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authormensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>2008-11-13 09:49:11 +0000
committermensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>2008-11-13 09:49:11 +0000
commite44a7e37b6c7b5961adaffc62b9042b8d442938e (patch)
tree95b67c356e93163467db2451f2b8cce84ed5d582 /includes/js/dojox/data/OpmlStore.js
parenta62b9742ee5e28bcec6872d88f50f25b820914f6 (diff)
downloadsemanticscuttle-e44a7e37b6c7b5961adaffc62b9042b8d442938e.tar.gz
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New feature: basic Ajax suggestion for tags and implementation of Dojo toolkit
git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@151 b3834d28-1941-0410-a4f8-b48e95affb8f
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-rw-r--r--includes/js/dojox/data/OpmlStore.js515
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+if(!dojo._hasResource["dojox.data.OpmlStore"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource["dojox.data.OpmlStore"] = true;
+dojo.provide("dojox.data.OpmlStore");
+
+dojo.require("dojo.data.util.filter");
+dojo.require("dojo.data.util.simpleFetch");
+
+dojo.declare("dojox.data.OpmlStore", null, {
+ /* summary:
+ * The OpmlStore implements the dojo.data.api.Read API.
+ */
+
+ /* examples:
+ * var opmlStore = new dojo.data.OpmlStore({url:"geography.xml"});
+ * var opmlStore = new dojo.data.OpmlStore({url:"http://example.com/geography.xml"});
+ */
+ constructor: function(/* Object */ keywordParameters){
+ // summary: constructor
+ // keywordParameters: {url: String, label: String} Where label is optional and configures what should be used as the return from getLabel()
+ this._xmlData = null;
+ this._arrayOfTopLevelItems = [];
+ this._arrayOfAllItems = [];
+ this._metadataNodes = null;
+ this._loadFinished = false;
+ this.url = keywordParameters.url;
+ this._opmlData = keywordParameters.data; // XML DOM Document
+ if(keywordParameters.label){
+ this.label = keywordParameters.label;
+ }
+ this._loadInProgress = false; //Got to track the initial load to prevent duelling loads of the dataset.
+ this._queuedFetches = [];
+ this._identityMap = {};
+ this._identCount = 0;
+ this._idProp = "_I";
+ },
+
+ label: "text",
+
+ url: "",
+
+ _assertIsItem: function(/* item */ item){
+ if(!this.isItem(item)){
+ throw new Error("dojo.data.OpmlStore: a function was passed an item argument that was not an item");
+ }
+ },
+
+ _assertIsAttribute: function(/* item || String */ attribute){
+ // summary:
+ // This function tests whether the item passed in is indeed a valid 'attribute' like type for the store.
+ // attribute:
+ // The attribute to test for being contained by the store.
+ if(!dojo.isString(attribute)){
+ throw new Error("dojox.data.OpmlStore: a function was passed an attribute argument that was not an attribute object nor an attribute name string");
+ }
+ },
+
+ _removeChildNodesThatAreNotElementNodes: function(/* node */ node, /* boolean */ recursive){
+ var childNodes = node.childNodes;
+ if(childNodes.length === 0){
+ return;
+ }
+ var nodesToRemove = [];
+ var i, childNode;
+ for(i = 0; i < childNodes.length; ++i){
+ childNode = childNodes[i];
+ if(childNode.nodeType != 1){
+ nodesToRemove.push(childNode);
+ }
+ }
+ for(i = 0; i < nodesToRemove.length; ++i){
+ childNode = nodesToRemove[i];
+ node.removeChild(childNode);
+ }
+ if(recursive){
+ for(i = 0; i < childNodes.length; ++i){
+ childNode = childNodes[i];
+ this._removeChildNodesThatAreNotElementNodes(childNode, recursive);
+ }
+ }
+ },
+
+ _processRawXmlTree: function(/* xmlDoc */ rawXmlTree){
+ this._loadFinished = true;
+ this._xmlData = rawXmlTree;
+ var headNodes = rawXmlTree.getElementsByTagName('head');
+ var headNode = headNodes[0];
+ if(headNode){
+ this._removeChildNodesThatAreNotElementNodes(headNode);
+ this._metadataNodes = headNode.childNodes;
+ }
+ var bodyNodes = rawXmlTree.getElementsByTagName('body');
+ var bodyNode = bodyNodes[0];
+ if(bodyNode){
+ this._removeChildNodesThatAreNotElementNodes(bodyNode, true);
+
+ var bodyChildNodes = bodyNodes[0].childNodes;
+ for(var i = 0; i < bodyChildNodes.length; ++i){
+ var node = bodyChildNodes[i];
+ if(node.tagName == 'outline'){
+ this._identityMap[this._identCount] = node;
+ this._identCount++;
+ this._arrayOfTopLevelItems.push(node);
+ this._arrayOfAllItems.push(node);
+ this._checkChildNodes(node);
+ }
+ }
+ }
+ },
+
+ _checkChildNodes: function(node /*Node*/){
+ // summary:
+ // Internal function to recurse over all child nodes from the store and add them
+ // As non-toplevel items
+ // description:
+ // Internal function to recurse over all child nodes from the store and add them
+ // As non-toplevel items
+ //
+ // node:
+ // The child node to walk.
