.field === f2.field && f1.value === f2.value && f1.operator === f2.operator;\n    }\n\n    function normalizeDescriptor(filter) {\n        filter = filter || {};\n\n        if (isEmptyObject(filter)) {\n            return { logic: \"and\", filters: [] };\n        }\n\n        return normalizeFilter(filter);\n    }\n\n    function fieldComparer(a, b) {\n        if (b.logic || (a.field > b.field)) {\n            return 1;\n        } else if (a.field < b.field) {\n            return -1;\n        } else {\n            return 0;\n        }\n    }\n\n    function compareFilters(expr1, expr2) {\n        expr1 = normalizeDescriptor(expr1);\n        expr2 = normalizeDescriptor(expr2);\n\n        if (expr1.logic !== expr2.logic) {\n            return false;\n        }\n\n        var f1, f2;\n        var filters1 = (expr1.filters || []).slice();\n        var filters2 = (expr2.filters || []).slice();\n\n        if (filters1.length !== filters2.length) {\n            return false;\n        }\n\n        filters1 = filters1.sort(fieldComparer);\n        filters2 = filters2.sort(fieldComparer);\n\n        for (var idx = 0; idx < filters1.length; idx++) {\n            f1 = filters1[idx];\n            f2 = filters2[idx];\n\n            if (f1.logic && f2.logic) {\n                if (!compareFilters(f1, f2)) {\n                    return false;\n                }\n            } else if (!compareDescriptor(f1, f2)) {\n                return false;\n            }\n        }\n\n        return true;\n    }\n\n    Query.compareFilters = compareFilters;\n\n    function normalizeAggregate(expressions) {\n        return isArray(expressions) ? expressions : [expressions];\n    }\n\n    function normalizeGroup(field, dir, compare, skipItemSorting) {\n        var descriptor = typeof field === STRING ? { field: field, dir: dir, compare: compare, skipItemSorting: skipItemSorting } : field,\n        descriptors = isArray(descriptor) ? descriptor : (descriptor !== undefined ? [descriptor] : []);\n\n        return map(descriptors, function(d) {\n            return {\n                field: d.field,\n                dir: d.dir || \"asc\",\n                aggregates: d.aggregates,\n                compare: d.compare,\n                skipItemSorting: d.skipItemSorting\n            };\n        });\n    }\n\n    function normalizeGroupWithoutCompare(field, dir, compare) {\n        var descriptors = normalizeGroup(field, dir, compare);\n\n        for (var i = 0; i < descriptors.length; i++) {\n            delete descriptors[i].compare;\n        }\n\n        return descriptors;\n    }\n\n    function anyGroupDescriptorHasCompare(groupDescriptors) {\n        var descriptors = isArray(groupDescriptors) ? groupDescriptors : [groupDescriptors];\n\n        for (var i = 0; i < descriptors.length; i++) {\n            if (descriptors[i] && isFunction(descriptors[i].compare)) {\n                return true;\n            }\n        }\n\n        return false;\n    }\n\n    Query.prototype = {\n        toArray: function() {\n            return this.data;\n        },\n        range: function(index, count) {\n            return new Query(this.data.slice(index, index + count));\n        },\n        skip: function(count) {\n            return new Query(this.data.slice(count));\n        },\n        take: function(count) {\n            return new Query(this.data.slice(0, count));\n        },\n        select: function(selector) {\n            return new Query(map(this.data, selector));\n        },\n        order: function(selector, dir, inPlace) {\n            var sort = { dir: dir };\n\n            if (selector) {\n                if (selector.compare) {\n                    sort.compare = selector.compare;\n                } else {\n                    sort.field = selector;\n                }\n            }\n\n            if (inPlace) {\n                return new Query(this.data.sort(Comparer.create(sort)));\n            }\n\n            return new Query(this.data.slice(0).sort(Comparer.create(sort)));\n        },\n        orderBy: function(selector, inPlace) {\n            return this.order(selector, \"asc\", inPlace);\n        },\n        orderByDescending: function(selector, inPlace) {\n            return this.order(selector, \"desc\", inPlace);\n        },\n        sort: function(field, dir, comparer, inPlace) {\n            var idx,\n            length,\n            descriptors = normalizeSort(field, dir),\n            comparers = [];\n\n            comparer = comparer || Comparer;\n\n            if (descriptors.length) {\n                for (idx = 0, length = descriptors.length; idx < length; idx++) {\n                    comparers.push(comparer.create(descriptors[idx]));\n                }\n\n                return this.orderBy({ compare: comparer.combine(comparers) }, inPlace);\n            }\n\n            return this;\n        },\n\n        filter: function(expressions) {\n            var idx,\n            current,\n            length,\n            compiled,\n            predicate,\n            data = this.data,\n            fields,\n            operators,\n            result = [],\n            filter;\n\n            expressions = normalizeFilter(expressions);\n\n            if (!expressions || expressions.filters.length === 0) {\n                return this;\n            }\n\n            compiled = Query.filterExpr(expressions);\n            fields = compiled.fields;\n            operators = compiled.operators;\n\n            predicate = filter = new Function(\"d, __f, __o\", \"return \" + compiled.expression);\n\n            if (fields.length || operators.length) {\n                filter = function(d) {\n                    return predicate(d, fields, operators);\n                };\n            }\n\n\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                current = data[idx];\n\n                if (filter(current)) {\n                    result.push(current);\n                }\n            }\n\n            return new Query(result);\n        },\n\n        group: function(descriptors, allData, options) {\n            descriptors = normalizeGroup(descriptors || []);\n            allData = allData || this.data;\n\n            var that = this,\n            result = new Query(that.data),\n            descriptor;\n\n            if (descriptors.length > 0) {\n                descriptor = descriptors[0];\n\n                if (options && options.groupPaging) {\n                    result = new Query(allData).groupAllData(descriptor, allData).select(function(group) {\n                        var data = new Query(allData).filter([{\n                            field: group.field,\n                            operator: \"eq\",\n                            value: group.value,\n                            ignoreCase: false\n                        }]);\n                        var items = descriptors.length > 1 ? new Query(group.items).group(descriptors.slice(1), data.toArray(), options).toArray() : group.items;\n                        return {\n                            field: group.field,\n                            value: group.value,\n                            hasSubgroups: descriptors.length > 1,\n                            items: items,\n                            aggregates: data.aggregate(descriptor.aggregates),\n                            uid: kendo.guid(),\n                            itemCount: items.length,\n                            subgroupCount: items.length\n                        };\n                    });\n\n                } else {\n                    result = result.groupBy(descriptor).select(function(group) {\n                        var data = new Query(allData).filter([ { field: group.field, operator: \"eq\", value: group.value, ignoreCase: false } ]);\n                        return {\n                            field: group.field,\n                            value: group.value,\n                            items: descriptors.length > 1 ? new Query(group.items).group(descriptors.slice(1), data.toArray()).toArray() : group.items,\n                            hasSubgroups: descriptors.length > 1,\n                            aggregates: data.aggregate(descriptor.aggregates)\n                        };\n                    });\n                }\n            }\n            return result;\n        },\n\n        groupBy: function(descriptor) {\n            var that = this;\n\n            if (isEmptyObject(descriptor) || !this.data.length) {\n                return new Query([]);\n            }\n\n            var field = descriptor.field,\n                sorted = descriptor.skipItemSorting ? this.data : this._sortForGrouping(field, descriptor.dir || \"asc\"),\n                accessor = kendo.accessor(field),\n                item,\n                groupValue = accessor.get(sorted[0], field),\n                group = {\n                    field: field,\n                    value: groupValue,\n                    items: []\n                },\n                currentValue,\n                idx,\n                len,\n                result = [group];\n\n            for (idx = 0, len = sorted.length; idx < len; idx++) {\n                item = sorted[idx];\n                currentValue = accessor.get(item, field);\n                if (!groupValueComparer(groupValue, currentValue)) {\n                    groupValue = currentValue;\n                    group = {\n                        field: field,\n                        value: groupValue,\n                        items: []\n                    };\n                    result.push(group);\n                }\n                group.items.push(item);\n            }\n\n            result = that._sortGroups(result, descriptor);\n\n            return new Query(result);\n        },\n\n        groupAllData: function(descriptor, allData) {\n            if (isEmptyObject(descriptor) || this.data && !this.data.length) {\n                return new Query([]);\n            }\n\n            var field = descriptor.field,\n                sorted = descriptor.skipItemSorting ? allData : new Query(allData).sort(field, descriptor.dir || \"asc\", StableComparer).toArray(),\n                accessor = kendo.accessor(field),\n                item,\n                groupValue = accessor.get(sorted[0], field),\n                group = {\n                    field: field,\n                    value: groupValue,\n                    items: []\n                },\n                currentValue,\n                idx,\n                len,\n                result = [group];\n\n            for (idx = 0, len = sorted.length; idx < len; idx++) {\n                item = sorted[idx];\n                currentValue = accessor.get(item, field);\n                if (!groupValueComparer(groupValue, currentValue)) {\n                    groupValue = currentValue;\n                    group = {\n                        field: field,\n                        value: groupValue,\n                        items: []\n                    };\n                    result.push(group);\n                }\n                group.items.push(item);\n            }\n\n            result = this._sortGroups(result, descriptor);\n\n            return new Query(result);\n        },\n\n        _sortForGrouping: function(field, dir) {\n            var idx, length,\n                data = this.data;\n\n            if (!stableSort) {\n                for (idx = 0, length = data.length; idx < length; idx++) {\n                    data[idx].__position = idx;\n                }\n\n                data = new Query(data).sort(field, dir, StableComparer).toArray();\n\n                for (idx = 0, length = data.length; idx < length; idx++) {\n                    delete data[idx].__position;\n                }\n                return data;\n            }\n\n            return this.sort(field, dir).toArray();\n        },\n\n        _sortGroups: function(groups, descriptor) {\n            var result = groups;\n\n            if (descriptor && isFunction(descriptor.compare)) {\n                result = new Query(result).order({ compare: descriptor.compare }, descriptor.dir || ASCENDING).toArray();\n            }\n\n            return result;\n        },\n\n        aggregate: function(aggregates) {\n            var idx,\n                len,\n                result = {},\n                state = {};\n\n            if (aggregates && aggregates.length) {\n                for (idx = 0, len = this.data.length; idx < len; idx++) {\n                    calculateAggregate(result, aggregates, this.data[idx], idx, len, state);\n                }\n            }\n            return result;\n        }\n    };\n\n    function groupValueComparer(a, b) {\n        if (a && a.getTime && b && b.getTime) {\n            return a.getTime() === b.getTime();\n        }\n        return a === b;\n    }\n\n    function calculateAggregate(accumulator, aggregates, item, index, length, state) {\n        aggregates = aggregates || [];\n        var idx,\n            aggr,\n            functionName,\n            len = aggregates.length;\n\n        for (idx = 0; idx < len; idx++) {\n            aggr = aggregates[idx];\n            functionName = aggr.aggregate;\n            var field = aggr.field;\n            accumulator[field] = accumulator[field] || {};\n            state[field] = state[field] || {};\n            state[field][functionName] = state[field][functionName] || {};\n            accumulator[field][functionName] = functions[functionName.toLowerCase()](accumulator[field][functionName], item, kendo.accessor(field), index, length, state[field][functionName]);\n        }\n    }\n\n    var functions = {\n        sum: function(accumulator, item, accessor) {\n            var value = accessor.get(item);\n\n            if (!isNumber(accumulator)) {\n                accumulator = value;\n            } else if (isNumber(value)) {\n                accumulator += value;\n            }\n\n            return accumulator;\n        },\n        count: function(accumulator) {\n            return (accumulator || 0) + 1;\n        },\n        average: function(accumulator, item, accessor, index, length, state) {\n            var value = accessor.get(item);\n\n            if (state.count === undefined) {\n                state.count = 0;\n            }\n\n            if (!isNumber(accumulator)) {\n                accumulator = value;\n            } else if (isNumber(value)) {\n                accumulator += value;\n            }\n\n            if (isNumber(value)) {\n                state.count++;\n            }\n\n            if (index == length - 1 && isNumber(accumulator)) {\n                accumulator = accumulator / state.count;\n            }\n            return accumulator;\n        },\n        max: function(accumulator, item, accessor) {\n            var value = accessor.get(item);\n\n            if (!isNumber(accumulator) && !isDate(accumulator)) {\n                accumulator = value;\n            }\n\n            if (accumulator < value && (isNumber(value) || isDate(value))) {\n                accumulator = value;\n            }\n            return accumulator;\n        },\n        min: function(accumulator, item, accessor) {\n            var value = accessor.get(item);\n\n            if (!isNumber(accumulator) && !isDate(accumulator)) {\n                accumulator = value;\n            }\n\n            if (accumulator > value && (isNumber(value) || isDate(value))) {\n                accumulator = value;\n            }\n            return accumulator;\n        }\n    };\n\n    function isNumber(val) {\n        return typeof val === \"number\" && !isNaN(val);\n    }\n\n    function isDate(val) {\n        return val && val.getTime;\n    }\n\n    function toJSON(array) {\n        var idx, length = array.length, result = new Array(length);\n\n        for (idx = 0; idx < length; idx++) {\n            result[idx] = array[idx].toJSON();\n        }\n\n        return result;\n    }\n\n    Query.normalizeGroup = normalizeGroup;\n    Query.normalizeSort = normalizeSort;\n\n    Query.process = function(data, options, inPlace) {\n        options = options || {};\n\n        var group = options.group;\n        var customGroupSort = anyGroupDescriptorHasCompare(normalizeGroup(group || []));\n        var query = new Query(data),\n            groupDescriptorsWithoutCompare = normalizeGroupWithoutCompare(group || []),\n            normalizedSort = normalizeSort(options.sort || []),\n            sort = customGroupSort ? normalizedSort : groupDescriptorsWithoutCompare.concat(normalizedSort),\n            groupDescriptorsWithoutSort,\n            total,\n            filterCallback = options.filterCallback,\n            filter = options.filter,\n            skip = options.skip,\n            take = options.take;\n\n        if (sort && inPlace) {\n            query = query.sort(sort, undefined, undefined, inPlace);\n        }\n\n        if (filter) {\n            query = query.filter(filter);\n\n            if (filterCallback) {\n                query = filterCallback(query);\n            }\n\n            total = query.toArray().length;\n        }\n\n        if (sort) {\n            if (!inPlace) {\n                query = query.sort(sort);\n            }\n\n            if (group) {\n                data = query.toArray();\n            }\n        }\n\n        if (customGroupSort) {\n            query = query.group(group, data, options);\n\n            if (skip !== undefined && take !== undefined && !options.groupPaging) {\n                query = new Query(flatGroups(query.toArray())).range(skip, take);\n\n                groupDescriptorsWithoutSort = map(groupDescriptorsWithoutCompare, function(groupDescriptor) {\n                    return extend({}, groupDescriptor, {\n                        skipItemSorting: true\n                    });\n                });\n\n                query = query.group(groupDescriptorsWithoutSort, data, options);\n            }\n        } else {\n            if (skip !== undefined && take !== undefined) {\n                total = query.data.length;\n\n                if (skip + take > total && options.virtual) {\n                    skip -= skip + take - total;\n                    skip = skip < 0 ? 0 : skip;\n                }\n                query = query.range(skip, take);\n            }\n\n            if (group && (!isEmptyObject(group) || group.length !== 0)) {\n                query = query.group(group, data, options);\n            }\n        }\n\n        return {\n            total: total,\n            data: query.toArray()\n        };\n    };\n\n    var LocalTransport = Class.extend({\n        init: function(options) {\n            this.data = options.data;\n        },\n\n        read: function(options) {\n            options.success(this.data);\n        },\n        update: function(options) {\n            options.success(options.data);\n        },\n        create: function(options) {\n            options.success(options.data);\n        },\n        destroy: function(options) {\n            options.success(options.data);\n        }\n    });\n\n    var RemoteTransport = Class.extend( {\n        init: function(options) {\n            var that = this, parameterMap;\n\n            options = that.options = extend({}, that.options, options);\n\n            each(crud, function(index, type) {\n                if (typeof options[type] === STRING) {\n                    options[type] = {\n                        url: options[type]\n                    };\n                }\n            });\n\n            that.cache = options.cache ? Cache.create(options.cache) : {\n                find: noop,\n                add: noop\n            };\n\n            parameterMap = options.parameterMap;\n\n            if (options.submit) {\n                that.submit = options.submit;\n            }\n\n            if (isFunction(options.push)) {\n                that.push = options.push;\n            }\n\n            if (!that.push) {\n                that.push = identity;\n            }\n\n            that.parameterMap = isFunction(parameterMap) ? parameterMap : function(options) {\n                var result = {};\n\n                each(options, function(option, value) {\n                    if (option in parameterMap) {\n                        option = parameterMap[option];\n                        if (isPlainObject(option)) {\n                            value = option.value(value);\n                            option = option.key;\n                        }\n                    }\n\n                    result[option] = value;\n                });\n\n                return result;\n            };\n        },\n\n        options: {\n            parameterMap: identity\n        },\n\n        create: function(options) {\n            return ajax(this.setup(options, CREATE));\n        },\n\n        read: function(options) {\n            var that = this,\n                success,\n                error,\n                result,\n                cache = that.cache;\n\n            options = that.setup(options, READ);\n\n            success = options.success || noop;\n            error = options.error || noop;\n\n            result = cache.find(options.data);\n\n            if (result !