527 lines
16 KiB
JavaScript
527 lines
16 KiB
JavaScript
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//>>built
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define("dojox/data/OpmlStore", ["dojo/_base/declare", "dojo/_base/lang", "dojo/_base/xhr", "dojo/data/util/simpleFetch", "dojo/data/util/filter",
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"dojo/_base/window"],
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function(declare, lang, xhr, simpleFetch, filterUtil, winUtil) {
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var OpmlStore = declare("dojox.data.OpmlStore", null, {
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/* summary:
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* The OpmlStore implements the dojo.data.api.Read API.
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*/
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/* examples:
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* var opmlStore = new dojo.data.OpmlStore({url:"geography.xml"});
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* var opmlStore = new dojo.data.OpmlStore({url:"http://example.com/geography.xml"});
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*/
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constructor: function(/* Object */ keywordParameters){
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// summary: constructor
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// keywordParameters: {url: String, label: String} Where label is optional and configures what should be used as the return from getLabel()
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this._xmlData = null;
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this._arrayOfTopLevelItems = [];
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this._arrayOfAllItems = [];
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this._metadataNodes = null;
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this._loadFinished = false;
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this.url = keywordParameters.url;
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this._opmlData = keywordParameters.data; // XML DOM Document
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if(keywordParameters.label){
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this.label = keywordParameters.label;
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}
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this._loadInProgress = false; //Got to track the initial load to prevent duelling loads of the dataset.
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this._queuedFetches = [];
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this._identityMap = {};
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this._identCount = 0;
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this._idProp = "_I";
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if(keywordParameters && "urlPreventCache" in keywordParameters){
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this.urlPreventCache = keywordParameters.urlPreventCache?true:false;
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}
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},
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// label: [public] string
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// The attribute of the Opml item to act as a label.
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label: "text",
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// url: [public] string
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// The location from which to fetch the Opml document.
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url: "",
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// urlPreventCache: [public] boolean
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// Flag to denote if the underlying xhrGet call should set preventCache.
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urlPreventCache: false,
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_assertIsItem: function(/* item */ item){
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if(!this.isItem(item)){
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throw new Error("dojo.data.OpmlStore: a function was passed an item argument that was not an item");
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}
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},
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_assertIsAttribute: function(/* item || String */ attribute){
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// summary:
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// This function tests whether the item passed in is indeed a valid 'attribute' like type for the store.
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// attribute:
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// The attribute to test for being contained by the store.
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if(!lang.isString(attribute)){
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throw new Error("dojox.data.OpmlStore: a function was passed an attribute argument that was not an attribute object nor an attribute name string");
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}
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},
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_removeChildNodesThatAreNotElementNodes: function(/* node */ node, /* boolean */ recursive){
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var childNodes = node.childNodes;
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if(childNodes.length === 0){
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return;
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}
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var nodesToRemove = [];
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var i, childNode;
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for(i = 0; i < childNodes.length; ++i){
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childNode = childNodes[i];
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if(childNode.nodeType != 1){
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nodesToRemove.push(childNode);
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}
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}
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for(i = 0; i < nodesToRemove.length; ++i){
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childNode = nodesToRemove[i];
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node.removeChild(childNode);
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}
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if(recursive){
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for(i = 0; i < childNodes.length; ++i){
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childNode = childNodes[i];
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this._removeChildNodesThatAreNotElementNodes(childNode, recursive);
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}
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}
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},
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_processRawXmlTree: function(/* xmlDoc */ rawXmlTree){
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this._loadFinished = true;
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this._xmlData = rawXmlTree;
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var headNodes = rawXmlTree.getElementsByTagName('head');
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var headNode = headNodes[0];
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if(headNode){
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this._removeChildNodesThatAreNotElementNodes(headNode);
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this._metadataNodes = headNode.childNodes;
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}
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var bodyNodes = rawXmlTree.getElementsByTagName('body');
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var bodyNode = bodyNodes[0];
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if(bodyNode){
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this._removeChildNodesThatAreNotElementNodes(bodyNode, true);
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var bodyChildNodes = bodyNodes[0].childNodes;
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for(var i = 0; i < bodyChildNodes.length; ++i){
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var node = bodyChildNodes[i];
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if(node.tagName == 'outline'){
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this._identityMap[this._identCount] = node;
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this._identCount++;
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this._arrayOfTopLevelItems.push(node);
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this._arrayOfAllItems.push(node);
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this._checkChildNodes(node);
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}
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}
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}
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},
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_checkChildNodes: function(node /*Node*/){
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// summary:
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// Internal function to recurse over all child nodes from the store and add them
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// As non-toplevel items
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// description:
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// Internal function to recurse over all child nodes from the store and add them
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// As non-toplevel items
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//
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// node:
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// The child node to walk.