+ if(node.firstChild){
+ for(var i = 0; i < node.childNodes.length; i++){
+ var child = node.childNodes[i];
+ if(child.tagName == 'outline'){
+ this._identityMap[this._identCount] = child;
+ this._identCount++;
+ this._arrayOfAllItems.push(child);
+ this._checkChildNodes(child);
+ }
+ }
+ }
+ },
+
+ _getItemsArray: function(/*object?*/queryOptions){
+ // summary:
+ // Internal function to determine which list of items to search over.
+ // queryOptions: The query options parameter, if any.
+ if(queryOptions && queryOptions.deep) {
+ return this._arrayOfAllItems;
+ }
+ return this._arrayOfTopLevelItems;
+ },
+
+/***************************************
+ dojo.data.api.Read API
+***************************************/
+ getValue: function( /* item */ item,
+ /* attribute || attribute-name-string */ attribute,
+ /* value? */ defaultValue){
+ // summary:
+ // See dojo.data.api.Read.getValue()
+ this._assertIsItem(item);
+ this._assertIsAttribute(attribute);
+ if(attribute == 'children'){
+ return (item.firstChild || defaultValue); //Object
+ } else {
+ var value = item.getAttribute(attribute);
+ return (value !== undefined) ? value : defaultValue; //Object
+ }
+ },
+
+ getValues: function(/* item */ item,
+ /* attribute || attribute-name-string */ attribute){
+ // summary:
+ // See dojo.data.api.Read.getValues()
+ this._assertIsItem(item);
+ this._assertIsAttribute(attribute);
+ var array = [];
+ if(attribute == 'children'){
+ for(var i = 0; i < item.childNodes.length; ++i){
+ array.push(item.childNodes[i]);
+ }
+ } else if(item.getAttribute(attribute) !== null){
+ array.push(item.getAttribute(attribute));
+ }
+ return array; // Array
+ },
+
+ getAttributes: function(/* item */ item){
+ // summary:
+ // See dojo.data.api.Read.getAttributes()
+ this._assertIsItem(item);
+ var attributes = [];
+ var xmlNode = item;
+ var xmlAttributes = xmlNode.attributes;
+ for(var i = 0; i < xmlAttributes.length; ++i){
+ var xmlAttribute = xmlAttributes.item(i);
+ attributes.push(xmlAttribute.nodeName);
+ }
+ if(xmlNode.childNodes.length > 0){
+ attributes.push('children');
+ }
+ return attributes; //Array
+ },
+
+ hasAttribute: function( /* item */ item,
+ /* attribute || attribute-name-string */ attribute){
+ // summary:
+ // See dojo.data.api.Read.hasAttribute()
+ return (this.getValues(item, attribute).length > 0); //Boolean
+ },
+
+ containsValue: function(/* item */ item,
+ /* attribute || attribute-name-string */ attribute,
+ /* anything */ value){
+ // summary:
+ // See dojo.data.api.Read.containsValue()
+ var regexp = undefined;
+ if(typeof value === "string"){
+ regexp = dojo.data.util.filter.patternToRegExp(value, false);
+ }
+ return this._containsValue(item, attribute, value, regexp); //boolean.
+ },
+
+ _containsValue: function( /* item */ item,
+ /* attribute || attribute-name-string */ attribute,
+ /* anything */ value,
+ /* RegExp?*/ regexp){
+ // summary:
+ // Internal function for looking at the values contained by the item.
+ // description:
+ // Internal function for looking at the values contained by the item. This
+ // function allows for denoting if the comparison should be case sensitive for
+ // strings or not (for handling filtering cases where string case should not matter)
+ //
+ // item:
+ // The data item to examine for attribute values.
+ // attribute:
+ // The attribute to inspect.
+ // value:
+ // The value to match.
+ // regexp:
+ // Optional regular expression generated off value if value was of string type to handle wildcarding.