== undefined) {\n                success(result);\n            } else {\n                options.success = function(result) {\n                    cache.add(options.data, result);\n\n                    success(result);\n                };\n\n                $.ajax(options);\n            }\n        },\n\n        update: function(options) {\n            return ajax(this.setup(options, UPDATE));\n        },\n\n        destroy: function(options) {\n            return ajax(this.setup(options, DESTROY));\n        },\n\n        setup: function(options, type) {\n            options = options || {};\n\n            var that = this,\n                parameters,\n                operation = that.options[type],\n                data = isFunction(operation.data) ? operation.data(options.data) : operation.data;\n\n            options = extend(true, {}, operation, options);\n            parameters = extend(true, {}, data, options.data);\n\n            options.data = that.parameterMap(parameters, type);\n\n            if (isFunction(options.url)) {\n                options.url = options.url(parameters);\n            }\n\n            return options;\n        }\n    });\n\n    var Cache = Class.extend({\n        init: function() {\n            this._store = {};\n        },\n        add: function(key, data) {\n            if (key !== undefined) {\n                this._store[stringify(key)] = data;\n            }\n        },\n        find: function(key) {\n            return this._store[stringify(key)];\n        },\n        clear: function() {\n            this._store = {};\n        },\n        remove: function(key) {\n            delete this._store[stringify(key)];\n        }\n    });\n\n    Cache.create = function(options) {\n        var store = {\n            \"inmemory\": function() { return new Cache(); }\n        };\n\n        if (isPlainObject(options) && isFunction(options.find)) {\n            return options;\n        }\n\n        if (options === true) {\n            return new Cache();\n        }\n\n        return store[options]();\n    };\n\n    function serializeRecords(data, getters, modelInstance, originalFieldNames, fieldNames) {\n        var record,\n            getter,\n            originalName,\n            idx,\n            setters = {},\n            length;\n\n        for (idx = 0, length = data.length; idx < length; idx++) {\n            record = data[idx];\n            for (getter in getters) {\n                originalName = fieldNames[getter];\n\n                if (originalName && originalName !== getter) {\n                    if (!setters[originalName]) {\n                        setters[originalName] = kendo.setter(originalName);\n                    }\n                    setters[originalName](record, getters[getter](record));\n                    delete record[getter];\n                }\n            }\n        }\n    }\n\n    function convertRecords(data, getters, modelInstance, originalFieldNames, fieldNames) {\n        var record,\n            getter,\n            originalName,\n            idx,\n            length;\n\n        for (idx = 0, length = data.length; idx < length; idx++) {\n            record = data[idx];\n            for (getter in getters) {\n                record[getter] = modelInstance._parse(getter, getters[getter](record));\n\n                originalName = fieldNames[getter];\n                if (originalName && originalName !== getter) {\n                    delete record[originalName];\n                }\n            }\n        }\n    }\n\n    function convertGroup(data, getters, modelInstance, originalFieldNames, fieldNames) {\n        var record,\n            idx,\n            fieldName,\n            length;\n\n        for (idx = 0, length = data.length; idx < length; idx++) {\n            record = data[idx];\n\n            fieldName = originalFieldNames[record.field];\n            if (fieldName && fieldName != record.field) {\n                record.field = fieldName;\n            }\n\n            record.value = modelInstance._parse(record.field, record.value);\n\n            if (record.items) {\n                if (record.hasSubgroups) {\n                    convertGroup(record.items, getters, modelInstance, originalFieldNames, fieldNames);\n                } else {\n                    convertRecords(record.items, getters, modelInstance, originalFieldNames, fieldNames);\n                }\n            }\n        }\n    }\n\n    function wrapDataAccess(originalFunction, model, converter, getters, originalFieldNames, fieldNames) {\n        return function(data) {\n            data = originalFunction(data);\n\n            return wrapDataAccessBase(model, converter, getters, originalFieldNames, fieldNames)(data);\n        };\n    }\n\n    function wrapDataAccessBase(model, converter, getters, originalFieldNames, fieldNames) {\n        return function(data) {\n\n            if (data && !isEmptyObject(getters)) {\n                if (toString.call(data) !== \"[object Array]\" && !(data instanceof ObservableArray)) {\n                    data = [data];\n                }\n\n                converter(data, getters, new model(), originalFieldNames, fieldNames);\n            }\n\n            return data || [];\n        };\n    }\n\n    var DataReader = Class.extend({\n        init: function(schema) {\n            var that = this, member, get, model, base;\n\n            schema = schema || {};\n\n            for (member in schema) {\n                get = schema[member];\n\n                that[member] = typeof get === STRING ? getter(get) : get;\n            }\n\n            base = schema.modelBase || Model;\n\n            if (isPlainObject(that.model)) {\n                that.model = model = base.define(that.model);\n            }\n\n            var dataFunction = that.data.bind(that);\n\n            that._dataAccessFunction = dataFunction;\n\n            if (that.model) {\n                var groupsFunction = that.groups.bind(that),\n                    serializeFunction = that.serialize.bind(that),\n                    originalFieldNames = {},\n                    getters = {},\n                    serializeGetters = {},\n                    fieldNames = {},\n                    shouldSerialize = false,\n                    fieldName,\n                    name;\n\n                model = that.model;\n\n                if (model.fields) {\n                    each(model.fields, function(field, value) {\n                        var fromName;\n\n                        fieldName = field;\n\n                        if (isPlainObject(value) && value.field) {\n                            fieldName = value.field;\n                        } else if (typeof value === STRING) {\n                            fieldName = value;\n                        }\n\n                        if (isPlainObject(value) && value.from) {\n                            fromName = value.from;\n                        }\n\n                        shouldSerialize = shouldSerialize || (fromName && fromName !== field) || fieldName !== field;\n                        name = fromName || fieldName;\n                        getters[field] = name.indexOf(\".\") !== -1 ? getter(name, true) : getter(name);\n                        serializeGetters[field] = getter(field);\n                        originalFieldNames[fromName || fieldName] = field;\n                        fieldNames[field] = fromName || fieldName;\n                    });\n\n                    if (!schema.serialize && shouldSerialize) {\n                        that.serialize = wrapDataAccess(serializeFunction, model, serializeRecords, serializeGetters, originalFieldNames, fieldNames);\n                    }\n                }\n\n                that._dataAccessFunction = dataFunction;\n                that._wrapDataAccessBase = wrapDataAccessBase(model, convertRecords, getters, originalFieldNames, fieldNames);\n                that.data = wrapDataAccess(dataFunction, model, convertRecords, getters, originalFieldNames, fieldNames);\n                that.groups = wrapDataAccess(groupsFunction, model, convertGroup, getters, originalFieldNames, fieldNames);\n            }\n        },\n        errors: function(data) {\n            return data ? data.errors : null;\n        },\n        parse: identity,\n        data: identity,\n        total: function(data) {\n            return data.length;\n        },\n        groups: identity,\n        aggregates: function() {\n            return {};\n        },\n        serialize: function(data) {\n            return data;\n        }\n    });\n\n    function fillLastGroup(originalGroup, newGroup) {\n        var currOriginal;\n        var currentNew;\n\n        if (newGroup.items && newGroup.items.length) {\n            for (var i = 0; i < newGroup.items.length; i++) {\n                currOriginal = originalGroup.items[originalGroup.items.length - 1];\n                currentNew = newGroup.items[i];\n                if (currOriginal && currentNew) {\n                    if (currOriginal.hasSubgroups && currOriginal.value == currentNew.value) {\n                        fillLastGroup(currOriginal, currentNew);\n                    } else if (currOriginal.field && currOriginal.value == currentNew.value) {\n                        currOriginal.items.omitChangeEvent = true;\n                        currOriginal.items.push.apply(currOriginal.items, currentNew.items);\n                        currOriginal.items.omitChangeEvent = false;\n                    } else {\n                        originalGroup.items.omitChangeEvent = true;\n                        originalGroup.items.push.apply(originalGroup.items, [currentNew]);\n                        originalGroup.items.omitChangeEvent = false;\n                    }\n                } else if (currentNew) {\n                    originalGroup.items.omitChangeEvent = true;\n                    originalGroup.items.push.apply(originalGroup.items, [currentNew]);\n                    originalGroup.items.omitChangeEvent = false;\n                }\n            }\n        }\n    }\n    function mergeGroups(target, dest, skip, take) {\n        var group,\n            idx = 0,\n            items;\n\n        while (dest.length && take) {\n            group = dest[idx];\n            items = group.items;\n\n            var length = items.length;\n\n            if (target && target.field === group.field && target.value === group.value) {\n                if (target.hasSubgroups && target.items.length) {\n                    mergeGroups(target.items[target.items.length - 1], group.items, skip, take);\n                } else {\n                    items = items.slice(skip, skip + take);\n                    target.items = target.items.concat(items);\n                }\n                dest.splice(idx--, 1);\n            } else if (group.hasSubgroups && items.length) {\n                mergeGroups(group, items, skip, take);\n                if (!group.items.length) {\n                    dest.splice(idx--, 1);\n                }\n            } else {\n                items = items.slice(skip, skip + take);\n                group.items = items;\n\n                if (!group.items.length) {\n                    dest.splice(idx--, 1);\n                }\n            }\n\n            if (items.length === 0) {\n                skip -= length;\n            } else {\n                skip = 0;\n                take -= items.length;\n            }\n\n            if (++idx >= dest.length) {\n                break;\n            }\n        }\n\n        if (idx < dest.length) {\n            dest.splice(idx, dest.length - idx);\n        }\n    }\n\n    function flatGroups(groups, indexFunction) {\n        var result = [];\n        var groupsLength = (groups || []).length;\n        var group;\n        var items;\n        var indexFn = isFunction(indexFunction) ? indexFunction : function(array, index) {\n            return array[index];\n        };\n\n        for (var groupIndex = 0; groupIndex < groupsLength; groupIndex++) {\n            group = indexFn(groups, groupIndex);\n\n            if (group.hasSubgroups) {\n                result = result.concat(flatGroups(group.items));\n            } else {\n                items = group.items;\n\n                for (var itemIndex = 0; itemIndex < items.length; itemIndex++) {\n                    result.push(indexFn(items, itemIndex));\n                }\n            }\n        }\n        return result;\n    }\n\n    function flattenGroups(data) {\n        var idx,\n            result = [],\n            length,\n            items,\n            itemIndex;\n\n        for (idx = 0, length = data.length; idx < length; idx++) {\n            var group = data.at(idx);\n            if (group.items) {\n                if (group.hasSubgroups) {\n                    result = result.concat(flattenGroups(group.items));\n                } else {\n                    items = group.items;\n                    for (itemIndex = 0; itemIndex < items.length; itemIndex++) {\n                        result.push(items.at(itemIndex));\n                    }\n                }\n            }\n        }\n        return result;\n    }\n\n    function wrapGroupItems(data, model) {\n        var idx, length, group;\n        if (model) {\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                group = data.at(idx);\n                if (group.items) {\n                    if (group.hasSubgroups) {\n                        wrapGroupItems(group.items, model);\n                    } else {\n                        group.items = new LazyObservableArray(group.items, model, group.items._events);\n                    }\n                }\n            }\n        }\n    }\n\n    function eachGroupItems(data, func) {\n        for (var idx = 0; idx < data.length; idx++) {\n            if (data[idx].hasSubgroups) {\n                if (eachGroupItems(data[idx].items, func)) {\n                    return true;\n                }\n            } else if (func(data[idx].items, data[idx])) {\n                return true;\n            }\n        }\n    }\n\n    function replaceInRanges(ranges, data, item, observable) {\n        for (var idx = 0; idx < ranges.length; idx++) {\n            if (ranges[idx].data === data) {\n                break;\n            }\n            if (replaceInRange(ranges[idx].data, item, observable)) {\n                break;\n            }\n        }\n    }\n\n    function replaceInRange(items, item, observable) {\n        for (var idx = 0, length = items.length; idx < length; idx++) {\n            if (items[idx] && items[idx].hasSubgroups) {\n                return replaceInRange(items[idx].items, item, observable);\n            } else if (items[idx] === item || items[idx] === observable) {\n               items[idx] = observable;\n               return true;\n            }\n        }\n    }\n\n    function replaceWithObservable(view, data, ranges, type, serverGrouping) {\n        for (var viewIndex = 0, length = view.length; viewIndex < length; viewIndex++) {\n            var item = view[viewIndex];\n\n            if (!item || item instanceof type) {\n                continue;\n            }\n\n            if (item.hasSubgroups !== undefined && !serverGrouping) {\n                replaceWithObservable(item.items, data, ranges, type, serverGrouping);\n            } else {\n                for (var idx = 0; idx < data.length; idx++) {\n                    if (data[idx] === item) {\n                        view[viewIndex] = data.at(idx);\n                        replaceInRanges(ranges, data, item, view[viewIndex]);\n                        break;\n                    }\n                }\n            }\n        }\n    }\n\n    function removeModel(data, model) {\n        if (!data) {\n            return;\n        }\n        var length = data.length;\n        var dataItem;\n        var idx;\n\n        for (idx = 0; idx < length; idx++) {\n            dataItem = data[idx];\n\n            if (dataItem.uid && dataItem.uid == model.uid) {\n                data.splice(idx, 1);\n                return dataItem;\n            }\n        }\n    }\n\n    function indexOfPristineModel(data, model) {\n        if (model) {\n            return indexOf(data, function(item) {\n                return (item.uid && item.uid == model.uid) || (item[model.idField] === model.id && model.id !== model._defaultId);\n            });\n        }\n        return -1;\n    }\n\n    function indexOfModel(data, model) {\n        if (model) {\n            return indexOf(data, function(item) {\n                return item.uid == model.uid;\n            });\n        }\n        return -1;\n    }\n\n    function indexOf(data, comparer) {\n        var idx, length;\n        if (!data) {\n            return;\n        }\n\n        for (idx = 0, length = data.length; idx < length; idx++) {\n            if (comparer(data[idx])) {\n                return idx;\n            }\n        }\n\n        return -1;\n    }\n\n    function fieldNameFromModel(fields, name) {\n        if (fields && !isEmptyObject(fields)) {\n            var descriptor = fields[name];\n            var fieldName;\n            if (isPlainObject(descriptor)) {\n                fieldName = descriptor.from || descriptor.field || name;\n            } else {\n                fieldName = fields[name] || name;\n            }\n\n            if (isFunction(fieldName)) {\n                return name;\n            }\n\n            return fieldName;\n        }\n        return name;\n    }\n\n    function convertFilterDescriptorsField(descriptor, model) {\n        var idx,\n            length,\n            target = {};\n\n        for (var field in descriptor) {\n            if (field !== \"filters\") {\n                target[field] = descriptor[field];\n            }\n        }\n\n        if (descriptor.filters) {\n            target.filters = [];\n            for (idx = 0, length = descriptor.filters.length; idx < length; idx++) {\n                target.filters[idx] = convertFilterDescriptorsField(descriptor.filters[idx], model);\n            }\n        } else {\n            target.field = fieldNameFromModel(model.fields, target.field);\n        }\n        return target;\n    }\n\n    function convertDescriptorsField(descriptors, model) {\n        var idx,\n            length,\n            result = [],\n            target,\n            descriptor;\n\n        for (idx = 0, length = descriptors.length; idx < length; idx ++) {\n            target = {};\n\n            descriptor = descriptors[idx];\n\n            for (var field in descriptor) {\n                target[field] = descriptor[field];\n            }\n\n            target.field = fieldNameFromModel(model.fields, target.field);\n\n            if (target.aggregates && isArray(target.aggregates)) {\n                target.aggregates = convertDescriptorsField(target.aggregates, model);\n            }\n            result.push(target);\n        }\n        return result;\n    }\n\n    var DataSource = Observable.extend({\n        init: function(options) {\n            var that = this, model, data;\n\n            if (options) {\n                data = options.data;\n            }\n\n            options = that.options = extend({}, that.options, options);\n\n            that._map = {};\n            that._prefetch = {};\n            that._data = [];\n            that._pristineData = [];\n            that._ranges = [];\n            that._view = [];\n            that._pristineTotal = 0;\n            that._destroyed = [];\n            that._pageSize = options.pageSize;\n            that._page = options.page || (options.pageSize ? 1 : undefined);\n            that._sort = normalizeSort(options.sort);\n            that._sortFields = sortFields(options.sort);\n            that._filter = normalizeFilter(options.filter);\n            that._group = normalizeGroup(options.group);\n            that._aggregate = options.aggregate;\n            that._total = options.total;\n            that._groupPaging = options.groupPaging;\n\n            if (that._groupPaging) {\n                that._groupsState = {};\n            }\n            that._shouldDetachObservableParents = true;\n\n            Observable.fn.init.call(that);\n\n            that.transport = Transport.create(options, data, that);\n\n            if (isFunction(that.transport.push)) {\n                that.transport.push({\n                    pushCreate: that._pushCreate.bind(that),\n                    pushUpdate: that._pushUpdate.bind(that),\n                    pushDestroy: that._pushDestroy.bind(that)\n                });\n            }\n\n            if (options.offlineStorage != null) {\n                if (typeof options.offlineStorage == \"string\") {\n                    var key = options.offlineStorage;\n\n                    that._storage = {\n                        getItem: function() {\n                            return JSON.parse(localStorage.getItem(key));\n                        },\n                        setItem: function(item) {\n                            localStorage.setItem(key, stringify(that.reader.serialize(item)));\n                        }\n                    };\n                } else {\n                    that._storage = options.offlineStorage;\n                }\n            }\n\n            that.reader = new kendo.data.readers[options.schema.type || \"json\" ](options.schema);\n\n            model = that.reader.model || {};\n\n            that._detachObservableParents();\n\n            that._data = that._observe(that._data);\n            that._online = true;\n\n            that.bind([\"push\", ERROR, CHANGE, REQUESTSTART, SYNC, REQUESTEND, PROGRESS], options);\n        },\n\n        options: {\n            data: null,\n            schema: {\n               modelBase: Model\n            },\n            offlineStorage: null,\n            serverSorting: false,\n            serverPaging: false,\n            serverFiltering: false,\n            serverGrouping: false,\n            serverAggregates: false,\n            batch: false,\n            inPlaceSort: false\n        },\n\n        clone: function() {\n            return this;\n        },\n\n        online: function(value) {\n            if (value !