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mathias |
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if(!dojo._hasResource["dojox.data.PicasaStore"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojox.data.PicasaStore"] = true;
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dojo.provide("dojox.data.PicasaStore");
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dojo.require("dojo.data.util.simpleFetch");
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dojo.require("dojo.io.script");
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dojo.require("dojo.date.stamp");
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dojo.declare("dojox.data.PicasaStore", null, {
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constructor: function(/*Object*/args){
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// summary:
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// Initializer for the PicasaStore store.
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// description:
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// The PicasaStore is a Datastore interface to one of the basic services
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// of the Picasa service, the public photo feed. This does not provide
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// access to all the services of Picasa.
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// This store cannot do * and ? filtering as the picasa service
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// provides no interface for wildcards.
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if(args && args.label){
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this.label = args.label;
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}
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},
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_picasaUrl: "http://picasaweb.google.com/data/feed/api/all",
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_storeRef: "_S",
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label: "title",
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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.PicasaStore: 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.PicasaStore: 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){
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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 undefined;
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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 ["id", "published", "updated", "category", "title$type", "title", "summary$type", "summary", "rights$type", "rights", "link", "author", "gphoto$id", "gphoto$name", "location"];
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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 this.getValue(item,this.label);
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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 [this.label];
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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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if(attribute === "title"){
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return [this._unescapeHtml(item.title)];
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}else if(attribute === "author"){
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return [this._unescapeHtml(item.author[0].name)];
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}else if(attribute === "datePublished"){
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return [dojo.date.stamp.fromISOString(item.published)];
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}else if(attribute === "dateTaken"){
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return [dojo.date.stamp.fromISOString(item.date_taken)];
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}else if(attribute === "imageUrlSmall"){
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return [item.media.thumbnail[1].url];
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}else if(attribute === "imageUrl"){
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return [item.content$src];
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}else if(attribute === "imageUrlMedium"){
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return [item.media.thumbnail[2].url];
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}else if(attribute === "link"){
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return [item.link[1]];
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}else if(attribute === "tags"){
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return item.tags.split(" ");
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}else if(attribute === "description"){
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return [this._unescapeHtml(item.summary)];
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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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_fetchItems: function(request, fetchHandler, errorHandler){
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// summary:
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// Fetch picasa 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 to send the request for.
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var content = {alt: "jsonm", pp: "1", psc: "G"};
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content['start-index'] = "1";
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if(request.query.start){
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content['start-index'] = request.query.start;
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}
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if(request.query.tags){
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content.q = request.query.tags;
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}
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if(request.query.userid){
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content.uname = request.query.userid;
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}
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if(request.query.userids){
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content.ids = request.query.userids;
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}
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if(request.query.lang){
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content.hl = request.query.lang;
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}
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if(request.count){
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content['max-results'] = request.count;
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}else{
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content['max-results'] = "20";
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}
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//Linking this up to Picasa is a JOY!
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var self = this;
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var handle = null;
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var myHandler = function(data){
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if(handle !== null){
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dojo.disconnect(handle);
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}
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//Process the items...
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fetchHandler(self._processPicasaData(data), request);
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};
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var getArgs = {
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url: this._picasaUrl,
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// preventCache: true,
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content: content,
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callbackParamName: 'callback',
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handle: myHandler
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};
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var deferred = dojo.io.script.get(getArgs);
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deferred.addErrback(function(error){
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dojo.disconnect(handle);
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errorHandler(error, request);
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});
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},
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_processPicasaData: function(data){
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var items = [];
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if(data.feed){
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items = data.feed.entry;
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//Add on the store ref so that isItem can work.
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for(var i = 0; i < items.length; i++){
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var item = items[i];
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item[this._storeRef] = this;
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}
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}
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return items;
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},
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_unescapeHtml: function(str){
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// summary: Utility function to un-escape XML special characters in an HTML string.
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// description: Utility function to un-escape XML special characters in an HTML string.
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// str: String.
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// The string to un-escape
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// returns: HTML String converted back to the normal text (unescaped) characters (<,>,&, ", etc,).
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//
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//TODO: Check to see if theres already compatible escape() in dojo.string or dojo.html
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str = str.replace(/&/gm, "&").replace(/</gm, "<").replace(/>/gm, ">").replace(/"/gm, "\"");
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str = str.replace(/'/gm, "'");
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return str;
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}
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});
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dojo.extend(dojox.data.PicasaStore,dojo.data.util.simpleFetch);
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}
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