360 lines
9.6 KiB
JavaScript
360 lines
9.6 KiB
JavaScript
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dojo.provide("dojox.data.OpenSearchStore");
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dojo.require("dojo.data.util.simpleFetch");
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dojo.require("dojox.xml.DomParser");
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dojo.require("dojox.xml.parser");
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dojo.experimental("dojox.data.OpenSearchStore");
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dojo.declare("dojox.data.OpenSearchStore", null, {
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constructor: function(/*Object*/args){
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// summary:
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// Initializer for the OpenSearchStore store.
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// description:
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// The OpenSearchStore is a Datastore interface to any search
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// engine that implements the open search specifications.
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if(args){
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this.label = args.label;
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this.url = args.url;
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this.itemPath = args.itemPath;
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}
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var def = dojo.xhrGet({
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url: this.url,
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handleAs: "xml",
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sync: true
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});
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def.addCallback(this, "_processOsdd");
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def.addErrback(function() {
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throw new Error("Unable to load OpenSearch Description document from " . args.url);
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});
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},
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// URL to the open search description document
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url: "",
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itemPath: "",
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_storeRef: "_S",
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urlElement: null,
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iframeElement: null,
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ATOM_CONTENT_TYPE: 3,
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ATOM_CONTENT_TYPE_STRING: "atom",
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RSS_CONTENT_TYPE: 2,
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RSS_CONTENT_TYPE_STRING: "rss",
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XML_CONTENT_TYPE: 1,
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XML_CONTENT_TYPE_STRING: "xml",
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_assertIsItem: function(/* item */ item){
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// summary:
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// This function tests whether the item passed in is indeed an item in the store.
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// item:
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// The item to test for being contained by the store.
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if(!this.isItem(item)){
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throw new Error("dojox.data.OpenSearchStore: 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(/* attribute-name-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(typeof attribute !== "string"){
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throw new Error("dojox.data.OpenSearchStore: a function was passed an attribute argument that was not an attribute name string");
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}
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},
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getFeatures: function(){
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// summary:
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// See dojo.data.api.Read.getFeatures()
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return {
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'dojo.data.api.Read': true
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};
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},
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getValue: function(item, attribute, defaultValue){
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// summary:
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// See dojo.data.api.Read.getValue()
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var values = this.getValues(item, attribute);
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if(values){
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return values[0];
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}
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return defaultValue;
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},
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getAttributes: function(item){
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// summary:
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// See dojo.data.api.Read.getAttributes()
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return ["content"];
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},
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hasAttribute: function(item, attribute){
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// summary:
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// See dojo.data.api.Read.hasAttributes()
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if(this.getValue(item,attribute)){
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return true;
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}
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return false;
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},
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isItemLoaded: function(item){
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// summary:
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// See dojo.data.api.Read.isItemLoaded()
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return this.isItem(item);
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},
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loadItem: function(keywordArgs){
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// summary:
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// See dojo.data.api.Read.loadItem()
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},
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getLabel: function(item){
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// summary:
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// See dojo.data.api.Read.getLabel()
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return undefined;
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},
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getLabelAttributes: function(item){
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// summary:
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// See dojo.data.api.Read.getLabelAttributes()
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return null;
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},
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containsValue: function(item, attribute, value){
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// summary:
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// See dojo.data.api.Read.containsValue()
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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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if(values[i] === value){
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return true;
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}
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}
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return false;
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},
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getValues: function(item, attribute){
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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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var value = this.processItem(item, attribute);
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if(value){
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return [value];
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}
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return undefined;
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},
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isItem: function(item){
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// summary:
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// See dojo.data.api.Read.isItem()
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if(item && item[this._storeRef] === this){
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return true;
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}
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return false;
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},
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close: function(request){
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// summary:
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// See dojo.data.api.Read.close()
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},
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process: function(data){
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// This should return an array of items. This would be the function to override if the
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// developer wanted to customize the processing/parsing of the entire batch of search
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// results.
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return this["_processOSD"+this.contentType](data);
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},
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processItem: function(item, attribute){
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// This returns the text that represents the item. If a developer wanted to customize
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// how an individual item is rendered/parsed, they'd override this function.