== undefined) {\n                if (this._online != value) {\n                    this._online = value;\n\n                    if (value) {\n                        return this.sync();\n                    }\n                }\n\n                return $.Deferred().resolve().promise();\n            } else {\n                return this._online;\n            }\n        },\n\n        offlineData: function(state) {\n            if (this.options.offlineStorage == null) {\n                return null;\n            }\n\n            if (state !== undefined) {\n                return this._storage.setItem(state);\n            }\n\n            return this._storage.getItem() || [];\n        },\n\n        _isServerGrouped: function() {\n            var group = this.group() || [];\n\n            return this.options.serverGrouping && group.length;\n        },\n\n        _isServerGroupPaged: function() {\n            return this._isServerGrouped() && this._groupPaging;\n        },\n\n        _isGroupPaged: function() {\n            var group = this._group || [];\n\n            return this._groupPaging && group.length;\n        },\n\n        _pushCreate: function(result) {\n            this._push(result, \"pushCreate\");\n        },\n\n        _pushUpdate: function(result) {\n            this._push(result, \"pushUpdate\");\n        },\n\n        _pushDestroy: function(result) {\n            this._push(result, \"pushDestroy\");\n        },\n\n        _push: function(result, operation) {\n            var data = this._readData(result);\n\n            if (!data) {\n                data = result;\n            }\n\n            this[operation](data);\n        },\n\n        _flatData: function(data, skip) {\n            if (data) {\n                if (this._isServerGrouped()) {\n                    return flattenGroups(data);\n                }\n\n                if (!skip) {\n                    for (var idx = 0; idx < data.length; idx++) {\n                        data.at(idx);\n                    }\n                }\n            }\n\n            return data;\n        },\n\n        parent: noop,\n\n        get: function(id) {\n            var idx, length, data = this._flatData(this._data, this.options.useRanges);\n\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                if (data[idx].id == id) {\n                    return data[idx];\n                }\n            }\n        },\n\n        getByUid: function(id) {\n            return this._getByUid(id, this._data);\n        },\n\n        _getByUid: function(id, dataItems) {\n            var idx, length, data = this._flatData(dataItems, this.options.useRanges);\n\n            if (!data) {\n                return;\n            }\n\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                if (data[idx].uid == id) {\n                    return data[idx];\n                }\n            }\n        },\n\n        indexOf: function(model) {\n            return indexOfModel(this._data, model);\n        },\n\n        at: function(index) {\n            return this._data.at(index);\n        },\n\n        data: function(value) {\n            var that = this;\n            if (value !== undefined) {\n                that._detachObservableParents();\n                that._data = this._observe(value);\n\n                that._pristineData = value.slice(0);\n\n                that._storeData();\n\n                that._ranges = [];\n                that.trigger(\"reset\");\n                that._addRange(that._data);\n\n                that._total = that._data.length;\n                that._pristineTotal = that._total;\n\n                that._process(that._data);\n            } else {\n                if (that._data) {\n                    for (var idx = 0; idx < that._data.length; idx++) {\n                        that._data.at(idx);\n                    }\n                }\n\n                return that._data;\n            }\n        },\n\n        view: function(value) {\n            if (value === undefined) {\n                return this._view;\n            } else {\n                this._view = this._observeView(value);\n            }\n        },\n\n        _observeView: function(data) {\n            var that = this;\n            replaceWithObservable(data, that._data, that._ranges, that.reader.model || ObservableObject, that._isServerGrouped());\n\n            var view = new LazyObservableArray(data, that.reader.model);\n            view.parent = function() { return that.parent(); };\n            return view;\n        },\n\n        flatView: function() {\n            var groups = this.group() || [];\n\n            if (groups.length) {\n                return flattenGroups(this._view);\n            } else {\n                return this._view;\n            }\n        },\n\n        add: function(model) {\n            return this.insert(this._data.length, model);\n        },\n\n        _createNewModel: function(model) {\n            if (this.reader.model) {\n                return new this.reader.model(model);\n            }\n\n            if (model instanceof ObservableObject) {\n                return model;\n            }\n\n            return new ObservableObject(model);\n        },\n\n        insert: function(index, model) {\n            if (!model) {\n                model = index;\n                index = 0;\n            }\n\n            if (!(model instanceof Model)) {\n                model = this._createNewModel(model);\n            }\n\n            if (this._isServerGrouped()) {\n                this._data.splice(index, 0, this._wrapInEmptyGroup(model));\n            } else {\n                this._data.splice(index, 0, model);\n            }\n\n            this._insertModelInRange(index, model);\n\n            return model;\n        },\n\n        pushInsert: function(index, items) {\n            var that = this;\n            var rangeSpan = that._getCurrentRangeSpan();\n\n            if (!items) {\n                items = index;\n                index = 0;\n            }\n\n            if (!isArray(items)) {\n                items = [items];\n            }\n\n            var pushed = [];\n            var autoSync = this.options.autoSync;\n            this.options.autoSync = false;\n\n            try {\n                for (var idx = 0; idx < items.length; idx ++) {\n                    var item = items[idx];\n\n                    var result = this.insert(index, item);\n\n                    pushed.push(result);\n\n                    var pristine = result.toJSON();\n\n                    if (this._isServerGrouped()) {\n                        pristine = this._wrapInEmptyGroup(pristine);\n                    }\n\n                    this._pristineData.push(pristine);\n\n                    if (rangeSpan && rangeSpan.length) {\n                        $(rangeSpan).last()[0].pristineData.push(pristine);\n                    }\n\n                    index++;\n                }\n            } finally {\n                this.options.autoSync = autoSync;\n            }\n\n            if (pushed.length) {\n                this.trigger(\"push\", {\n                    type: \"create\",\n                    items: pushed\n                });\n            }\n        },\n\n        pushCreate: function(items) {\n            this.pushInsert(this._data.length, items);\n        },\n\n        pushUpdate: function(items) {\n            if (!isArray(items)) {\n                items = [items];\n            }\n\n            var pushed = [];\n\n            for (var idx = 0; idx < items.length; idx ++) {\n                var item = items[idx];\n                var model = this._createNewModel(item);\n\n                var target = this.get(model.id);\n\n                if (target) {\n                    pushed.push(target);\n\n                    target.accept(item);\n\n                    target.trigger(CHANGE);\n\n                    this._updatePristineForModel(target, item);\n                } else {\n                    this.pushCreate(item);\n                }\n            }\n\n            if (pushed.length) {\n                this.trigger(\"push\", {\n                    type: \"update\",\n                    items: pushed\n                });\n            }\n        },\n\n        pushDestroy: function(items) {\n            var pushed = this._removeItems(items);\n\n            if (pushed.length) {\n                this.trigger(\"push\", {\n                    type: \"destroy\",\n                    items: pushed\n                });\n            }\n        },\n\n        _removeItems: function(items, removePristine) {\n            if (!isArray(items)) {\n                items = [items];\n            }\n\n            var shouldRemovePristine = typeof removePristine !== \"undefined\" ? removePristine : true;\n\n            var destroyed = [];\n            var autoSync = this.options.autoSync;\n            this.options.autoSync = false;\n            try {\n                for (var idx = 0; idx < items.length; idx ++) {\n                    var item = items[idx];\n                    var model = this._createNewModel(item);\n                    var found = false;\n\n                    this._eachItem(this._data, function(items) {\n                        for (var idx = 0; idx < items.length; idx++) {\n                            var item = items.at(idx);\n                            if (item.id === model.id) {\n                                destroyed.push(item);\n                                items.splice(idx, 1);\n                                found = true;\n                                break;\n                            }\n                        }\n                    });\n\n                    if (found && shouldRemovePristine) {\n                        this._removePristineForModel(model);\n                        this._destroyed.pop();\n                    }\n                }\n            } finally {\n                this.options.autoSync = autoSync;\n            }\n\n            return destroyed;\n        },\n\n        pushMove: function(index, items) {\n            var pushed = this._moveItems(index, items);\n\n            if (pushed.length) {\n                this.trigger(\"push\", {\n                    type: \"update\",\n                    items: pushed\n                });\n            }\n        },\n\n        _moveItems: function(index, items) {\n            if (!isArray(items)) {\n                items = [items];\n            }\n\n            var moved = [];\n            var autoSync = this.options.autoSync;\n            this.options.autoSync = false;\n\n            try {\n                for (var i = 0; i < items.length; i ++) {\n                    var item = items[i];\n                    var model = this._createNewModel(item);\n\n                    this._eachItem(this._data, function(dataItems) {\n                        for (var idx = 0; idx < dataItems.length; idx++) {\n                            var dataItem = dataItems.at(idx);\n                            if (dataItem.id === model.id) {\n                                moved.push(dataItem);\n                                dataItems.splice(index >= idx ? --index : index, 0, dataItems.splice(idx, 1)[0]);\n                                index++;\n                                break;\n                            }\n                        }\n                    });\n                }\n            } finally {\n                this.options.autoSync = autoSync;\n            }\n\n            return moved;\n        },\n\n        remove: function(model) {\n            var result,\n                that = this,\n                hasGroups = that._isServerGrouped();\n\n            if (hasGroups && model.uid && (!model.isNew || !model.isNew())) {\n                that._pushInDestroyed(model);\n            }\n\n            this._eachItem(that._data, function(items) {\n                result = removeModel(items, model);\n\n                if (result && hasGroups) {\n                    return true;\n                }\n            });\n\n            this._removeModelFromRanges(model);\n\n            return model;\n        },\n\n        destroyed: function() {\n            return this._destroyed;\n        },\n\n        created: function() {\n            var idx,\n                length,\n                result = [],\n                data = this._flatData(this._data, this.options.useRanges);\n\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                if (data[idx].isNew && data[idx].isNew()) {\n                    result.push(data[idx]);\n                }\n            }\n            return result;\n        },\n\n        updated: function() {\n            var idx,\n                length,\n                result = [],\n                data = this._flatData(this._data, this.options.useRanges);\n\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                if ((data[idx].isNew && !data[idx].isNew()) && data[idx].dirty) {\n                    result.push(data[idx]);\n                }\n            }\n            return result;\n        },\n\n        sync: function() {\n            var that = this,\n                created = [],\n                updated = [],\n                destroyed = that._destroyed;\n\n            var promise = $.Deferred().resolve().promise();\n\n            if (that.online()) {\n\n                if (!that.reader.model) {\n                    return promise;\n                }\n\n                created = that.created();\n                updated = that.updated();\n\n                var promises = [];\n\n                if (that.options.batch && that.transport.submit) {\n                    promises = that._sendSubmit(created, updated, destroyed);\n                } else {\n                    promises.push.apply(promises, that._send(\"create\", created));\n                    promises.push.apply(promises, that._send(\"update\", updated));\n                    promises.push.apply(promises, that._send(\"destroy\", destroyed));\n                }\n\n                promise = $.when\n                 .apply(null, promises)\n                 .then(function() {\n                    var idx, length;\n\n                    for (idx = 0, length = arguments.length; idx < length; idx++) {\n                        if (arguments[idx]) {\n                            that._accept(arguments[idx]);\n                        }\n                    }\n\n                    that._storeData(true);\n\n                    that._syncEnd();\n\n                    that._change({ action: \"sync\" });\n\n                    that.trigger(SYNC);\n\n                    if (that._isServerGroupPaged()) {\n                        that.read();\n                    }\n                });\n            } else {\n                that._storeData(true);\n\n                that._syncEnd();\n\n                that._change({ action: \"sync\" });\n            }\n\n            return promise;\n        },\n\n        _syncEnd: noop,\n\n        cancelChanges: function(model) {\n            var that = this;\n\n            if (model instanceof kendo.data.Model) {\n                that._cancelModel(model);\n            } else {\n                that._destroyed = [];\n                that._detachObservableParents();\n                that._data = that._observe(that._pristineData);\n                if (that.options.serverPaging) {\n                    that._total = that._pristineTotal;\n                }\n\n                that._ranges = [];\n                that._addRange(that._data, 0);\n\n                that._changesCanceled();\n\n                that._change();\n\n                that._markOfflineUpdatesAsDirty();\n\n                if (that._isServerGrouped()) {\n                    that.read();\n                }\n            }\n        },\n\n        _changesCanceled: noop,\n\n        _markOfflineUpdatesAsDirty: function() {\n            var that = this;\n\n            if (that.options.offlineStorage != null) {\n                that._eachItem(that._data, function(items) {\n                    for (var idx = 0; idx < items.length; idx++) {\n                        var item = items.at(idx);\n                        if (item.__state__ == \"update\" || item.__state__ == \"create\") {\n                            item.dirty = true;\n                        }\n                    }\n                });\n            }\n        },\n\n        hasChanges: function() {\n            var idx,\n                length,\n                data = this._flatData(this._data, this.options.useRanges);\n\n            if (this._destroyed.length) {\n                return true;\n            }\n\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                if ((data[idx].isNew && data[idx].isNew()) || data[idx].dirty) {\n                    return true;\n                }\n            }\n\n            return false;\n        },\n\n        _accept: function(result) {\n            var that = this,\n                models = result.models,\n                response = result.response,\n                idx = 0,\n                serverGroup = that._isServerGrouped(),\n                pristine = that._pristineData,\n                type = result.type,\n                length;\n\n            that.trigger(REQUESTEND, { response: response, type: type });\n\n            if (response && !isEmptyObject(response)) {\n                response = that.reader.parse(response);\n\n                if (that._handleCustomErrors(response)) {\n                    return;\n                }\n\n                response = that.reader.data(response);\n\n                if (!isArray(response)) {\n                    response = [response];\n                }\n            } else {\n                response = $.map(models, function(model) { return model.toJSON(); } );\n            }\n\n            if (type === \"destroy\") {\n                that._destroyed = [];\n            }\n\n            for (idx = 0, length = models.length; idx < length; idx++) {\n                if (type !== \"destroy\") {\n                    models[idx].accept(response[idx]);\n\n                    if (type === \"create\") {\n                        pristine.push(serverGroup ? that._wrapInEmptyGroup(models[idx].toJSON()) : response[idx]);\n                    } else if (type === \"update\") {\n                        that._updatePristineForModel(models[idx], response[idx]);\n                    }\n                } else {\n                    that._removePristineForModel(models[idx]);\n                }\n            }\n        },\n\n        _updatePristineForModel: function(model, values) {\n            this._executeOnPristineForModel(model, function(index, items) {\n                kendo.deepExtend(items[index], values);\n            });\n        },\n\n        _executeOnPristineForModel: function(model, callback) {\n            this._eachPristineItem(\n                function(items) {\n                    var index = indexOfPristineModel(items, model);\n                    if (index > -1) {\n                        callback(index, items);\n                        return true;\n                    }\n                });\n        },\n\n        _removePristineForModel: function(model) {\n            this._executeOnPristineForModel(model, function(index, items) {\n                items.splice(index, 1);\n            });\n        },\n\n        _readData: function(data) {\n            var read = !this._isServerGrouped() ? this.reader.data : this.reader.groups;\n            return read.call(this.reader, data);\n        },\n\n        _eachPristineItem: function(callback) {\n            var that = this;\n            var options = that.options;\n            var rangeSpan = that._getCurrentRangeSpan();\n\n            that._eachItem(that._pristineData, callback);\n\n            if (options.serverPaging && options.useRanges) {\n                each(rangeSpan, function(i, range) {\n                    that._eachItem(range.pristineData, callback);\n                });\n            }\n        },\n\n       _eachItem: function(data, callback) {\n            if (data && data.length) {\n                if (this._isServerGrouped()) {\n                    eachGroupItems(data, callback);\n                } else {\n                    callback(data);\n                }\n            }\n        },\n\n        _pristineForModel: function(model) {\n            var pristine,\n                idx,\n                callback = function(items) {\n                    idx = indexOfPristineModel(items, model);\n                    if (idx > -1) {\n                        pristine = items[idx];\n                        return true;\n                    }\n                };\n\n            this._eachPristineItem(callback);\n\n            return pristine;\n        },\n\n        _cancelModel: function(model) {\n            var that = this;\n            var pristine = this._pristineForModel(model);\n\n            this._eachItem(this._data, function(items) {\n                var idx = indexOfModel(items, model);\n                if (idx >= 0) {\n                    if (pristine && (!model.isNew() || pristine.