+ // If present and attribute values are string, then it can be used for comparison instead of 'value'
+ var values = this.getValues(item, attribute);
+ for(var i = 0; i < values.length; ++i){
+ var possibleValue = values[i];
+ if(typeof possibleValue === "string" && regexp){
+ return (possibleValue.match(regexp) !== null);
+ }else{
+ //Non-string matching.
+ if(value === possibleValue){
+ return true; // Boolean
+ }
+ }
+ }
+ return false; // Boolean
+ },
+
+ isItem: function(/* anything */ something){
+ // summary:
+ // See dojo.data.api.Read.isItem()
+ // description:
+ // Four things are verified to ensure that "something" is an item:
+ // something can not be null, the nodeType must be an XML Element,
+ // the tagName must be "outline", and the node must be a member of
+ // XML document for this datastore.
+ return (something &&
+ something.nodeType == 1 &&
+ something.tagName == 'outline' &&
+ something.ownerDocument === this._xmlData); //Boolean
+ },
+
+ isItemLoaded: function(/* anything */ something){
+ // summary:
+ // See dojo.data.api.Read.isItemLoaded()
+ // OpmlStore loads every item, so if it's an item, then it's loaded.
+ return this.isItem(something); //Boolean
+ },
+
+ loadItem: function(/* item */ item){
+ // summary:
+ // See dojo.data.api.Read.loadItem()
+ // description:
+ // The OpmlStore always loads all items, so if it's an item, then it's loaded.
+ // From the dojo.data.api.Read.loadItem docs:
+ // If a call to isItemLoaded() returns true before loadItem() is even called,
+ // then loadItem() need not do any work at all and will not even invoke the callback handlers.
+ },
+
+ getLabel: function(/* item */ item){
+ // summary:
+ // See dojo.data.api.Read.getLabel()
+ if(this.isItem(item)){
+ return this.getValue(item,this.label); //String
+ }
+ return undefined; //undefined
+ },
+
+ getLabelAttributes: function(/* item */ item){
+ // summary:
+ // See dojo.data.api.Read.getLabelAttributes()
+ return [this.label]; //array
+ },
+
+ // The dojo.data.api.Read.fetch() function is implemented as
+ // a mixin from dojo.data.util.simpleFetch.
+ // That mixin requires us to define _fetchItems().
+ _fetchItems: function( /* Object */ keywordArgs,
+ /* Function */ findCallback,
+ /* Function */ errorCallback){
+ // summary:
+ // See dojo.data.util.simpleFetch.fetch()
+
+ var self = this;
+ var filter = function(requestArgs, arrayOfItems){
+ var items = null;
+ if(requestArgs.query){
+ items = [];
+ var ignoreCase = requestArgs.queryOptions ? requestArgs.queryOptions.ignoreCase : false;
+
+ //See if there are any string values that can be regexp parsed first to avoid multiple regexp gens on the
+ //same value for each item examined. Much more efficient.
+ var regexpList = {};
+ for(var key in requestArgs.query){
+ var value = requestArgs.query[key];
+ if(typeof value === "string"){
+ regexpList[key] = dojo.data.util.filter.patternToRegExp(value, ignoreCase);
+ }
+ }
+
+ for(var i = 0; i < arrayOfItems.length; ++i){
+ var match = true;
+ var candidateItem = arrayOfItems[i];
+ for(var key in requestArgs.query){
+ var value = requestArgs.query[key];
+ if(!self._containsValue(candidateItem, key, value, regexpList[key])){
+ match = false;
+ }
+ }
+ if(match){
+ items.push(candidateItem);
+ }
+ }
+ }else{
+ // We want a copy to pass back in case the parent wishes to sort the array. We shouldn't allow resort
+ // of the internal list so that multiple callers can get lists and sort without affecting each other.
+ if(arrayOfItems.length> 0){
+ items = arrayOfItems.slice(0,arrayOfItems.length);
+ }
+ }
+ findCallback(items, requestArgs);
+ };
+
+ if(this._loadFinished){
+ filter(keywordArgs, this._getItemsArray(keywordArgs.queryOptions));
+ }else{
+
+ //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, filter: filter});
+ }else{
+ if(this.url !== ""){
+ this._loadInProgress = true;
+ var getArgs = {
+ url: self.url,
+ handleAs: "xml"
+ };
+ var getHandler = dojo.xhrGet(getArgs);
+ getHandler.addCallback(function(data){
+ 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 = dojo.xhrGet(getArgs);
+ getHandler.addCallback(function(data){
+ var scope = keywordArgs.scope?keywordArgs.scope:dojo.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:dojo.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:dojo.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:dojo.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.
+dojo.extend(dojox.data.OpmlStore,dojo.data.util.simpleFetch);
+
+
+}