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if(node.firstChild){
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for(var i = 0; i < node.childNodes.length; i++){
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var child = node.childNodes[i];
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if(child.tagName == 'outline'){
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this._identityMap[this._identCount] = child;
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this._identCount++;
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this._arrayOfAllItems.push(child);
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this._checkChildNodes(child);
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}
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}
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}
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},
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_getItemsArray: function(/*object?*/queryOptions){
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// summary:
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// Internal function to determine which list of items to search over.
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// queryOptions: The query options parameter, if any.
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if(queryOptions && queryOptions.deep){
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return this._arrayOfAllItems;
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}
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return this._arrayOfTopLevelItems;
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},
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/***************************************
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dojo.data.api.Read API
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***************************************/
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getValue: function( /* item */ item,
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/* attribute || attribute-name-string */ attribute,
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/* value? */ defaultValue){
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// summary:
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// See dojo.data.api.Read.getValue()
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this._assertIsItem(item);
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this._assertIsAttribute(attribute);
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if(attribute == 'children'){
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return (item.firstChild || defaultValue); //Object
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}else{
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var value = item.getAttribute(attribute);
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return (value !== undefined) ? value : defaultValue; //Object
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}
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},
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getValues: function(/* item */ item,
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/* attribute || attribute-name-string */ attribute){
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// summary:
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// See dojo.data.api.Read.getValues()
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this._assertIsItem(item);
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this._assertIsAttribute(attribute);
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var array = [];
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if(attribute == 'children'){
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for(var i = 0; i < item.childNodes.length; ++i){
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array.push(item.childNodes[i]);
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}
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} else if(item.getAttribute(attribute) !== null){
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array.push(item.getAttribute(attribute));
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}
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return array; // Array
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},
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getAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getAttributes()
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this._assertIsItem(item);
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var attributes = [];
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var xmlNode = item;
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var xmlAttributes = xmlNode.attributes;
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for(var i = 0; i < xmlAttributes.length; ++i){
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var xmlAttribute = xmlAttributes.item(i);
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attributes.push(xmlAttribute.nodeName);
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}
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if(xmlNode.childNodes.length > 0){
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attributes.push('children');
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}
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return attributes; //Array
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},
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hasAttribute: function( /* item */ item,
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/* attribute || attribute-name-string */ attribute){
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// summary:
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// See dojo.data.api.Read.hasAttribute()
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return (this.getValues(item, attribute).length > 0); //Boolean
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},
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containsValue: function(/* item */ item,
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/* attribute || attribute-name-string */ attribute,
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/* anything */ value){
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// summary:
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// See dojo.data.api.Read.containsValue()
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var regexp = undefined;
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if(typeof value === "string"){
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regexp = filterUtil.patternToRegExp(value, false);
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}
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return this._containsValue(item, attribute, value, regexp); //boolean.
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},
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_containsValue: function( /* item */ item,
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/* attribute || attribute-name-string */ attribute,
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/* anything */ value,
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/* RegExp?*/ regexp){
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// summary:
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// Internal function for looking at the values contained by the item.
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// description:
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// Internal function for looking at the values contained by the item. This
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// function allows for denoting if the comparison should be case sensitive for
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// strings or not (for handling filtering cases where string case should not matter)
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//
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// item:
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// The data item to examine for attribute values.
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// attribute:
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// The attribute to inspect.
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// value:
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// The value to match.
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// regexp:
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// Optional regular expression generated off value if value was of string type to handle wildcarding.
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// If present and attribute values are string, then it can be used for comparison instead of 'value'
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var values = this.getValues(item, attribute);
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for(var i = 0; i < values.length; ++i){
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var possibleValue = values[i];
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if(typeof possibleValue === "string" && regexp){
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return (possibleValue.match(regexp) !== null);
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}else{
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//Non-string matching.
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if(value === possibleValue){
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return true; // Boolean
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}
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}
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}
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return false; // Boolean
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},
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isItem: function(/* anything */ something){
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// summary:
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// See dojo.data.api.Read.isItem()
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// description:
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// Four things are verified to ensure that "something" is an item:
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// something can not be null, the nodeType must be an XML Element,
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// the tagName must be "outline", and the node must be a member of
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// XML document for this datastore.
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return (something &&
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something.nodeType == 1 &&
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something.tagName == 'outline' &&
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something.ownerDocument === this._xmlData); //Boolean
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},
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isItemLoaded: function(/* anything */ something){
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// summary:
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// See dojo.data.api.Read.isItemLoaded()
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// OpmlStore loads every item, so if it's an item, then it's loaded.
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return this.isItem(something); //Boolean
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},
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loadItem: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.loadItem()
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// description:
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// The OpmlStore always loads all items, so if it's an item, then it's loaded.