__state__)) {\n                        items[idx].accept(pristine);\n\n                        if (pristine.__state__ == \"update\") {\n                            items[idx].dirty = true;\n                        }\n\n                    } else {\n                        that._modelCanceled(model);\n\n                        items.splice(idx, 1);\n\n                        that._removeModelFromRanges(model);\n                    }\n                }\n            });\n        },\n\n        _modelCanceled: noop,\n\n        _submit: function(promises, data) {\n            var that = this;\n\n            that.trigger(REQUESTSTART, { type: \"submit\" });\n\n            that.trigger(PROGRESS);\n\n            that.transport.submit(extend({\n                success: function(response, type) {\n                    var promise = $.grep(promises, function(x) {\n                        return x.type == type;\n                    })[0];\n\n                    if (promise) {\n                        promise.resolve({\n                            response: response,\n                            models: promise.models,\n                            type: type\n                        });\n                    }\n                },\n                error: function(response, status, error) {\n                    for (var idx = 0; idx < promises.length; idx++) {\n                        promises[idx].reject(response);\n                    }\n\n                    that.error(response, status, error);\n                }\n            }, data));\n        },\n\n        _sendSubmit: function(created, updated, destroyed) {\n            var that = this,\n                promises = [];\n\n            if (that.options.batch) {\n                if (created.length) {\n                    promises.push($.Deferred(function(deferred) {\n                        deferred.type = \"create\";\n                        deferred.models = created;\n                    }));\n                }\n\n                if (updated.length) {\n                    promises.push($.Deferred(function(deferred) {\n                        deferred.type = \"update\";\n                        deferred.models = updated;\n                    }));\n                }\n\n                if (destroyed.length) {\n                    promises.push($.Deferred(function(deferred) {\n                        deferred.type = \"destroy\";\n                        deferred.models = destroyed;\n                    }));\n                }\n\n                that._submit(promises, {\n                    data: {\n                        created: that.reader.serialize(toJSON(created)),\n                        updated: that.reader.serialize(toJSON(updated)),\n                        destroyed: that.reader.serialize(toJSON(destroyed))\n                    }\n                });\n            }\n\n            return promises;\n        },\n\n        _promise: function(data, models, type) {\n            var that = this;\n\n            return $.Deferred(function(deferred) {\n                that.trigger(REQUESTSTART, { type: type });\n\n                that.trigger(PROGRESS);\n\n                that.transport[type].call(that.transport, extend({\n                    success: function(response) {\n                        deferred.resolve({\n                            response: response,\n                            models: models,\n                            type: type\n                        });\n                    },\n                    error: function(response, status, error) {\n                        deferred.reject(response);\n                        that.error(response, status, error);\n                    }\n                }, data));\n            }).promise();\n        },\n\n        _send: function(method, data) {\n            var that = this,\n                idx,\n                length,\n                promises = [],\n                converted = that.reader.serialize(toJSON(data));\n\n            if (that.options.batch) {\n                if (data.length) {\n                    promises.push(that._promise( { data: { models: converted } }, data , method));\n                }\n            } else {\n                for (idx = 0, length = data.length; idx < length; idx++) {\n                    promises.push(that._promise( { data: converted[idx] }, [ data[idx] ], method));\n                }\n            }\n\n            return promises;\n        },\n\n        read: function(data) {\n            var that = this, params = that._params(data);\n            var deferred = $.Deferred();\n\n            that._queueRequest(params, function() {\n                var isPrevented = that.trigger(REQUESTSTART, { type: \"read\" });\n                if (!isPrevented) {\n                    that.trigger(PROGRESS);\n\n                    that._ranges = [];\n                    that.trigger(\"reset\");\n                    if (that.online()) {\n                        that.transport.read({\n                            data: params,\n                            success: function(data) {\n                                that._ranges = [];\n                                that.success(data, params);\n\n                                deferred.resolve();\n                            },\n                            error: function() {\n                                var args = slice.call(arguments);\n\n                                that.error.apply(that, args);\n\n                                deferred.reject.apply(deferred, args);\n                            }\n                        });\n                    } else if (that.options.offlineStorage != null) {\n                        that.success(that.offlineData(), params);\n\n                        deferred.resolve();\n                    }\n                } else {\n                    that._dequeueRequest();\n\n                    deferred.resolve(isPrevented);\n                }\n            });\n\n            return deferred.promise();\n        },\n\n        _readAggregates: function(data) {\n            return this.reader.aggregates(data);\n        },\n\n        success: function(data) {\n            var that = this,\n                options = that.options,\n                items,\n                replaceSubset;\n\n            that.trigger(REQUESTEND, { response: data, type: \"read\" });\n\n            if (that.online()) {\n                data = that.reader.parse(data);\n\n                if (that._handleCustomErrors(data)) {\n                    that._dequeueRequest();\n                    return;\n                }\n\n                that._total = that.reader.total(data);\n\n                if (that._isServerGroupPaged()) {\n                    that._serverGroupsTotal = that._total;\n                }\n\n                if (that._pageSize > that._total) {\n                    that._pageSize = that._total;\n                    if (that.options.pageSize && that.options.pageSize > that._pageSize) {\n                        that._pageSize = that.options.pageSize;\n                    }\n                }\n\n                if (that._aggregate && options.serverAggregates) {\n                    that._aggregateResult = that._readAggregates(data);\n                }\n\n                data = that._readData(data);\n\n                that._destroyed = [];\n            } else {\n                data = that._readData(data);\n\n                items = [];\n                var itemIds = {};\n                var model = that.reader.model;\n                var idField = model ? model.idField : \"id\";\n                var idx;\n\n                for (idx = 0; idx < this._destroyed.length; idx++) {\n                    var id = this._destroyed[idx][idField];\n                    itemIds[id] = id;\n                }\n\n                for (idx = 0; idx < data.length; idx++) {\n                    var item = data[idx];\n                    var state = item.__state__;\n                    if (state == \"destroy\") {\n                        if (!itemIds[item[idField]]) {\n                            this._pushInDestroyed(this._createNewModel(item));\n                        }\n                    } else {\n                        items.push(item);\n                    }\n                }\n\n                data = items;\n\n                that._total = data.length;\n            }\n\n            that._pristineTotal = that._total;\n            replaceSubset = that._skip && that._data.length && that._skip < that._data.length;\n\n            if (that.options.endless) {\n                if (replaceSubset) {\n                    that._pristineData.splice(that._skip, that._pristineData.length);\n                }\n                items = data.slice(0);\n                for (var j = 0; j < items.length; j++) {\n                    that._pristineData.push(items[j]);\n                }\n            } else {\n                that._pristineData = data.slice(0);\n            }\n\n            that._detachObservableParents();\n\n            if (that.options.endless) {\n                that._data.unbind(CHANGE, that._changeHandler);\n\n                if (that._isServerGrouped() && that._data[that._data.length - 1].value === data[0].value) {\n                    fillLastGroup(that._data[that._data.length - 1], data[0]);\n                    data.shift();\n                }\n\n                data = that._observe(data);\n                if (replaceSubset) {\n                    that._data.splice(that._skip, that._data.length);\n                }\n                for (var i = 0; i < data.length; i++) {\n                    that._data.push(data[i]);\n                }\n                that._data.bind(CHANGE, that._changeHandler);\n            } else {\n                that._data = that._observe(data);\n            }\n\n            that._markOfflineUpdatesAsDirty();\n\n            that._storeData();\n\n            that._addRange(that._data);\n\n            that._process(that._data);\n\n            that._dequeueRequest();\n        },\n\n        _detachObservableParents: function() {\n            if (this._data && this._shouldDetachObservableParents) {\n                for (var idx = 0; idx < this._data.length; idx++) {\n                    if (this._data[idx].parent) {\n                        this._data[idx].parent = noop;\n                    }\n                }\n            }\n        },\n\n        _storeData: function(updatePristine) {\n            var serverGrouping = this._isServerGrouped();\n            var model = this.reader.model;\n\n            function items(data) {\n                var state = [];\n\n                for (var idx = 0; idx < data.length; idx++) {\n                    var dataItem = data.at(idx);\n                    var item = dataItem.toJSON();\n\n                    if (serverGrouping && dataItem.items) {\n                        item.items = items(dataItem.items);\n                    } else {\n                        item.uid = dataItem.uid;\n\n                        if (model) {\n                            if (dataItem.isNew()) {\n                                item.__state__ = \"create\";\n                            } else if (dataItem.dirty) {\n                                item.__state__ = \"update\";\n                            }\n                        }\n                    }\n                    state.push(item);\n                }\n\n                return state;\n            }\n\n            if (this.options.offlineStorage != null) {\n                var state = items(this._data);\n\n                var destroyed = [];\n\n                for (var idx = 0; idx < this._destroyed.length; idx++) {\n                    var item = this._destroyed[idx].toJSON();\n                    item.__state__ = \"destroy\";\n                    destroyed.push(item);\n                }\n\n                this.offlineData(state.concat(destroyed));\n\n                if (updatePristine) {\n                    this._pristineData = this.reader.reader ? this.reader.reader._wrapDataAccessBase(state) : this.reader._wrapDataAccessBase(state);\n                }\n            }\n        },\n\n        _addRange: function(data, skip) {\n            var that = this,\n                start = typeof (skip) !== \"undefined\" ? skip : (that._skip || 0),\n                end,\n                range = {\n                    data: data,\n                    pristineData: data.toJSON(),\n                    timestamp: that._timeStamp()\n                };\n\n            if (this._isGroupPaged()) {\n                end = start + data.length;\n                range.outerStart = start;\n                range.outerEnd = end;\n            } else {\n                end = start + that._flatData(data, true).length;\n            }\n\n            range.start = start;\n            range.end = end;\n            that._ranges.push(range);\n            that._sortRanges();\n\n            if (that._isGroupPaged()) {\n                if (!that._groupsFlat) {\n                    that._groupsFlat = [];\n                }\n                that._appendToGroupsFlat(range.data);\n                that._updateOuterRangesLength();\n            }\n        },\n\n        _appendToGroupsFlat: function(data) {\n            var length = data.length;\n\n            for (var i = 0; i < length; i++) {\n                this._groupsFlat.push(data[i]);\n            }\n        },\n\n        _getGroupByUid: function(uid) {\n            var length = this._groupsFlat.length;\n            var group;\n\n            for (var i = 0; i < length; i++) {\n                group = this._groupsFlat[i];\n                if (group.uid === uid) {\n                    return group;\n                }\n            }\n        },\n\n        _sortRanges: function() {\n            this._ranges.sort(function(x, y) {\n                return x.start - y.start;\n            });\n        },\n\n        error: function(xhr, status, errorThrown) {\n            this._dequeueRequest();\n            this.trigger(REQUESTEND, { });\n            this.trigger(ERROR, { xhr: xhr, status: status, errorThrown: errorThrown });\n        },\n\n        _params: function(data) {\n            var that = this,\n                options = extend({\n                    take: that.take(),\n                    skip: that.skip(),\n                    page: that.page(),\n                    pageSize: that.pageSize(),\n                    sort: that._sort,\n                    filter: that._filter,\n                    group: that._group,\n                    aggregate: that._aggregate,\n                    groupPaging: !!that._groupPaging\n                }, data);\n\n            if (!that.options.serverPaging) {\n                delete options.take;\n                delete options.skip;\n                delete options.page;\n                delete options.pageSize;\n            }\n\n            if (!that.options.serverGrouping) {\n                delete options.group;\n            } else if (that.reader.model && options.group) {\n                options.group = convertDescriptorsField(options.group, that.reader.model);\n            }\n\n            if (!that.options.serverFiltering) {\n                delete options.filter;\n            } else if (that.reader.model && options.filter) {\n               options.filter = convertFilterDescriptorsField(options.filter, that.reader.model);\n            }\n\n            if (!that.options.serverSorting) {\n                delete options.sort;\n            } else if (that.reader.model && options.sort) {\n                options.sort = convertDescriptorsField(options.sort, that.reader.model);\n            }\n\n            if (!that.options.serverAggregates) {\n                delete options.aggregate;\n            } else if (that.reader.model && options.aggregate) {\n                options.aggregate = convertDescriptorsField(options.aggregate, that.reader.model);\n            }\n\n            if (!that.options.groupPaging) {\n                delete options.groupPaging;\n            }\n\n            return options;\n        },\n\n        _queueRequest: function(options, callback) {\n            var that = this;\n            if (!that._requestInProgress) {\n                that._requestInProgress = true;\n                that._pending = undefined;\n                callback();\n            } else {\n                that._pending = { callback: callback.bind(that), options: options };\n            }\n        },\n\n        _dequeueRequest: function() {\n            var that = this;\n            that._requestInProgress = false;\n            if (that._pending) {\n                that._queueRequest(that._pending.options, that._pending.callback);\n            }\n        },\n\n        _handleCustomErrors: function(response) {\n            if (this.reader.errors) {\n                var errors = this.reader.errors(response);\n                if (errors) {\n                    this.trigger(ERROR, { xhr: null, status: \"customerror\", errorThrown: \"custom error\", errors: errors });\n                    return true;\n                }\n            }\n            return false;\n        },\n\n        _shouldWrap: function(data) {\n            var model = this.reader.model;\n\n            if (model && data.length) {\n                return !(data[0] instanceof model);\n            }\n\n            return false;\n        },\n\n        _observe: function(data) {\n            var that = this,\n                model = that.reader.model;\n\n            that._shouldDetachObservableParents = true;\n\n            if (data instanceof ObservableArray) {\n                that._shouldDetachObservableParents = false;\n                if (that._shouldWrap(data)) {\n                    data.type = that.reader.model;\n                    data.wrapAll(data, data);\n                }\n            } else {\n                var arrayType = that.pageSize() && !that.options.serverPaging ? LazyObservableArray : ObservableArray;\n                data = new arrayType(data, that.reader.model);\n                data.parent = function() { return that.parent(); };\n            }\n\n            if (that._isServerGrouped()) {\n                wrapGroupItems(data, model);\n            }\n\n            if (that._changeHandler && that._data && that._data instanceof ObservableArray &&\n                !(that.options.useRanges && that.options.serverPaging)) {\n                that._data.unbind(CHANGE, that._changeHandler);\n            } else {\n                that._changeHandler = that._change.bind(that);\n            }\n\n            return data.bind(CHANGE, that._changeHandler);\n        },\n\n        _updateTotalForAction: function(action, items) {\n            var that = this;\n\n            var total = parseInt(that._total, 10);\n\n            if (!isNumber(that._total)) {\n                total = parseInt(that._pristineTotal, 10);\n            }\n            if (action === \"add\") {\n                total += items.length;\n            } else if (action === \"remove\") {\n                total -= items.length;\n            } else if (action !== \"itemchange\" && action !== \"sync\" && !that.options.serverPaging) {\n                total = that._pristineTotal;\n            } else if (action === \"sync\") {\n                total = that._pristineTotal = parseInt(that._total, 10);\n            }\n\n            that._total = total;\n        },\n\n        _pushInDestroyed: function(model) {\n            var isPushed = this._destroyed.find(function(item) {\n                return item.uid === model.uid;\n            });\n            if (!isPushed) {\n                this._destroyed.push(model);\n            }\n        },\n\n        _change: function(e) {\n            var that = this, idx, length, action = e ? e.action : \"\";\n\n            if (action === \"remove\") {\n                for (idx = 0, length = e.items.length; idx < length; idx++) {\n                    if (!e.items[idx].isNew || !e.items[idx].isNew()) {\n                        that._pushInDestroyed(e.items[idx]);\n                    }\n                }\n            }\n\n            if (that.options.autoSync && (action === \"add\" || action === \"remove\" || action === \"itemchange\")) {\n\n                var handler = function(args) {\n                    if (args.action === \"sync\") {\n                        that.unbind(\"change\", handler);\n                        that._updateTotalForAction(action, e.items);\n                    }\n                };\n\n                that.first(\"change\", handler);\n\n                that.sync();\n\n            } else {\n                that._updateTotalForAction(action, e ? e.items : []);\n\n                that._process(that._data, e);\n            }\n        },\n\n        _calculateAggregates: function(data, options) {\n            options = options || {};\n\n            var query = new Query(data),\n                aggregates = options.aggregate,\n                filter = options.filter;\n\n            if (filter) {\n                query = query.filter(filter);\n            }\n\n            return query.aggregate(aggregates);\n        },\n\n        _process: function(data, e) {\n            var that = this,\n                options = {},\n                result;\n\n            if (that.options.serverPaging !