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return this["_processItem"+this.contentType](item.node, attribute);
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},
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_createSearchUrl: function(request){
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var template = this.urlElement.attributes.getNamedItem("template").nodeValue;
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var attrs = this.urlElement.attributes;
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var index = template.indexOf("{searchTerms}");
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template = template.substring(0, index) + request.query.searchTerms + template.substring(index+13);
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dojo.forEach([ {'name': 'count', 'test': request.count, 'def': '10'},
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{'name': 'startIndex', 'test': request.start, 'def': this.urlElement.attributes.getNamedItem("indexOffset")?this.urlElement.attributes.getNamedItem("indexOffset").nodeValue:0},
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{'name': 'startPage', 'test': request.startPage, 'def': this.urlElement.attributes.getNamedItem("pageOffset")?this.urlElement.attributes.getNamedItem("pageOffset").nodeValue:0},
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{'name': 'language', 'test': request.language, 'def': "*"},
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{'name': 'inputEncoding', 'test': request.inputEncoding, 'def': 'UTF-8'},
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{'name': 'outputEncoding', 'test': request.outputEncoding, 'def': 'UTF-8'}
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], function(item){
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template = template.replace('{'+item.name+'}', item.test || item.def);
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template = template.replace('{'+item.name+'?}', item.test || item.def);
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});
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return template;
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},
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_fetchItems: function(request, fetchHandler, errorHandler){
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// summary:
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// Fetch OpenSearch items that match to a query
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// request:
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// A request object
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// fetchHandler:
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// A function to call for fetched items
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// errorHandler:
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// A function to call on error
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if(!request.query){
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request.query={};
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}
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//Build up the content using information from the request
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var self = this;
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var url = this._createSearchUrl(request);
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var getArgs = {
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url: url,
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preventCache: true
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};
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// Change to fetch the query results.
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var xhr = dojo.xhrGet(getArgs);
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xhr.addErrback(function(error){
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errorHandler(error, request);
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});
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xhr.addCallback(function(data){
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var items = [];
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if(data) {
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//Process the items...
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items = self.process(data);
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for(var i=0; i < items.length; i++){
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items[i] = {node: items[i]};
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items[i][self._storeRef] = self;
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}
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}
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fetchHandler(items, request);
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});
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},
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_processOSDxml: function(data){
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var div = dojo.doc.createElement("div");
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div.innerHTML = data;
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return dojo.query(this.itemPath, div);
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},
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_processItemxml: function(item, attribute){
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if(attribute === "content"){
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return item.innerHTML;
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}
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return undefined;
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},
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_processOSDatom: function(data){
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return this._processOSDfeed(data, "entry");
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},
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_processItematom: function(item, attribute){
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return this._processItemfeed(item, attribute, "content");
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},
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_processOSDrss: function(data){
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return this._processOSDfeed(data, "item");
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},
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_processItemrss: function(item, attribute){
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return this._processItemfeed(item, attribute, "description");
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},
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_processOSDfeed: function(data, type){
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data = dojox.xml.parser.parse(data);
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var items = [];
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var nodeList = data.getElementsByTagName(type);
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for(var i=0; i<nodeList.length; i++){
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items.push(nodeList.item(i));
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}
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return items;
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},
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_processItemfeed: function(item, attribute, type){
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if(attribute === "content"){
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var content = item.getElementsByTagName(type).item(0);
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return this._getNodeXml(content, true);
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}
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return undefined;
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},
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_getNodeXml: function(node, skipFirst){
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var i;
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switch(node.nodeType) {
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case 1:
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var xml = [];
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if(!skipFirst) {
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xml.push("<"+node.tagName);
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var attr;
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for(i=0; i<node.attributes.length; i++){
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attr = node.attributes.item(i);
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xml.push(" "+attr.nodeName+"=\""+attr.nodeValue+"\"");
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}
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xml.push(">");
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}
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for(i=0; i<node.childNodes.length; i++){
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xml.push(this._getNodeXml(node.childNodes.item(i)));
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}
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if(!skipFirst){
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xml.push("</"+node.tagName+">\n");
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}
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return xml.join("");
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case 3:
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case 4:
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return node.nodeValue;
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}
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return undefined;
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},
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_processOsdd: function(doc){
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var urlnodes = doc.getElementsByTagName("Url");
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//TODO: Check all the urlnodes and determine what our best one is...
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var types = [];
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var contentType;
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var i;
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for(i=0; i<urlnodes.length; i++){
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contentType = urlnodes[i].attributes.getNamedItem("type").nodeValue;
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switch(contentType){
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case "application/rss+xml":
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types[i] = this.RSS_CONTENT_TYPE;
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break;
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case "application/atom+xml":
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types[i] = this.ATOM_CONTENT_TYPE;
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break;
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default:
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types[i] = this.XML_CONTENT_TYPE;
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break;
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}
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}
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var index = 0;
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var currentType = types[0];
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for(i=1; i<urlnodes.length; i++){
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if(types[i]>currentType) {
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index = i;
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currentType = types[i];
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}
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}
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// We'll be using urlnodes[index] as it's the best option (ATOM > RSS > XML)
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var label = urlnodes[index].nodeName.toLowerCase();
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if(label == 'url'){
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var urlattrs = urlnodes[index].attributes;
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this.urlElement = urlnodes[index];
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switch(types[index]){
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case this.ATOM_CONTENT_TYPE:
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this.contentType = this.ATOM_CONTENT_TYPE_STRING;
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break;
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case this.RSS_CONTENT_TYPE:
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this.contentType = this.RSS_CONTENT_TYPE_STRING;
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break;
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case this.XML_CONTENT_TYPE:
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this.contentType = this.XML_CONTENT_TYPE_STRING;
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break;
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}
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}
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}
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});
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dojo.extend(dojox.data.OpenSearchStore,dojo.data.util.simpleFetch);
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