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283 lines
7.2 KiB
JavaScript
283 lines
7.2 KiB
JavaScript
15 years ago
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dojo.provide("dojox.data.FlickrStore");
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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.require("dojo.AdapterRegistry");
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(function(){
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var d = dojo;
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dojo.declare("dojox.data.FlickrStore", null, {
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constructor: function(/*Object*/args){
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// summary:
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// Initializer for the FlickrStore store.
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// description:
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// The FlickrStore is a Datastore interface to one of the basic services
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// of the Flickr service, the public photo feed. This does not provide
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// access to all the services of Flickr.
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// This store cannot do * and ? filtering as the flickr 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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_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.FlickrStore: 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.FlickrStore: 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 && values.length > 0){
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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 [
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"title", "description", "author", "datePublished", "dateTaken",
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"imageUrl", "imageUrlSmall", "imageUrlMedium", "tags", "link"
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];
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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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var u = d.hitch(this, "_unescapeHtml");
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var s = d.hitch(d.date.stamp, "fromISOString");
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switch(attribute){
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case "title":
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return [ u(item.title) ];
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case "author":
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return [ u(item.author) ];
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case "datePublished":
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return [ s(item.published) ];
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case "dateTaken":
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return [ s(item.date_taken) ];
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case "imageUrlSmall":
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return [ item.media.m.replace(/_m\./, "_s.") ];
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case "imageUrl":
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return [ item.media.m.replace(/_m\./, ".") ];
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case "imageUrlMedium":
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return [ item.media.m ];
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case "link":
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return [ item.link ];
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case "tags":
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return item.tags.split(" ");
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case "description":
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return [ u(item.description) ];
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default:
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return [];
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}
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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 flickr 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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var rq = request.query = request.query||{};
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//Build up the content to send the request for.
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var content = {
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format: "json",
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tagmode:"any"
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};
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d.forEach(
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[ "tags", "tagmode", "lang", "id", "ids" ],
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function(i){
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if(rq[i]){ content[i] = rq[i]; }
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}
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);
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content.id = rq.id||rq.userid||rq.groupid;
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if(rq.userids){
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content.ids = rq.userids;
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}
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//Linking this up to Flickr is a PAIN!
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var handle = null;
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var getArgs = {
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url: dojox.data.FlickrStore.urlRegistry.match(request),
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preventCache: true,
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content: content
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};
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var myHandler = d.hitch(this, function(data){
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if(!!handle){
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d.disconnect(handle);
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}
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//Process the items...
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fetchHandler(this._processFlickrData(data), request);
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});
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handle = d.connect("jsonFlickrFeed", myHandler);
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var deferred = d.io.script.get(getArgs);
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//We only set up the errback, because the callback isn't ever really used because we have
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//to link to the jsonFlickrFeed function....
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deferred.addErrback(function(error){
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d.disconnect(handle);
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errorHandler(error, request);
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});
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},
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_processFlickrData: function(data){
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var items = [];
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if(data.items){
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items = data.items;
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//Add on the store ref so that isItem can work.
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for(var i = 0; i < data.items.length; i++){
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var item = data.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(/*String*/ str){
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// summary:
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// Utility function to un-escape XML special characters in an
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// HTML string.
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// str: String.
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// The string to un-escape
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// returns:
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// HTML String converted back to the normal text (unescaped)
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// characters (<,>,&, ", etc,).
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//TODO:
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// Check to see if theres already compatible escape() in
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// dojo.string or dojo.html
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return str.replace(/&/gm, "&").
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replace(/</gm, "<").
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replace(/>/gm, ">").
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replace(/"/gm, "\"").
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replace(/'/gm, "'");
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}
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});
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dojo.extend(dojox.data.FlickrStore, dojo.data.util.simpleFetch);
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var feedsUrl = "http://api.flickr.com/services/feeds/";
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var reg = dojox.data.FlickrStore.urlRegistry = new d.AdapterRegistry(true);
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reg.register("group pool",
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function(request){ return !!request.query["groupid"]; },
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feedsUrl+"groups_pool.gne"
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);
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reg.register("default",
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function(request){ return true; },
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feedsUrl+"photos_public.gne"
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);
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})();
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//We have to define this because of how the Flickr API works.
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//This somewhat stinks, but what can you do?
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if(!jsonFlickrFeed){
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var jsonFlickrFeed = function(data){};
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}
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