== true) {\n                options.skip = that._skip;\n                options.take = that._take || that._pageSize;\n\n                if (options.skip === undefined && that._page !== undefined && that._pageSize !== undefined) {\n                    options.skip = (that._page - 1) * that._pageSize;\n                }\n\n                if (that.options.useRanges) {\n                    options.skip = that.currentRangeStart();\n                }\n            }\n\n            if (that.options.serverSorting !== true) {\n                options.sort = that._sort;\n            }\n\n            if (that.options.serverFiltering !== true) {\n                options.filter = that._filter;\n            }\n\n            if (that.options.serverGrouping !== true) {\n                options.group = that._group;\n            }\n\n            if (that.options.serverAggregates !== true) {\n                options.aggregate = that._aggregate;\n            }\n\n            if (that.options.serverGrouping) {\n                that._clearEmptyGroups(data);\n            }\n\n            options.groupPaging = that._groupPaging;\n\n            if (that._isGroupPaged() && e && (e.action === \"page\" || e.action === \"expandGroup\" || e.action === \"collapseGroup\")) {\n                result = that._queryProcess(data, {\n                    aggregate: that._aggregate\n                });\n            } else {\n                result = that._queryProcess(data, options);\n            }\n\n            if (that._filter && e && e.action === \"add\") {\n                var model = e.items[0],\n                    resultData = result.data;\n\n                var modelIsInView = resultData.find(function(item) {\n                    return item.uid === model.uid;\n                });\n\n                if (!modelIsInView) {\n                    result.data.splice(model.index, 0, model);\n                    result.total++;\n                }\n            }\n\n            if (that.options.serverAggregates !== true) {\n                // for performance reasons, calculate aggregates for part of the data only after query process\n                // this is necessary in the TreeList when paging\n                that._aggregateResult = that._calculateAggregates(result.dataToAggregate || data, options);\n            }\n\n            that._setView(result, options, e);\n\n            that._setFilterTotal(result.total, false);\n\n            e = e || {};\n\n            e.items = e.items || that._view;\n\n            that.trigger(CHANGE, e);\n        },\n\n        _setView: function(result, options, e) {\n            var that = this;\n\n            if (that._isGroupPaged() && !that._isServerGrouped()) {\n                if (e && (e.action === \"page\" || e.action === \"expandGroup\" || e.action === \"collapseGroup\")) {\n                    that.view(result.data);\n                    that._updateOuterRangesLength();\n                } else {\n                    that._ranges = [];\n                    var query = new Query(result.data);\n                    that._addRange(that._observe(result.data));\n\n                    if (options.skip + options.take > result.data.length) {\n                        options.skip = result.data.length - options.take;\n                    }\n\n                    that.view(query.range(options.skip, options.take).toArray());\n                }\n\n            } else {\n                that.view(result.data);\n            }\n        },\n\n        _clearEmptyGroups: function(data) {\n            for (var idx = data.length - 1; idx >= 0; idx--) {\n                var group = data[idx];\n                if (group.hasSubgroups) {\n                    this._clearEmptyGroups(group.items);\n                }\n\n                if (group.items && !group.items.length && !group.itemCount) {\n                    splice.apply(group.parent(), [idx, 1]);\n                }\n            }\n        },\n\n        _queryProcess: function(data, options) {\n            if (this.options.inPlaceSort) {\n                return Query.process(data, options, this.options.inPlaceSort);\n            }\n            else {\n                return Query.process(data, options);\n            }\n        },\n\n        _mergeState: function(options) {\n            var that = this;\n\n            if (options !== undefined) {\n                that._pageSize = options.pageSize;\n                that._page = options.page;\n                that._sort = options.sort;\n                that._filter = options.filter;\n                that._group = options.group;\n                that._aggregate = options.aggregate;\n                that._skip = that._currentRangeStart = options.skip;\n                that._take = options.take;\n\n                if (that._skip === undefined) {\n                    that._skip = that._currentRangeStart = that.skip();\n                    options.skip = that.skip();\n                }\n\n                if (that._take === undefined && that._pageSize !== undefined) {\n                    that._take = that._pageSize;\n                    options.take = that._take;\n                }\n\n                if (that.options.virtual) {\n                    options.virtual = that.options.virtual;\n                }\n\n                if (options.sort) {\n                    that._sort = options.sort = normalizeSort(options.sort);\n                    that._sortFields = sortFields(options.sort);\n                }\n\n                if (options.filter) {\n                    that._filter = options.filter = (that.options.accentFoldingFiltering && !$.isEmptyObject(options.filter)) ? $.extend({}, normalizeFilter(options.filter), { accentFoldingFiltering: that.options.accentFoldingFiltering }) : normalizeFilter(options.filter);\n                }\n\n                if (options.group) {\n                    that._group = options.group = normalizeGroup(options.group);\n                }\n                if (options.aggregate) {\n                    that._aggregate = options.aggregate = normalizeAggregate(options.aggregate);\n                }\n            }\n            return options;\n        },\n\n        query: function(options) {\n            var result;\n            var remote = this.options.serverSorting || this.options.serverPaging || this.options.serverFiltering || this.options.serverGrouping || this.options.serverAggregates;\n\n            if (remote || ((this._data === undefined || this._data.length === 0) && !this._destroyed.length)) {\n                if (this.options.endless) {\n                    var moreItemsCount = options.pageSize - this.pageSize();\n                    if (moreItemsCount > 0) {\n                        moreItemsCount = this.pageSize();\n                        options.page = options.pageSize / moreItemsCount;\n                        options.pageSize = moreItemsCount;\n                    } else {\n                        options.page = 1;\n                        this.options.endless = false;\n                    }\n                }\n                return this.read(this._mergeState(options));\n            }\n\n            var isPrevented = this.trigger(REQUESTSTART, { type: \"read\" });\n            if (!isPrevented) {\n                this.trigger(PROGRESS);\n                if (options) {\n                    options.groupPaging = this._groupPaging;\n                }\n                result = this._queryProcess(this._data, this._mergeState(options));\n\n                this._setFilterTotal(result.total, true);\n\n                this._aggregateResult = this._calculateAggregates(result.dataToAggregate || this._data, options);\n                this._setView(result, options);\n                this.trigger(REQUESTEND, { type: \"read\" });\n                this.trigger(CHANGE, { items: result.data, action: options ? options.action : \"\" });\n            }\n\n            return $.Deferred().resolve(isPrevented).promise();\n        },\n\n        _hasExpandedSubGroups: function(group) {\n            var result = false;\n            var length = group.items ? group.items.length : 0;\n\n            if (!group.hasSubgroups) {\n                return false;\n            }\n\n            for (var i = 0; i < length; i++) {\n                if (this._groupsState[group.items[i].uid]) {\n                    result = true;\n                    break;\n                }\n            }\n            return result;\n        },\n\n        _findGroupedRange: function(data, result, options, parents, callback) {\n            var that = this;\n            var length = data.length;\n            var group;\n            var current;\n            var itemsLength;\n            var groupCount;\n            var itemsToSkip;\n\n            for (var i = 0; i < length; i++) {\n                group = data[i];\n\n                if (options.taken >= options.take) {\n                    break;\n                }\n\n                if (!that._getGroupByUid(group.uid)) {\n                    that._groupsFlat.push(group);\n                }\n\n                if (that._groupsState[group.uid]) {\n                    if (that._isServerGroupPaged()) {\n                       if (that._fetchGroupItems(group, options, parents, callback)) {\n                            that._fetchingGroupItems = true;\n                            return;\n                       }\n                       groupCount = (group.subgroupCount || group.itemCount) + 1;\n                       itemsToSkip = options.skip - options.skipped;\n                       if (!that._hasExpandedSubGroups(group) && itemsToSkip > groupCount) {\n                           options.skipped += groupCount;\n                           continue;\n                       }\n                    }\n\n                    if (options.includeParents && options.skipped < options.skip) {\n                        options.skipped++;\n                        group.excludeHeader = true;\n                    } else if (options.includeParents) {\n                        options.taken++;\n                        group.excludeHeader = false;\n                    }\n\n                    if (group.hasSubgroups && group.items && group.items.length) {\n                        group.currentItems = [];\n\n                        if (!parents) {\n                            parents = [];\n                        }\n                        parents.push(group);\n\n                        that._findGroupedRange(group.items, group.currentItems, options, parents, callback);\n                        parents.pop();\n\n                        if (group.currentItems.length || options.taken > 0) {\n                            result.push(group);\n                        } else {\n                            group.excludeHeader = false;\n                        }\n                    } else {\n                        current = [];\n                        itemsLength = group.items.length;\n\n                        for (var j = 0; j < itemsLength; j++) {\n                            if (options.skipped < options.skip) {\n                                options.skipped++;\n                                continue;\n                            }\n\n                            if (options.taken >= options.take) {\n                                break;\n                            }\n                            current.push(group.items[j]);\n                            options.taken++;\n                        }\n\n                        if (current.length || options.taken > 0) {\n                            group.currentItems = current;\n                            result.push(group);\n                        } else {\n                            group.excludeHeader = false;\n                        }\n                    }\n                } else {\n                    if (options.skipped < options.skip) {\n                        options.skipped++;\n                        continue;\n                    }\n                    result.push(group);\n                    options.taken++;\n                }\n            }\n        },\n\n        _expandedSubGroupItemsCount: function(group, end, includeCurrentItems) {\n            var that = this;\n            var result = 0;\n            var subGroup;\n            var endSpecified = typeof end === \"number\";\n            var length = endSpecified ? end : group.subgroupCount;\n            var temp;\n\n            if (!group.hasSubgroups) {\n                return result;\n            }\n\n            for (var i = 0; i < length; i++) {\n                subGroup = group.items[i];\n\n                if (!subGroup) {\n                    break;\n                }\n\n                if (subGroup.hasSubgroups && that._groupsState[group.uid]) {\n                    temp = that._expandedSubGroupItemsCount(subGroup, length, true);\n                    result += temp;\n\n                    if (endSpecified) {\n                        length -= temp;\n                    }\n                } else if (!subGroup.hasSubgroups && that._groupsState[subGroup.uid]) {\n                    temp = subGroup.items ? subGroup.items.length : 0;\n                    result += temp;\n                    if (endSpecified) {\n                        length -= temp;\n                    }\n                }\n\n                if (includeCurrentItems) {\n                    result += 1;\n                    if (endSpecified) {\n                        length -= 1;\n                    }\n                }\n\n                if (endSpecified && result > length) {\n                    return result;\n                }\n            }\n\n            return result;\n        },\n\n        _fetchGroupItems: function(group, options, parents, callback) {\n            var that = this;\n            var groupItemsSkip;\n            var firstItem;\n            var lastItem;\n            var groupItemCount = group.hasSubgroups ? group.subgroupCount : group.itemCount;\n            var take = options.take;\n            var skipped = options.skipped;\n            var pageSize = that.take();\n            var expandedSubGroupItemsCount;\n\n            if (options.includeParents) {\n                if (skipped < options.skip) {\n                    skipped += 1;\n                } else {\n                    take -= 1;\n                }\n            }\n\n            if (!group.items || (group.items && !group.items.length)) {\n                that.getGroupItems(group, options, parents, callback, 0);\n                return true;\n            } else {\n                expandedSubGroupItemsCount = this._expandedSubGroupItemsCount(group, options.skip - skipped);\n                groupItemsSkip = Math.max(options.skip - (skipped + expandedSubGroupItemsCount), 0);\n\n                if (groupItemsSkip >= groupItemCount) {\n                    return false;\n                }\n\n                firstItem = group.items[groupItemsSkip];\n                lastItem = group.items[Math.min(groupItemsSkip + take, groupItemCount - 1)];\n\n                if (firstItem.notFetched) {\n                    that.getGroupItems(group, options, parents, callback, math.max(math.floor(groupItemsSkip / pageSize), 0) * pageSize, math.round((groupItemsSkip + pageSize) / pageSize));\n                    return true;\n                }\n\n                if (lastItem.notFetched) {\n                    that.getGroupItems(group, options, parents, callback, math.max(math.floor((groupItemsSkip + pageSize) / pageSize), 0) * pageSize, math.round((groupItemsSkip + pageSize) / pageSize));\n                    return true;\n                }\n            }\n        },\n\n        getGroupItems: function(group, options, parents, callback, groupItemsSkip, page) {\n            var that = this;\n            var take;\n            var filter;\n            var data;\n            var subgroups;\n\n            if (!group.items) {\n                group.items = [];\n            }\n\n            take = that.take();\n            filter = this._composeItemsFilter(group, parents);\n            data = {\n                page: page || 1,\n                pageSize: take,\n                skip: groupItemsSkip,\n                take: take,\n                filter: filter,\n                aggregate: that._aggregate,\n                sort: that._sort\n            };\n            subgroups = that.findSubgroups(group);\n\n            if (subgroups && subgroups.length) {\n                data.group = subgroups;\n                data.groupPaging = true;\n            }\n\n            clearTimeout(that._timeout);\n            that._timeout = setTimeout(function() {\n                that._queueRequest(data, function() {\n                    if (!that.trigger(REQUESTSTART, {\n                            type: \"read\"\n                        })) {\n                        that.transport.read({\n                            data: data,\n                            success: that._groupItemsSuccessHandler(group, options.skip, that.take(), callback, groupItemsSkip),\n                            error: function() {\n                                var args = slice.call(arguments);\n                                that.error.apply(that, args);\n                            }\n                        });\n                    } else {\n                        that._dequeueRequest();\n                    }\n                });\n            }, 100);\n        },\n\n        _groupItemsSuccessHandler: function(group, skip, take, callback, groupItemsSkip) {\n            var that = this;\n            var timestamp = that._timeStamp();\n            callback = isFunction(callback) ? callback : noop;\n            var totalField = that.options.schema && that.options.schema.total ? that.options.schema.total : \"Total\";\n\n            return function(data) {\n                var temp;\n                var model = Model.define(that.options.schema.model);\n                var totalCount;\n\n                that._dequeueRequest();\n\n                that.trigger(REQUESTEND, {\n                    response: data,\n                    type: \"read\"\n                });\n\n                if (isFunction(totalField)) {\n                    totalCount = totalField(data);\n                } else {\n                    totalCount = data[totalField];\n                }\n\n                data = that.reader.parse(data);\n\n                if (group.hasSubgroups) {\n                    temp = that.reader.groups(data);\n                    group.subgroupCount = totalCount;\n                } else {\n                    temp = that.reader.data(data);\n                    temp = temp.map(function(item) {\n                        return new model(item);\n                    });\n                }\n\n                group.items.omitChangeEvent = true;\n                for (var i = 0; i < totalCount; i++) {\n                    if (i >= groupItemsSkip && i < (groupItemsSkip + take) ) {\n                        group.items.splice(i, 1, temp[i - groupItemsSkip]);\n                    } else {\n                        if (!group.items[i]) {\n                            group.items.splice(i, 0, { notFetched: true });\n                        }\n                    }\n                }\n                group.items.omitChangeEvent = false;\n\n                that._updateRangePristineData(group);\n                that._fetchingGroupItems = false;\n\n                if (!group.countAdded) {\n                    that._serverGroupsTotal += totalCount;\n                    group.countAdded = true;\n                }\n\n                that.range(skip, take, callback, \"expandGroup\");\n\n                if (timestamp >= that._currentRequestTimeStamp || !that._skipRequestsInProgress) {\n                    that.trigger(CHANGE, {});\n                }\n            };\n        },\n\n        findSubgroups: function(group) {\n            var indexOfCurrentGroup = this._group.map(function(g) {\n                return g.field;\n            }).indexOf(group.field);\n\n            return this._group.slice(indexOfCurrentGroup + 1, this._group.length);\n        },\n\n        _composeItemsFilter: function(group, parents) {\n            var filter = this.filter() || {\n                logic: \"and\",\n                filters: []\n            };\n\n            