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// From the dojo.data.api.Read.loadItem docs:
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// If a call to isItemLoaded() returns true before loadItem() is even called,
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// then loadItem() need not do any work at all and will not even invoke the callback handlers.
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},
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getLabel: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getLabel()
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if(this.isItem(item)){
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return this.getValue(item,this.label); //String
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}
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return undefined; //undefined
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},
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getLabelAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getLabelAttributes()
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return [this.label]; //array
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},
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// The dojo.data.api.Read.fetch() function is implemented as
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// a mixin from dojo.data.util.simpleFetch.
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// That mixin requires us to define _fetchItems().
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_fetchItems: function( /* Object */ keywordArgs,
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/* Function */ findCallback,
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/* Function */ errorCallback){
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// summary:
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// See dojo.data.util.simpleFetch.fetch()
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var self = this;
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var filter = function(requestArgs, arrayOfItems){
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var items = null;
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if(requestArgs.query){
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items = [];
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var ignoreCase = requestArgs.queryOptions ? requestArgs.queryOptions.ignoreCase : false;
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//See if there are any string values that can be regexp parsed first to avoid multiple regexp gens on the
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//same value for each item examined. Much more efficient.
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var regexpList = {};
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for(var key in requestArgs.query){
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var value = requestArgs.query[key];
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if(typeof value === "string"){
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regexpList[key] = filterUtil.patternToRegExp(value, ignoreCase);
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}
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}
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for(var i = 0; i < arrayOfItems.length; ++i){
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var match = true;
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var candidateItem = arrayOfItems[i];
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for(var key in requestArgs.query){
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var value = requestArgs.query[key];
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if(!self._containsValue(candidateItem, key, value, regexpList[key])){
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match = false;
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}
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}
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if(match){
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items.push(candidateItem);
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}
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}
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}else{
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// We want a copy to pass back in case the parent wishes to sort the array. We shouldn't allow resort
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// of the internal list so that multiple callers can get lists and sort without affecting each other.
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if(arrayOfItems.length> 0){
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items = arrayOfItems.slice(0,arrayOfItems.length);
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}
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}
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findCallback(items, requestArgs);
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};
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if(this._loadFinished){
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filter(keywordArgs, this._getItemsArray(keywordArgs.queryOptions));
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}else{
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//If fetches come in before the loading has finished, but while
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//a load is in progress, we have to defer the fetching to be
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//invoked in the callback.
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if(this._loadInProgress){
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this._queuedFetches.push({args: keywordArgs, filter: filter});
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}else{
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if(this.url !== ""){
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this._loadInProgress = true;
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var getArgs = {
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url: self.url,
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handleAs: "xml",
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preventCache: self.urlPreventCache
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};
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var getHandler = xhr.get(getArgs);
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getHandler.addCallback(function(data){
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self._processRawXmlTree(data);
|
||
|
|
filter(keywordArgs, self._getItemsArray(keywordArgs.queryOptions));
|
||
|
|
self._handleQueuedFetches();
|
||
|
|
});
|
||
|
|
getHandler.addErrback(function(error){
|
||
|
|
throw error;
|
||
|
|
});
|
||
|
|
}else if(this._opmlData){
|
||
|
|
this._processRawXmlTree(this._opmlData);
|
||
|
|
this._opmlData = null;
|
||
|
|
filter(keywordArgs, this._getItemsArray(keywordArgs.queryOptions));
|
||
|
|
}else{
|
||
|
|
throw new Error("dojox.data.OpmlStore: No OPML source data was provided as either URL or XML data input.");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
getFeatures: function(){
|
||
|
|
// summary: See dojo.data.api.Read.getFeatures()
|
||
|
|
var features = {
|
||
|
|
'dojo.data.api.Read': true,
|
||
|
|
'dojo.data.api.Identity': true
|
||
|
|
};
|
||
|
|
return features; //Object
|
||
|
|
},
|
||
|
|
|
||
|
|
/***************************************
|
||
|
|
dojo.data.api.Identity API
|
||
|
|
***************************************/
|
||
|
|
getIdentity: function(/* item */ item){
|
||
|
|
// summary:
|
||
|
|
// See dojo.data.api.Identity.getIdentity()
|
||
|
|
if(this.isItem(item)){
|
||
|
|
//No ther way to do this other than O(n) without
|
||
|
|
//complete rework of how the tree stores nodes.
|
||
|
|
for(var i in this._identityMap){
|
||
|
|
if(this._identityMap[i] === item){
|
||
|
|
return i;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return null; //null
|
||
|
|
},
|
||
|
|
|
||
|
|
fetchItemByIdentity: function(/* Object */ keywordArgs){
|
||
|
|
// summary:
|
||
|
|
// See dojo.data.api.Identity.fetchItemByIdentity()
|
||
|
|
|
||
|
|
//Hasn't loaded yet, we have to trigger the load.
