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PicasaStore.js
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PicasaStore.js
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if(!dojo._hasResource["dojox.data.PicasaStore"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.data.PicasaStore"] = true;
dojo.provide("dojox.data.PicasaStore");
dojo.require("dojo.data.util.simpleFetch");
dojo.require("dojo.io.script");
dojo.require("dojo.date.stamp");
dojo.declare("dojox.data.PicasaStore", null, {
constructor: function(/*Object*/args){
// summary:
// Initializer for the PicasaStore store.
// description:
// The PicasaStore is a Datastore interface to one of the basic services
// of the Picasa service, the public photo feed. This does not provide
// access to all the services of Picasa.
// This store cannot do * and ? filtering as the picasa service
// provides no interface for wildcards.
if(args && args.label){
this.label = args.label;
}
},
_picasaUrl: "http://picasaweb.google.com/data/feed/api/all",
_storeRef: "_S",
label: "title",
_assertIsItem: function(/* item */ item){
// summary:
// This function tests whether the item passed in is indeed an item in the store.
// item:
// The item to test for being contained by the store.
if(!this.isItem(item)){
throw new Error("dojox.data.PicasaStore: a function was passed an item argument that was not an item");
}
},
_assertIsAttribute: function(/* attribute-name-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(typeof attribute !== "string"){
throw new Error("dojox.data.PicasaStore: a function was passed an attribute argument that was not an attribute name string");
}
},
getFeatures: function(){
// summary:
// See dojo.data.api.Read.getFeatures()
return {
'dojo.data.api.Read': true
};
},
getValue: function(item, attribute){
// summary:
// See dojo.data.api.Read.getValue()
var values = this.getValues(item, attribute);
if(values){
return values[0];
}
return undefined;
},
getAttributes: function(item){
// summary:
// See dojo.data.api.Read.getAttributes()
return ["id", "published", "updated", "category", "title$type", "title", "summary$type", "summary", "rights$type", "rights", "link", "author", "gphoto$id", "gphoto$name", "location"];
},
hasAttribute: function(item, attribute){
// summary:
// See dojo.data.api.Read.hasAttributes()
if(this.getValue(item,attribute)){
return true;
}
return false;
},
isItemLoaded: function(item){
// summary:
// See dojo.data.api.Read.isItemLoaded()
return this.isItem(item);
},
loadItem: function(keywordArgs){
// summary:
// See dojo.data.api.Read.loadItem()
},
getLabel: function(item){
// summary:
// See dojo.data.api.Read.getLabel()
return this.getValue(item,this.label);
},
getLabelAttributes: function(item){
// summary:
// See dojo.data.api.Read.getLabelAttributes()
return [this.label];
},
containsValue: function(item, attribute, value){
// summary:
// See dojo.data.api.Read.containsValue()
var values = this.getValues(item,attribute);
for(var i = 0; i < values.length; i++){
if(values[i] === value){
return true;
}
}
return false;
},
getValues: function(item, attribute){
// summary:
// See dojo.data.api.Read.getValue()
this._assertIsItem(item);
this._assertIsAttribute(attribute);
if(attribute === "title"){
return [this._unescapeHtml(item.title)];
}else if(attribute === "author"){
return [this._unescapeHtml(item.author[0].name)];
}else if(attribute === "datePublished"){
return [dojo.date.stamp.fromISOString(item.published)];
}else if(attribute === "dateTaken"){
return [dojo.date.stamp.fromISOString(item.date_taken)];
}else if(attribute === "imageUrlSmall"){
return [item.media.thumbnail[1].url];
}else if(attribute === "imageUrl"){
return [item.content$src];
}else if(attribute === "imageUrlMedium"){
return [item.media.thumbnail[2].url];
}else if(attribute === "link"){
return [item.link[1]];
}else if(attribute === "tags"){
return item.tags.split(" ");
}else if(attribute === "description"){
return [this._unescapeHtml(item.summary)];
}
return undefined;
},
isItem: function(item){
// summary:
// See dojo.data.api.Read.isItem()
if(item && item[this._storeRef] === this){
return true;
}
return false;
},
close: function(request){
// summary:
// See dojo.data.api.Read.close()
},
_fetchItems: function(request, fetchHandler, errorHandler){
// summary:
// Fetch picasa items that match to a query
// request:
// A request object
// fetchHandler:
// A function to call for fetched items
// errorHandler:
// A function to call on error
if(!request.query){
request.query={};
}
//Build up the content to send the request for.
var content = {alt: "jsonm", pp: "1", psc: "G"};
content['start-index'] = "1";
if(request.query.start){
content['start-index'] = request.query.start;
}
if(request.query.tags){
content.q = request.query.tags;
}
if(request.query.userid){
content.uname = request.query.userid;
}
if(request.query.userids){
content.ids = request.query.userids;
}
if(request.query.lang){
content.hl = request.query.lang;
}
if(request.count){
content['max-results'] = request.count;
}else{
content['max-results'] = "20";
}
//Linking this up to Picasa is a JOY!
var self = this;
var handle = null;
var myHandler = function(data){
if(handle !== null){
dojo.disconnect(handle);
}
//Process the items...
fetchHandler(self._processPicasaData(data), request);
};
var getArgs = {
url: this._picasaUrl,
// preventCache: true,
content: content,
callbackParamName: 'callback',
handle: myHandler
};
var deferred = dojo.io.script.get(getArgs);
deferred.addErrback(function(error){
dojo.disconnect(handle);
errorHandler(error, request);
});
},
_processPicasaData: function(data){
var items = [];
if(data.feed){
items = data.feed.entry;
//Add on the store ref so that isItem can work.
for(var i = 0; i < items.length; i++){
var item = items[i];
item[this._storeRef] = this;
}
}
return items;
},
_unescapeHtml: function(str){
// summary: Utility function to un-escape XML special characters in an HTML string.
// description: Utility function to un-escape XML special characters in an HTML string.
// str: String.
// The string to un-escape
// returns: HTML String converted back to the normal text (unescaped) characters (<,>,&, ", etc,).
//
//TODO: Check to see if theres already compatible escape() in dojo.string or dojo.html
str = str.replace(/&amp;/gm, "&").replace(/&lt;/gm, "<").replace(/&gt;/gm, ">").replace(/&quot;/gm, "\"");
str = str.replace(/&#39;/gm, "'");
return str;
}
});
dojo.extend(dojox.data.PicasaStore,dojo.data.util.simpleFetch);
}

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PicasaStore.js (6 KB)

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