filter.logic = 'and';\n            filter = extend(true, {}, filter);\n            filter.filters.push({\n                field: group.field,\n                operator: \"eq\",\n                value: group.value\n            });\n\n            if (parents) {\n                for (var i = 0; i < parents.length; i++) {\n                    filter.filters.push({\n                        field: parents[i].field,\n                        operator: \"eq\",\n                        value: parents[i].value\n                    });\n                }\n            }\n\n            return filter;\n        },\n\n        _updateRangePristineData: function(group) {\n            var that = this;\n            var ranges = that._ranges;\n            var rangesLength = ranges.length;\n            var temp;\n            var currentGroup;\n            var range;\n            var dataLength;\n            var indexes;\n            var currIdx;\n\n            for (var i = 0; i < rangesLength; i++) {\n                range = ranges[i];\n                dataLength = range.data.length;\n                indexes = [];\n                temp = null;\n\n                for (var j = 0; j < dataLength; j++) {\n                    currentGroup = range.data[j];\n                    indexes.push(j);\n\n                    if ((currentGroup.uid === group.uid) || (currentGroup.hasSubgroups && currentGroup.items.length && that._containsSubGroup(currentGroup, group, indexes))) {\n                        break;\n                    }\n                    indexes.pop();\n                }\n\n                if (indexes.length) {\n                    temp = ranges[i].pristineData;\n\n                    while (indexes.length > 1) {\n                        currIdx = indexes.splice(0, 1)[0];\n                        temp = temp[currIdx].items;\n                    }\n                    temp[indexes[0]] = that._cloneGroup(group);\n                    break;\n                }\n            }\n        },\n\n        _containsSubGroup: function(group, subgroup, indexes) {\n            var that = this;\n            var length = group.items.length;\n            var currentSubGroup;\n\n            if (group.hasSubgroups && length) {\n                for (var i = 0; i < length; i++) {\n                    currentSubGroup = group.items[i];\n                    indexes.push(i);\n                    if (currentSubGroup.uid === subgroup.uid ||\n                            (currentSubGroup.hasSubgroups &&\n                            currentSubGroup.items.length &&\n                            that._containsSubGroup(currentSubGroup, subgroup, indexes))) {\n                        return true;\n                    }\n                    indexes.pop();\n                }\n            }\n\n        },\n\n        _cloneGroup: function(group) {\n            var that = this;\n            group = typeof group.toJSON == \"function\" ? group.toJSON() : group;\n\n            if (group.items && group.items.length) {\n                group.items = group.items.map(function(item) {\n                    return that._cloneGroup(item);\n                });\n            }\n\n            return group;\n        },\n\n        _setFilterTotal: function(filterTotal, setDefaultValue) {\n            var that = this;\n\n            if (!that.options.serverFiltering) {\n                if (filterTotal !== undefined) {\n                    that._total = filterTotal;\n                } else if (setDefaultValue) {\n                    that._total = that._data.length;\n                }\n            }\n        },\n\n        fetch: function(callback) {\n            var that = this;\n            var fn = function(isPrevented) {\n                if (isPrevented !== true && isFunction(callback)) {\n                    callback.call(that);\n                }\n            };\n\n            return this._query().done(fn);\n        },\n\n        _query: function(options) {\n            var that = this;\n\n            return that.query(extend({}, {\n                page: that.page(),\n                pageSize: that.pageSize(),\n                sort: that.sort(),\n                filter: that.filter(),\n                group: that.group(),\n                aggregate: that.aggregate()\n            }, options));\n        },\n\n        next: function(options) {\n            var that = this,\n                page = that.page(),\n                total = that.total();\n\n            options = options || {};\n\n            if (!page || (total && page + 1 > that.totalPages())) {\n                return;\n            }\n\n            that._skip = that._currentRangeStart = page * that.take();\n\n            page += 1;\n            options.page = page;\n\n            that._query(options);\n\n            return page;\n        },\n\n        prev: function(options) {\n            var that = this,\n                page = that.page();\n\n            options = options || {};\n\n            if (!page || page === 1) {\n                return;\n            }\n\n            that._skip = that._currentRangeStart = that._skip - that.take();\n\n            page -= 1;\n            options.page = page;\n\n            that._query(options);\n\n            return page;\n        },\n\n        page: function(val) {\n            var that = this,\n            skip;\n\n            if (val !== undefined) {\n                val = math.max(math.min(math.max(val, 1), that.totalPages()), 1);\n                var take = that.take();\n\n                if (that._isGroupPaged()) {\n                    val -= 1;\n                    that.range(val * take, take, null, \"page\");\n                    return;\n                }\n                that._query(that._pageableQueryOptions({ page: val }));\n                return;\n            }\n            skip = that.skip();\n\n            return skip !== undefined ? math.round((skip || 0) / (that.take() || 1)) + 1 : undefined;\n        },\n\n        pageSize: function(val) {\n            var that = this;\n\n            if (val !== undefined) {\n                that._query(that._pageableQueryOptions({ pageSize: val, page: 1 }));\n                return;\n            }\n\n            return that.take();\n        },\n\n        sort: function(val) {\n            var that = this;\n\n            if (val !== undefined) {\n                that.trigger(\"sort\");\n                that._query({ sort: val });\n                return;\n            }\n\n            return that._sort;\n        },\n\n        filter: function(val) {\n            var that = this;\n\n            if (val === undefined) {\n                return that._filter;\n            }\n\n            that.trigger(\"reset\");\n            that._query({ filter: val, page: 1 });\n        },\n\n        group: function(val) {\n            var that = this;\n            var options = { group: val };\n\n            if (that._groupPaging) {\n                // clear ranges if ungrouping is performed\n                if (val !== undefined && (!val || !val.length) ) {\n                    that._ranges = [];\n                }\n                options.page = 1;\n            }\n\n            if (val !== undefined) {\n                that._query(options);\n                return;\n            }\n\n            return that._group;\n        },\n\n        getGroupsFlat: function(data) {\n            var idx,\n                result = [],\n                length;\n\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                var group = data[idx];\n                if (group.hasSubgroups) {\n                    result = result.concat(this.getGroupsFlat(group.items));\n                }\n\n                result.push(group);\n            }\n\n            return result;\n        },\n\n        total: function() {\n            return parseInt(this._total || 0, 10);\n        },\n\n        groupsTotal: function(includeExpanded) {\n            var that = this;\n\n            if (!that._group.length) {\n                return that.total();\n            }\n\n            if (that._isServerGrouped()) {\n                if (that._serverGroupsTotal) {\n                    return that._serverGroupsTotal;\n                }\n                that._serverGroupsTotal = that.total();\n\n                return that._serverGroupsTotal;\n            }\n\n            return that._calculateGroupsTotal(that._ranges.length ? that._ranges[0].data : [], includeExpanded);\n        },\n\n        _calculateGroupsTotal: function(groups, includeExpanded, itemsField, ignoreState) {\n            var that = this;\n            itemsField = itemsField || \"items\";\n            var total;\n            var length;\n\n            if (that._group.length && groups) {\n                total = 0;\n                length = groups.length;\n\n                for (var i = 0; i < length; i++) {\n                    total += that.groupCount(groups[i], includeExpanded, itemsField, ignoreState);\n                }\n                that._groupsTotal = total;\n                return total;\n            }\n\n            that._groupsTotal = that._data.length;\n            return that._groupsTotal;\n        },\n\n        groupCount: function(group, includeExpanded, itemsField, ignoreState) {\n            var that = this;\n            var total = 0;\n\n            if (group.hasSubgroups && that._groupsState[group.uid]) {\n                if (includeExpanded && !group.excludeHeader || ignoreState) {\n                    total += 1;\n                }\n\n                group[itemsField].forEach(function(subgroup) {\n                    total += that.groupCount(subgroup, includeExpanded, itemsField, ignoreState);\n                });\n            } else {\n                if (that._groupsState[group.uid]) {\n                    if (includeExpanded && !group.excludeHeader || ignoreState) {\n                        total++;\n                    }\n                    total += group[itemsField] ? group[itemsField].length : 0;\n                } else {\n                    total++;\n                }\n            }\n            return total;\n        },\n\n        countGroupRange: function(range) {\n            var total = 0;\n            var length = range.length;\n\n            for (var i = 0; i < length; i++) {\n                total += this.groupCount(range[i], true);\n            }\n\n            return total;\n        },\n\n        aggregate: function(val) {\n            var that = this;\n\n            if (val !== undefined) {\n                that._query({ aggregate: val });\n                return;\n            }\n\n            return that._aggregate;\n        },\n\n        aggregates: function() {\n            var result = this._aggregateResult;\n\n            if (isEmptyObject(result)) {\n                result = this._emptyAggregates(this.aggregate());\n            }\n\n            return result;\n        },\n\n        _emptyAggregates: function(aggregates) {\n            var result = {};\n\n            if (!isEmptyObject(aggregates)) {\n                var aggregate = {};\n\n                if (!isArray(aggregates)) {\n                    aggregates = [aggregates];\n                }\n\n                for (var idx = 0; idx < aggregates.length; idx++) {\n                    aggregate[aggregates[idx].aggregate] = 0;\n                    result[aggregates[idx].field] = aggregate;\n                }\n            }\n\n            return result;\n        },\n\n        _pageableQueryOptions: function(options) {\n            return options;\n        },\n\n        _wrapInEmptyGroup: function(model) {\n            var groups = this.group(),\n                parent,\n                group,\n                idx,\n                length;\n\n            for (idx = groups.length - 1, length = 0; idx >= length; idx--) {\n                group = groups[idx];\n                parent = {\n                    value: model.get ? model.get(group.field) : model[group.field],\n                    field: group.field,\n                    items: parent ? [parent] : [model],\n                    hasSubgroups: !!parent,\n                    aggregates: this._emptyAggregates(group.aggregates)\n                };\n            }\n\n            return parent;\n        },\n\n        totalPages: function() {\n            var that = this,\n                pageSize = that.pageSize() || that.total(),\n                total = that._isGroupPaged() ? that.groupsTotal(true) : that.total();\n\n            return math.ceil((total || 0) / pageSize);\n        },\n\n        inRange: function(skip, take) {\n            var that = this,\n                end = math.min(skip + take, that.total());\n\n            if (!that.options.serverPaging && that._data.length > 0) {\n                return true;\n            }\n\n            return that._findRange(skip, end).length > 0;\n        },\n\n        lastRange: function() {\n            var ranges = this._ranges;\n            return ranges[ranges.length - 1] || { start: 0, end: 0, data: [] };\n        },\n\n        firstItemUid: function() {\n            var ranges = this._ranges;\n            return ranges.length && ranges[0].data.length && ranges[0].data[0].uid;\n        },\n\n        enableRequestsInProgress: function() {\n            this._skipRequestsInProgress = false;\n        },\n\n        _timeStamp: function() {\n            return new Date().getTime();\n        },\n\n        range: function(skip, take, callback, action) {\n            this._currentRequestTimeStamp = this._timeStamp();\n            this._skipRequestsInProgress = true;\n            var total = this._isGroupPaged() ? this.groupsTotal(true) : this.total();\n\n            if (action === \"expandGroup\" || action === \"collapseGroup\") {\n                this._updateOuterRangesLength();\n            }\n\n            skip = math.min(skip || 0, total);\n            callback = isFunction(callback) ? callback : noop;\n\n            var that = this,\n                pageSkip = math.max(math.floor(skip / take), 0) * take,\n                size = math.min(pageSkip + take, total),\n                data;\n\n            data = that._findRange(skip, math.min(skip + take, total), callback);\n\n            if ((data.length || total === 0) && !that._fetchingGroupItems) {\n                that._processRangeData(data, skip, take, that._originalPageSkip || pageSkip, that._originalSize || size, {\n                    action: action\n                });\n                that._originalPageSkip = null;\n                that._originalSize = null;\n                callback();\n                return;\n            }\n\n            if (that._isGroupPaged()) {\n                that._originalPageSkip = pageSkip;\n                that._originalSize = size;\n\n                pageSkip = math.max(math.floor(that._adjustPageSkip(skip, take) / take), 0) * take;\n                size = math.min(pageSkip + take, total);\n            }\n\n            if (take !== undefined && !that._fetchingGroupItems) {\n                if ((that._isGroupPaged() && !that._groupRangeExists(pageSkip, take)) || !that._rangeExists(pageSkip, size)) {\n                    that.prefetch(pageSkip, take, function() {\n                        if (skip > pageSkip && size < that.total() && !that._rangeExists(size, math.min(size + take, that.total()))) {\n                            that.prefetch(size, take, function() {\n                                that.range(skip, take, callback );\n                            });\n                        } else {\n                            that.range(skip, take, callback);\n                        }\n                    });\n                } else if (pageSkip < skip) {\n                    that.prefetch(size, take, function() {\n                        that.range(skip, take, callback );\n                    });\n                }\n            }\n        },\n\n        _findRange: function(start, end, callback) {\n            var that = this,\n                ranges = that._ranges,\n                range,\n                data = [],\n                skipIdx,\n                takeIdx,\n                startIndex,\n                endIndex,\n                rangeData,\n                rangeEnd,\n                processed,\n                options = that.options,\n                remote = options.serverSorting || options.serverPaging || options.serverFiltering || options.serverGrouping || options.serverAggregates,\n                flatData,\n                count,\n                length,\n                groupMapOptions = {\n                        take: end - start,\n                        skip: start,\n                        skipped: 0,\n                        taken: 0,\n                        includeParents: true\n                    },\n                prevRangeEnd,\n                isGroupPaged = that._isGroupPaged(),\n                startField = isGroupPaged ? \"outerStart\" : \"start\",\n                endField = isGroupPaged ? \"outerEnd\" : \"end\",\n                currentDataLength;\n\n            for (skipIdx = 0, length = ranges.length; skipIdx < length; skipIdx++) {\n                range = ranges[skipIdx];\n\n                if (isGroupPaged) {\n                    if (range.outerStart >= end) {\n                        return [];\n                    }\n\n                    if (start > range.outerEnd) {\n                        groupMapOptions.skipped += range.outerEnd - (prevRangeEnd || 0);\n                        prevRangeEnd = range.outerEnd;\n                        continue;\n                    }\n\n                    if (typeof prevRangeEnd !== \"undefined\" && prevRangeEnd != range.outerStart) {\n                        groupMapOptions.skipped += range.outerStart - prevRangeEnd;\n                    }\n\n                    if (groupMapOptions.skipped > groupMapOptions.skip) {\n                        return [];\n                    }\n\n                    if (typeof prevRangeEnd === \"undefined\" && start > 0 && range.start > 0) {\n                        groupMapOptions.skipped = range.outerStart;\n                    }\n\n                    takeIdx = skipIdx;\n                    while (true) {\n                        this._findGroupedRange(range.data, data, groupMapOptions, null, callback);\n                        currentDataLength = that._calculateGroupsTotal(data, true, \"currentItems\");\n\n                        if (currentDataLength >= groupMapOptions.take) {\n                            return data;\n                        }\n\n                        if (that._fetchingGroupItems) {\n                            return [];\n                        }\n                        takeIdx++;\n\n                        if (ranges[takeIdx] && ranges[takeIdx].outerStart === range.outerEnd) {\n                            range = ranges[takeIdx];\n                        } else {\n                            break;\n                        }\n                    }\n                } else if (start >= range[startField] && start <= range[endField]) {\n                    count = 0;\n\n                    for (takeIdx = skipIdx; takeIdx < length; takeIdx++) {\n                        range = ranges[takeIdx];\n                        flatData = that._flatData(range.data, true);\n\n                        if (flatData.length && start + count >= range.start) {\n                            rangeData = range.data;\n                            rangeEnd = range.end;\n\n                            if (!remote) {\n                                if (options.inPlaceSort) {\n                                    processed = that._queryProcess(range.data, { filter: that.filter() });\n                                } else {\n                                    var sort = normalizeGroupWithoutCompare(that.group() || []).concat(normalizeSort(that.sort() || []));\n                                    processed = that._queryProcess(range.data, { sort: sort, filter: that.filter() });\n                                }\n                                flatData = rangeData = processed.data;\n\n                                if (processed.total !