|
||
|
|
if(!this._loadFinished){
|
||
|
|
var self = this;
|
||
|
|
if(this.url !== ""){
|
||
|
|
//If fetches come in before the loading has finished, but while
|
||
|
|
//a load is in progress, we have to defer the fetching to be
|
||
|
|
//invoked in the callback.
|
||
|
|
if(this._loadInProgress){
|
||
|
|
this._queuedFetches.push({args: keywordArgs});
|
||
|
|
}else{
|
||
|
|
this._loadInProgress = true;
|
||
|
|
var getArgs = {
|
||
|
|
url: self.url,
|
||
|
|
handleAs: "xml"
|
||
|
|
};
|
||
|
|
var getHandler = xhr.get(getArgs);
|
||
|
|
getHandler.addCallback(function(data){
|
||
|
|
var scope = keywordArgs.scope ? keywordArgs.scope : winUtil.global;
|
||
|
|
try{
|
||
|
|
self._processRawXmlTree(data);
|
||
|
|
var item = self._identityMap[keywordArgs.identity];
|
||
|
|
if(!self.isItem(item)){
|
||
|
|
item = null;
|
||
|
|
}
|
||
|
|
if(keywordArgs.onItem){
|
||
|
|
keywordArgs.onItem.call(scope, item);
|
||
|
|
}
|
||
|
|
self._handleQueuedFetches();
|
||
|
|
}catch(error){
|
||
|
|
if(keywordArgs.onError){
|
||
|
|
keywordArgs.onError.call(scope, error);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
getHandler.addErrback(function(error){
|
||
|
|
this._loadInProgress = false;
|
||
|
|
if(keywordArgs.onError){
|
||
|
|
var scope = keywordArgs.scope ? keywordArgs.scope : winUtil.global;
|
||
|
|
keywordArgs.onError.call(scope, error);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}else if(this._opmlData){
|
||
|
|
this._processRawXmlTree(this._opmlData);
|
||
|
|
this._opmlData = null;
|
||
|
|
var item = this._identityMap[keywordArgs.identity];
|
||
|
|
if(!self.isItem(item)){
|
||
|
|
item = null;
|
||
|
|
}
|
||
|
|
if(keywordArgs.onItem){
|
||
|
|
var scope = keywordArgs.scope ? keywordArgs.scope : winUtil.global;
|
||
|
|
keywordArgs.onItem.call(scope, item);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}else{
|
||
|
|
//Already loaded. We can just look it up and call back.
|
||
|
|
var item = this._identityMap[keywordArgs.identity];
|
||
|
|
if(!this.isItem(item)){
|
||
|
|
item = null;
|
||
|
|
}
|
||
|
|
if(keywordArgs.onItem){
|
||
|
|
var scope = keywordArgs.scope ? keywordArgs.scope : winUtil.global;
|
||
|
|
keywordArgs.onItem.call(scope, item);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
getIdentityAttributes: function(/* item */ item){
|
||
|
|
// summary:
|
||
|
|
// See dojo.data.api.Identity.getIdentifierAttributes()
|
||
|
|
|
||
|
|
//Identity isn't a public attribute in the item, it's the node count.
|
||
|
|
//So, return null.
|
||
|
|
return null;
|
||
|
|
},
|
||
|
|
|
||
|
|
_handleQueuedFetches: function(){
|
||
|
|
// summary:
|
||
|
|
// Internal function to execute delayed request in the store.
|
||
|
|
//Execute any deferred fetches now.
|
||
|
|
if(this._queuedFetches.length > 0){
|
||
|
|
for(var i = 0; i < this._queuedFetches.length; i++){
|
||
|
|
var fData = this._queuedFetches[i];
|
||
|
|
var delayedQuery = fData.args;
|
||
|
|
var delayedFilter = fData.filter;
|
||
|
|
if(delayedFilter){
|
||
|
|
delayedFilter(delayedQuery, this._getItemsArray(delayedQuery.queryOptions));
|
||
|
|
}else{
|
||
|
|
this.fetchItemByIdentity(delayedQuery);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
this._queuedFetches = [];
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
close: function(/*dojo.data.api.Request || keywordArgs || null */ request){
|
||
|
|
// summary:
|
||
|
|
// See dojo.data.api.Read.close()
|
||
|
|
}
|
||
|
|
});
|
||
|
|
//Mix in the simple fetch implementation to this class.
|
||
|
|
lang.extend(OpmlStore, simpleFetch);
|
||
|
|
|
||
|
|
return OpmlStore;
|
||
|
|
});
|
||
|
|
|