== undefined) {\n                                    rangeEnd = processed.total;\n                                }\n                            }\n\n                            startIndex = 0;\n                            if (start + count > range.start) {\n                                startIndex = (start + count) - range.start;\n                            }\n                            endIndex = flatData.length;\n                            if (rangeEnd > end) {\n                                endIndex = endIndex - (rangeEnd - end);\n                            }\n                            count += endIndex - startIndex;\n                            data = that._mergeGroups(data, rangeData, startIndex, endIndex);\n\n                            if (end <= range.end && count == end - start) {\n                                return data;\n                            }\n                        }\n                    }\n                    break;\n                }\n                prevRangeEnd = range.outerEnd;\n            }\n            return [];\n        },\n\n        _getRangesMismatch: function(pageSkip) {\n            var that = this;\n            var ranges = that._ranges;\n            var mismatch = 0;\n            var i = 0;\n\n            while (true) {\n                var range = ranges[i];\n                if (!range || range.outerStart > pageSkip) {\n                    break;\n                }\n\n                if (range.outerEnd != range.end) {\n                    mismatch = range.outerEnd - range.end;\n                }\n                i++;\n            }\n\n            return mismatch;\n        },\n\n        _mergeGroups: function(data, range, skip, take) {\n            if (this._isServerGrouped()) {\n                var temp = range.toJSON(),\n                    prevGroup;\n\n                if (data.length) {\n                    prevGroup = data[data.length - 1];\n                }\n\n                mergeGroups(prevGroup, temp, skip, take);\n\n                return data.concat(temp);\n            }\n            return data.concat(range.slice(skip, take));\n        },\n\n        _processRangeData: function(data, skip, take, pageSkip, size, eventData) {\n            var that = this;\n\n            that._pending = undefined;\n\n            that._skip = skip > that.skip() && !that._omitPrefetch ? math.min(size, (that.totalPages() - 1) * that.take()) : pageSkip;\n\n            that._currentRangeStart = skip;\n\n            that._take = take;\n\n            var paging = that.options.serverPaging;\n            var sorting = that.options.serverSorting;\n            var filtering = that.options.serverFiltering;\n            var aggregates = that.options.serverAggregates;\n            try {\n                that.options.serverPaging = true;\n                if (!that._isServerGrouped() && !(that.group() && that.group().length)) {\n                    that.options.serverSorting = true;\n                }\n                that.options.serverFiltering = true;\n                that.options.serverPaging = true;\n                that.options.serverAggregates = true;\n\n                if (paging) {\n                    that._detachObservableParents();\n                    that._data = data = that._observe(data);\n                }\n                that._process(data, eventData);\n            } finally {\n                that.options.serverPaging = paging;\n                that.options.serverSorting = sorting;\n                that.options.serverFiltering = filtering;\n                that.options.serverAggregates = aggregates;\n            }\n        },\n\n        skip: function() {\n            var that = this;\n\n            if (that._skip === undefined) {\n                return (that._page !== undefined ? (that._page - 1) * (that.take() || 1) : undefined);\n            }\n            return that._skip;\n        },\n\n        currentRangeStart: function() {\n            return this._currentRangeStart || 0;\n        },\n\n        take: function() {\n            return this._take || this._pageSize;\n        },\n\n        _prefetchSuccessHandler: function(skip, size, callback, force) {\n            var that = this;\n            var timestamp = that._timeStamp();\n\n            return function(data) {\n                var found = false,\n                    range = { start: skip, end: size, data: [], timestamp: that._timeStamp() },\n                    idx,\n                    length,\n                    temp;\n\n                that._dequeueRequest();\n\n                that.trigger(REQUESTEND, { response: data, type: \"read\" });\n\n                data = that.reader.parse(data);\n\n                temp = that._readData(data);\n\n                if (temp.length) {\n                    for (idx = 0, length = that._ranges.length; idx < length; idx++) {\n                        if (that._ranges[idx].start === skip) {\n                            found = true;\n                            range = that._ranges[idx];\n\n                            if (!that._isGroupPaged()) {\n                                range.pristineData = temp;\n                                range.data = that._observe(temp);\n                                range.end = range.start + that._flatData(range.data, true).length;\n                                that._sortRanges();\n                            }\n\n                            break;\n                        }\n                    }\n\n                    if (!found) {\n                        that._addRange(that._observe(temp), skip);\n                    }\n                }\n\n                that._total = that.reader.total(data);\n\n                if (force || (timestamp >= that._currentRequestTimeStamp || !that._skipRequestsInProgress)) {\n                    if (callback && temp.length) {\n                        callback();\n                    } else {\n                        that.trigger(CHANGE, {});\n                    }\n                }\n            };\n        },\n\n        prefetch: function(skip, take, callback) {\n            var that = this,\n                size = math.min(skip + take, that.total()),\n                options = {\n                    take: take,\n                    skip: skip,\n                    page: skip / take + 1,\n                    pageSize: take,\n                    sort: that._sort,\n                    filter: that._filter,\n                    group: that._group,\n                    aggregate: that._aggregate\n                };\n\n\n            if ((that._isGroupPaged() && !that._isServerGrouped() && that._groupRangeExists(skip, size))) {\n                if (callback) {\n                    callback();\n                }\n                return;\n            }\n\n            if ((that._isServerGroupPaged() && !that._groupRangeExists(skip, size)) || !that._rangeExists(skip, size)) {\n                clearTimeout(that._timeout);\n\n                that._timeout = setTimeout(function() {\n                    that._queueRequest(options, function() {\n                        if (!that.trigger(REQUESTSTART, { type: \"read\" })) {\n                            if (that._omitPrefetch) {\n                                that.trigger(PROGRESS);\n                            }\n                            that.transport.read({\n                                data: that._params(options),\n                                success: that._prefetchSuccessHandler(skip, size, callback),\n                                error: function() {\n                                    var args = slice.call(arguments);\n                                    that.error.apply(that, args);\n                                }\n                            });\n                        } else {\n                            that._dequeueRequest();\n                        }\n                    });\n                }, 100);\n            } else if (callback) {\n                callback();\n            }\n        },\n\n        _multiplePrefetch: function(skip, take, callback) {\n            var that = this,\n                size = math.min(skip + take, that.total()),\n                options = {\n                    take: take,\n                    skip: skip,\n                    page: skip / take + 1,\n                    pageSize: take,\n                    sort: that._sort,\n                    filter: that._filter,\n                    group: that._group,\n                    aggregate: that._aggregate\n                };\n\n            if (!that._rangeExists(skip, size)) {\n                if (!that.trigger(REQUESTSTART, { type: \"read\" })) {\n                    that.transport.read({\n                        data: that._params(options),\n                        success: that._prefetchSuccessHandler(skip, size, callback, true)\n                    });\n                }\n            } else if (callback) {\n                callback();\n            }\n        },\n\n        _adjustPageSkip: function(start, take) {\n            var that = this;\n            var prevRange = that._getPrevRange(start);\n            var result;\n            var total = that.total();\n            var mismatch;\n\n            if (prevRange) {\n                mismatch = that._getRangesMismatch(start);\n\n                if (!mismatch) {\n                    return start;\n                }\n                start -= mismatch;\n            }\n            result = math.max(math.floor(start / take), 0) * take;\n\n            if (result > total) {\n                while (true) {\n                    result -= take;\n                    if (result < total) {\n                        break;\n                    }\n                }\n            }\n            return result;\n        },\n\n        _getNextRange: function(end) {\n            var that = this,\n                ranges = that._ranges,\n                idx,\n                length;\n\n            for (idx = 0, length = ranges.length; idx < length; idx++) {\n                if (ranges[idx].start <= end && ranges[idx].end >= end) {\n                    return ranges[idx];\n                }\n            }\n        },\n\n        _getPrevRange: function(start) {\n            var that = this,\n                ranges = that._ranges,\n                idx,\n                range,\n                length = ranges.length;\n\n            for (idx = length - 1; idx >= 0; idx--) {\n                if (ranges[idx].outerStart <= start) {\n                    range = ranges[idx];\n                    break;\n                }\n\n            }\n\n            return range;\n        },\n\n        _rangeExists: function(start, end) {\n            var that = this,\n                ranges = that._ranges,\n                idx,\n                length;\n\n            for (idx = 0, length = ranges.length; idx < length; idx++) {\n                if (ranges[idx].start <= start && ranges[idx].end >= end) {\n                    return true;\n                }\n            }\n\n            return false;\n        },\n\n        _groupRangeExists: function(start, end) {\n            var that = this,\n                ranges = that._ranges,\n                idx,\n                length,\n                availableItemsCount = 0,\n                total = that.groupsTotal(true);\n\n            if (end > total && !that._isServerGrouped()) {\n                end = total;\n            }\n\n            for (idx = 0, length = ranges.length; idx < length; idx++) {\n                var range = ranges[idx];\n                if (range.outerStart <= start && range.outerEnd >= start) {\n                    availableItemsCount += range.outerEnd - start;\n                } else if (range.outerStart <= end && range.outerEnd >= end) {\n                    availableItemsCount += end - range.outerStart;\n                }\n            }\n\n            return availableItemsCount >= end - start;\n        },\n\n        _getCurrentRangeSpan: function() {\n            var that = this;\n            var ranges = that._ranges;\n            var start = that.currentRangeStart();\n            var end = start + (that.take() || 0);\n            var rangeSpan = [];\n            var range;\n            var idx;\n            var length = ranges.length;\n\n            for (idx = 0; idx < length; idx++) {\n                range = ranges[idx];\n\n                if ((range.start <= start && range.end >= start) || (range.start >= start && range.start <= end)) {\n                    rangeSpan.push(range);\n                }\n            }\n\n            return rangeSpan;\n        },\n\n        _removeModelFromRanges: function(model) {\n            var that = this;\n            var range;\n\n            for (var idx = 0, length = this._ranges.length; idx < length; idx++) {\n                range = this._ranges[idx];\n\n                that._removeModelFromRange(range, model);\n            }\n\n            that._updateRangesLength();\n        },\n\n        _removeModelFromRange: function(range, model) {\n            this._eachItem(range.data, function(data) {\n                if (!data) {\n                    return;\n                }\n                for (var idx = 0; idx < data.length; idx++) {\n                    var dataItem = data[idx];\n\n                    if (dataItem.uid && dataItem.uid == model.uid) {\n                        [].splice.call(data, idx, 1);\n                        break;\n                    }\n                }\n            });\n        },\n\n        _insertModelInRange: function(index, model) {\n            var that = this;\n            var ranges = that._ranges || [];\n            var rangesLength = ranges.length;\n            var range;\n            var i;\n\n            for (i = 0; i < rangesLength; i++) {\n                range = ranges[i];\n\n                if (range.start <= index && range.end >= index) {\n                    if (!that._getByUid(model.uid, range.data)) {\n                        if (that._isServerGrouped()) {\n                            range.data.splice(index, 0, that._wrapInEmptyGroup(model));\n                        } else {\n                            range.data.splice(index, 0, model);\n                        }\n                    }\n\n                    break;\n                }\n            }\n\n            that._updateRangesLength();\n        },\n\n        _updateRangesLength: function() {\n            var that = this;\n            var ranges = that._ranges || [];\n            var rangesLength = ranges.length;\n            var mismatchFound = false;\n            var mismatchLength = 0;\n            var lengthDifference = 0;\n            var rangeLength;\n            var range;\n            var i;\n\n            for (i = 0; i < rangesLength; i++) {\n                range = ranges[i];\n                rangeLength = that._isGroupPaged() ? range.data.length : that._flatData(range.data, true).length;\n                lengthDifference = rangeLength - math.abs(range.end - range.start);\n\n                if (!mismatchFound && lengthDifference !== 0) {\n                    mismatchFound = true;\n                    mismatchLength = lengthDifference;\n                    range.end += mismatchLength;\n                    continue;\n                }\n\n                if (mismatchFound) {\n                    range.start += mismatchLength;\n                    range.end += mismatchLength;\n                }\n            }\n        },\n\n        _updateOuterRangesLength: function() {\n            var that = this;\n            var ranges = that._ranges || [];\n            var rangesLength = ranges.length;\n            var mismatchLength = 0;\n            var range;\n            var i;\n            var prevRange;\n            var rangeLength;\n\n            for (i = 0; i < rangesLength; i++) {\n                range = ranges[i];\n                rangeLength = that._isGroupPaged() ? that._calculateGroupsTotal(range.data, true, \"items\", true) : that._flatData(range.data, true).length;\n\n                if (prevRange) {\n                    if (prevRange.end != range.start) {\n                        mismatchLength = range.start - prevRange.end;\n                    }\n                    range.outerStart = prevRange.outerEnd + mismatchLength;\n                    mismatchLength = 0;\n                } else {\n                    range.outerStart = range.start;\n                }\n\n                range.outerEnd = range.outerStart + rangeLength;\n                prevRange = range;\n            }\n        }\n    });\n\n    var Transport = {};\n\n    Transport.create = function(options, data, dataSource) {\n        var transport,\n            transportOptions = options.transport ? $.extend({}, options.transport) : null;\n\n        if (transportOptions) {\n            transportOptions.read = typeof transportOptions.read === STRING ? { url: transportOptions.read } : transportOptions.read;\n\n            if (options.type === \"jsdo\") {\n                transportOptions.dataSource = dataSource;\n            }\n\n            if (options.type) {\n                kendo.data.transports = kendo.data.transports || {};\n                kendo.data.schemas = kendo.data.schemas || {};\n\n                if (!kendo.data.transports[options.type]) {\n                    kendo.logToConsole(\"Unknown DataSource transport type '\" + options.type + \"'.\\nVerify that registration scripts for this type are included after Kendo UI on the page.\", \"warn\");\n                } else if (!isPlainObject(kendo.data.transports[options.type])) {\n                    transport = new kendo.data.transports[options.type](extend(transportOptions, { data: data }));\n                } else {\n                    transportOptions = extend(true, {}, kendo.data.transports[options.type], transportOptions);\n                }\n\n                options.schema = extend(true, {}, kendo.data.schemas[options.type], options.schema);\n            }\n\n            if (!transport) {\n                transport = isFunction(transportOptions.read) ? transportOptions : new RemoteTransport(transportOptions);\n            }\n        } else {\n            transport = new LocalTransport({ data: options.data || [] });\n        }\n        return transport;\n    };\n\n    DataSource.create = function(options) {\n        if (isArray(options) || options instanceof ObservableArray) {\n           options = { data: options };\n        }\n\n        var dataSource = options || {},\n            data = dataSource.data,\n            fields = dataSource.fields,\n            table = dataSource.table,\n            select = dataSource.select,\n            idx,\n            length,\n            model = {},\n            field;\n\n        if (!data && fields && !dataSource.transport) {\n            if (table) {\n                data = inferTable(table, fields);\n            } else if (select) {\n                data = inferSelect(select, fields);\n\n                if (dataSource.group === undefined && data[0] && data[0].optgroup !== undefined) {\n                    dataSource.group = \"optgroup\";\n                }\n            }\n        }\n\n        if (kendo.data.Model && fields && (!dataSource.schema || !dataSource.schema.model)) {\n            for (idx = 0, length = fields.length; idx < length; idx++) {\n                field = fields[idx];\n                if (field.type) {\n                    model[field.field] = field;\n                }\n            }\n\n            if (!isEmptyObject(model)) {\n                dataSource.schema = extend(true, dataSource.schema, { model: { fields: model } });\n            }\n        }\n\n        dataSource.data = data;\n\n        select = null;\n        dataSource.select = null;\n        table = null;\n        dataSource.table = null;\n\n        return dataSource instanceof DataSource ? dataSource : new DataSource(dataSource);\n    };\n\n    function inferSelect(select, fields) {\n        select = $(select)[0];\n        var options = select.options;\n        var firstField = fields[0];\n        var secondField = fields[1];\n\n        var data = [];\n        var idx, length;\n        var optgroup;\n        var option;\n        var record;\n        var value;\n\n        for (idx = 0, length = options.length; idx < length; idx++) {\n            record = {};\n            option = options[idx];\n            optgroup = option.parentNode;\n\n            if (optgroup === select) {\n                optgroup = null;\n            }\n\n            if (option.disabled || (optgroup && optgroup.disabled)) {\n                continue;\n            }\n\n            if (optgroup) {\n                record.optgroup = optgroup.label;\n            }\n\n            record[firstField.field] = option.text;\n\n            value = option.attributes.value;\n\n            if (value && value.specified) {\n                value = option.value;\n            } else {\n                value = option.text;\n            }\n\n            record[secondField.field] = value;\n\n            data.push(record);\n        }\n\n        return data;\n    }\n\n    function inferTable(table, fields) {\n        var tbody = $(table)[0].tBodies[0],\n        rows = tbody ? tbody.rows : [],\n        idx,\n        length,\n        fieldIndex,\n        fieldCount = fields.length,\n        data = [],\n        cells,\n        record,\n        cell,\n        empty;\n\n        for (idx = 0, length = rows.length; idx < length; idx++) {\n            record = {};\n            empty = true;\n            cells = rows[idx].cells;\n\n            for (fieldIndex = 0; fieldIndex < fieldCount; fieldIndex++) {\n                cell = cells[fieldIndex];\n                if (cell.nodeName.toLowerCase() !== \"th\") {\n                    empty = false;\n                    record[fields[fieldIndex].field] = cell.innerHTML;\n                }\n            }\n            if (!empty) {\n                data.push(record);\n            }\n        }\n\n        return data;\n    }\n\n    var Node = Model.define({\n        idField: \"id\",\n\n        init: function(value) {\n            var that = this,\n                hasChildren = that.hasChildren || value && value.hasChildren,\n                childrenField = \"items\",\n                childrenOptions = {};\n\n            kendo.data.Model.fn.init.call(that, value);\n\n            if (typeof that.children === STRING) {\n                childrenField = that.children;\n            }\n\n            childrenOptions = {\n                schema: {\n                    data: childrenField,\n                    model: {\n                        hasChildren: hasChildren,\n                        id: that.idField,\n                        fields: that.fields\n                    }\n                }\n            };\n\n            if (typeof that.children !== STRING) {\n                extend(childrenOptions, that.children);\n            }\n\n            childrenOptions.data = value;\n\n            if (!hasChildren) {\n                hasChildren = childrenOptions.schema.data;\n            }\n\n            if (typeof hasChildren === STRING) {\n                hasChildren = kendo.getter(hasChildren);\n            }\n\n            if (isFunction(hasChildren)) {\n                var hasChildrenObject = hasChildren.call(that, that);\n\n                if (hasChildrenObject && hasChildrenObject.length === 0) {\n                    that.hasChildren = false;\n                } else {\n                    that.hasChildren = !!hasChildrenObject;\n                }\n            }\n\n            that._childrenOptions = childrenOptions;\n\n            if (that.hasChildren) {\n                that._initChildren();\n            }\n\n            that._loaded = !!(value && value._loaded);\n        },\n\n        _initChildren: function() {\n            var that = this;\n            var children, transport, parameterMap;\n\n            if (!(that.children instanceof HierarchicalDataSource)) {\n                children = that.children = new HierarchicalDataSource(that._childrenOptions);\n\n                transport = children.transport;\n                parameterMap = transport.parameterMap;\n\n                transport.parameterMap = function(data, type) {\n                    data[that.idField || \"id\"] = that.id;\n\n                    if (parameterMap) {\n                        data = parameterMap.call(that, data, type);\n                    }\n\n                    return data;\n                };\n\n                children.parent = function() {\n                    return that;\n                };\n\n                children.bind(CHANGE, function(e) {\n                    e.node = e.node || that;\n                    that.trigger(CHANGE, e);\n                });\n\n                children.bind(ERROR, function(e) {\n                    var collection = that.parent();\n\n                    if (collection) {\n                        e.node = e.node || that;\n                        collection.trigger(ERROR, e);\n                    }\n                });\n\n                children.bind(ITEMSLOADED, function(e) {\n                    var collection = that.parent();\n\n                    if (collection) {\n                        collection.trigger(ITEMSLOADED, e);\n                    }\n                });\n\n                that._updateChildrenField();\n            }\n        },\n\n        append: function(model) {\n            this._initChildren();\n            this.loaded(true);\n            this.children.add(model);\n        },\n\n        hasChildren: false,\n\n        level: function() {\n            var parentNode = this.parentNode(),\n                level = 0;\n\n            while (parentNode && parentNode.parentNode) {\n                level++;\n                parentNode = parentNode.parentNode ? parentNode.parentNode() : null;\n            }\n\n            return level;\n        },\n\n        _updateChildrenField: function() {\n            var fieldName = this._childrenOptions.schema.data;\n\n            this[fieldName || \"items\"] = this.children.data();\n        },\n\n        _childrenLoaded: function() {\n            this._loaded = true;\n\n            this._updateChildrenField();\n        },\n\n        load: function() {\n            var options = {};\n            var method = \"_query\";\n            var children, promise;\n\n            if (this.hasChildren) {\n                this._initChildren();\n\n                children = this.children;\n\n                options[this.idField || \"id\"] = this.id;\n\n                if (!this._loaded) {\n                    children._data = undefined;\n                    method = \"read\";\n                }\n\n                children.one(CHANGE, this._childrenLoaded.bind(this));\n\n                if (this._matchFilter) {\n                    options.filter = { field: '_matchFilter', operator: 'eq', value: true };\n                }\n\n                promise = children[method](options);\n                if (!this._loaded) {\n                    this.trigger(ITEMLOAD, { promise: promise, node: this });\n                }\n            } else {\n                this.loaded(true);\n            }\n\n            return promise || $.Deferred().resolve().promise();\n        },\n\n        parentNode: function() {\n            var array = this.parent();\n\n            return array.parent();\n        },\n\n        loaded: function(value) {\n            if (value !== undefined) {\n                this._loaded = value;\n            } else {\n                return this._loaded;\n            }\n        },\n\n        shouldSerialize: function(field) {\n            return Model.fn.shouldSerialize.call(this, field) &&\n                    field !== \"children\" &&\n                    field !== \"_loaded\" &&\n                    field !== \"hasChildren\" &&\n                    field !== \"_childrenOptions\";\n        }\n    });\n\n    function dataMethod(name) {\n        return function() {\n            var data = this._data,\n                result = DataSource.fn[name].apply(this, slice.call(arguments));\n\n            if (this._data != data) {\n                this._attachBubbleHandlers();\n            }\n\n            return result;\n        };\n    }\n\n    var HierarchicalDataSource = DataSource.extend({\n        init: function(options) {\n            var node = Node.define({\n                children: options\n            });\n\n            if (options.filter && !options.serverFiltering) {\n                this._hierarchicalFilter = options.filter;\n                options.filter = null;\n            }\n\n            DataSource.fn.init.call(this, extend(true, {}, { schema: { modelBase: node, model: node } }, options));\n\n            this._attachBubbleHandlers();\n        },\n\n        _attachBubbleHandlers: function() {\n            var that = this;\n\n            that._data.bind(ERROR, function(e) {\n                that.trigger(ERROR, e);\n            });\n\n            that._data.bind(ITEMSLOADED, function(e) {\n                that.trigger(ITEMSLOADED, e);\n            });\n        },\n\n        loading: function() {\n            if (this._data) {\n                return this._data.loading() || this._childrenLoading();\n            }\n            return false;\n        },\n\n        _childrenLoading: function() {\n            var isLoading = false;\n            this._data.forEach(function(node) {\n                if (node.hasChildren && node.children.loading()) {\n                    isLoading = true;\n                }\n            });\n            return isLoading;\n        },\n\n        read: function(data) {\n            var result = DataSource.fn.read.call(this, data);\n\n            if (this._hierarchicalFilter) {\n                if (this._data && this._data.length > 0) {\n                    this.filter(this._hierarchicalFilter);\n                } else {\n                    this.options.filter = this._hierarchicalFilter;\n                    this._filter = normalizeFilter(this.options.filter);\n                    this._hierarchicalFilter = null;\n                }\n            }\n\n            return result;\n        },\n\n        remove: function(node) {\n            var parentNode = node.parentNode(),\n                dataSource = this,\n                result;\n\n            if (parentNode && parentNode._initChildren) {\n                dataSource = parentNode.children;\n            }\n\n            result = DataSource.fn.remove.call(dataSource, node);\n\n            if (parentNode && !dataSource.data().length) {\n                parentNode.hasChildren = false;\n            }\n\n            return result;\n        },\n\n        success: dataMethod(\"success\"),\n\n        data: dataMethod(\"data\"),\n\n        insert: function(index, model) {\n            var parentNode = this.parent();\n\n            if (parentNode && parentNode._initChildren) {\n                parentNode.hasChildren = true;\n                parentNode._initChildren();\n            }\n\n            return DataSource.fn.insert.call(this, index, model);\n        },\n\n        filter: function(val) {\n            if (val === undefined) {\n                 return this._filter;\n            }\n\n            if (!this.options.serverFiltering && this._markHierarchicalQuery(val)) {\n                val = { logic: \"or\", filters: [val, { field: '_matchFilter', operator: 'equals', value: true }] };\n            }\n\n            this.trigger(\"reset\");\n            this._query({ filter: val, page: 1 });\n        },\n\n        _markHierarchicalQuery: function(expressions) {\n            var compiled;\n            var predicate;\n            var fields;\n            var operators;\n            var filter;\n            var accentFoldingFiltering = this.options.accentFoldingFiltering;\n\n            expressions = accentFoldingFiltering ? $.extend({}, normalizeFilter(expressions), { accentFoldingFiltering: accentFoldingFiltering }) : normalizeFilter(expressions);\n\n            if (!expressions || expressions.filters.length === 0) {\n                this._updateHierarchicalFilter(function() {return true;});\n                return false;\n            }\n\n            compiled = Query.filterExpr(expressions);\n            fields = compiled.fields;\n            operators = compiled.operators;\n\n            predicate = filter = new Function(\"d, __f, __o\", \"return \" + compiled.expression);\n\n            if (fields.length || operators.length) {\n                filter = function(d) {\n                    return predicate(d, fields, operators);\n                };\n            }\n\n            this._updateHierarchicalFilter(filter);\n            return true;\n        },\n\n         _updateHierarchicalFilter: function(filter) {\n            var current;\n            var data = this._data;\n            var result = false;\n\n            for (var idx = 0; idx < data.length; idx++) {\n                 current = data[idx];\n\n                 if (current.hasChildren) {\n                     current._matchFilter = current.children._updateHierarchicalFilter(filter);\n                    if (!current._matchFilter) {\n                        current._matchFilter = filter(current);\n                    }\n                } else {\n                    current._matchFilter = filter(current);\n                }\n\n                if (current._matchFilter) {\n                    result = true;\n                }\n            }\n            return result;\n        },\n\n        _find: function(method, value) {\n            var idx, length, node, children;\n            var data = this._data;\n\n            if (!data) {\n                return;\n            }\n\n            node = DataSource.fn[method].call(this, value);\n\n            if (node) {\n                return node;\n            }\n\n            data = this._flatData(this._data);\n\n            for (idx = 0, length = data.length; idx < length; idx++) {\n                children = data[idx].children;\n\n                if (!(children instanceof HierarchicalDataSource)) {\n                    continue;\n                }\n\n                node = children[method](value);\n\n                if (node) {\n                    return node;\n                }\n            }\n        },\n\n        get: function(id) {\n            return this._find(\"get\", id);\n        },\n\n        getByUid: function(uid) {\n            return this._find(\"getByUid\", uid);\n        }\n    });\n\n    function inferList(list, fields) {\n        var items = $(list).children(),\n            idx,\n            length,\n            data = [],\n            record,\n            textField = fields[0].field,\n            urlField = fields[1] && fields[1].field,\n            spriteCssClassField = fields[2] && fields[2].field,\n            imageUrlField = fields[3] && fields[3].field,\n            item,\n            id,\n            textChild,\n            className,\n            children;\n\n        function elements(collection, tagName) {\n            return collection.filter(tagName).add(collection.find(tagName));\n        }\n\n        for (idx = 0, length = items.length; idx < length; idx++) {\n            record = { _loaded: true };\n            item = items.eq(idx);\n\n            textChild = item[0].firstChild;\n            children = item.children();\n            list = children.filter(\"ul\");\n            children = children.filter(\":not(ul)\");\n\n            id = item.attr(\"data-id\");\n\n            if (id) {\n                record.id = id;\n            }\n\n            if (textChild) {\n                record[textField] = textChild.nodeType == 3 ? textChild.nodeValue : children.text();\n            }\n\n            if (urlField) {\n                record[urlField] = elements(children, \"a\").attr(\"href\");\n            }\n\n            if (imageUrlField) {\n                record[imageUrlField] = elements(children, \"img\").attr(\"src\");\n            }\n\n            if (spriteCssClassField) {\n                className = elements(children, \".k-sprite\").prop(\"className\");\n                record[spriteCssClassField] = className && kendo.trim(className.replace(\"k-sprite\", \"\"));\n            }\n\n            if (list.length) {\n                record.items = inferList(list.eq(0), fields);\n            }\n\n            if (item.attr(\"data-hasChildren\") == \"true\") {\n                record.hasChildren = true;\n            }\n\n            data.push(record);\n        }\n\n        return data;\n    }\n\n    HierarchicalDataSource.create = function(options) {\n        options = options && options.push ? { data: options } : options;\n\n        var dataSource = options || {},\n            data = dataSource.data,\n            fields = dataSource.fields,\n            list = dataSource.list;\n\n        if (data && data._dataSource) {\n            return data._dataSource;\n        }\n\n        if (!data && fields && !dataSource.transport) {\n            if (list) {\n                data = inferList(list, fields);\n            }\n        }\n\n        dataSource.data = data;\n\n        return dataSource instanceof HierarchicalDataSource ? dataSource : new HierarchicalDataSource(dataSource);\n    };\n\n    var Buffer = kendo.Observable.extend({\n        init: function(dataSource, viewSize, disablePrefetch) {\n            kendo.Observable.fn.init.call(this);\n\n            this._prefetching = false;\n            this.dataSource = dataSource;\n            this.prefetch = !disablePrefetch;\n\n            var buffer = this;\n\n            dataSource.bind(\"change\", function() {\n                buffer._change();\n            });\n\n            dataSource.bind(\"reset\", function() {\n                buffer._reset();\n            });\n\n            this._syncWithDataSource();\n\n            this.setViewSize(viewSize);\n        },\n\n        setViewSize: function(viewSize) {\n            this.viewSize = viewSize;\n            this._recalculate();\n        },\n\n        at: function(index) {\n            var pageSize = this.pageSize,\n                itemPresent = true;\n\n            if (index >= this.total()) {\n                this.trigger(\"endreached\", { index: index });\n                return null;\n            }\n\n            if (!this.useRanges) {\n               return this.dataSource.view()[index];\n            }\n            if (this.useRanges) {\n                // out of range request\n                if (index < this.dataOffset || index >= this.skip + pageSize) {\n                    itemPresent = this.range(Math.floor(index / pageSize) * pageSize);\n                }\n\n                // prefetch\n                if (index === this.prefetchThreshold) {\n                    this._prefetch();\n                }\n\n                // mid-range jump - prefetchThreshold and nextPageThreshold may be equal, do not change to else if\n                if (index === this.midPageThreshold) {\n                    this.range(this.nextMidRange, true);\n                }\n                // next range jump\n                else if (index === this.nextPageThreshold) {\n                    this.range(this.nextFullRange);\n                }\n                // pull-back\n                else if (index === this.pullBackThreshold) {\n                    if (this.offset === this.skip) { // from full range to mid range\n                        this.range(this.previousMidRange);\n                    } else { // from mid range to full range\n                        this.range(this.previousFullRange);\n                    }\n                }\n\n                if (itemPresent) {\n                    return this.dataSource.at(index - this.dataOffset);\n                } else {\n                    this.trigger(\"endreached\", { index: index });\n                    return null;\n                }\n            }\n        },\n\n        indexOf: function(item) {\n            return this.dataSource.data().indexOf(item) + this.dataOffset;\n        },\n\n        total: function() {\n            return parseInt(this.dataSource.total(), 10);\n        },\n\n        next: function() {\n            var buffer = this,\n                pageSize = buffer.pageSize,\n                offset = buffer.skip - buffer.viewSize + pageSize,\n                pageSkip = math.max(math.floor(offset / pageSize), 0) * pageSize;\n\n            this.offset = offset;\n            this.dataSource.prefetch(pageSkip, pageSize, function() {\n                buffer._goToRange(offset, true);\n            });\n        },\n\n        range: function(offset, nextRange) {\n            if (this.offset === offset) {\n                return true;\n            }\n\n            var buffer = this,\n                pageSize = this.pageSize,\n                pageSkip = math.max(math.floor(offset / pageSize), 0) * pageSize,\n                dataSource = this.dataSource;\n\n            if (nextRange) {\n                pageSkip += pageSize;\n            }\n\n            if (dataSource.inRange(offset, pageSize)) {\n                this.offset = offset;\n                this._recalculate();\n                this._goToRange(offset);\n                return true;\n            } else if (this.prefetch) {\n                dataSource.prefetch(pageSkip, pageSize, function() {\n                    buffer.offset = offset;\n                    buffer._recalculate();\n                    buffer._goToRange(offset, true);\n                });\n                return false;\n            }\n\n            return true;\n        },\n\n        syncDataSource: function() {\n            var offset = this.offset;\n            this.offset = null;\n            this.range(offset);\n        },\n\n        destroy: function() {\n            this.unbind();\n        },\n\n        _prefetch: function() {\n            var buffer = this,\n                pageSize = this.pageSize,\n                prefetchOffset = this.skip + pageSize,\n                dataSource = this.dataSource;\n\n            if (!dataSource.inRange(prefetchOffset, pageSize) && !this._prefetching && this.prefetch) {\n                this._prefetching = true;\n                this.trigger(\"prefetching\", { skip: prefetchOffset, take: pageSize });\n\n                dataSource.prefetch(prefetchOffset, pageSize, function() {\n                    buffer._prefetching = false;\n                    buffer.trigger(\"prefetched\", { skip: prefetchOffset, take: pageSize });\n                });\n           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take: e.take });\n                },\n                \"reset\": function() {\n                    batchBuffer._total = 0;\n                    batchBuffer.trigger(\"reset\");\n                },\n                \"resize\": function() {\n                    batchBuffer._total = Math.ceil(this.length / batchBuffer.batchSize);\n                    batchBuffer.trigger(\"resize\", { total: batchBuffer.total(), offset: this.offset });\n                }\n            });\n        },\n\n        syncDataSource: function() {\n            this.buffer.syncDataSource();\n        },\n\n        at: function(index) {\n            var buffer = this.buffer,\n                skip = index * this.batchSize,\n                take = this.batchSize,\n                view = [],\n                item;\n\n            if (buffer.offset > skip) {\n                buffer.at(buffer.offset - 1);\n            }\n\n            for (var i = 0; i < take; i++) {\n                item = buffer.at(skip + i);\n\n           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