dojo_app/js/library/dojo/store/JsonRest.js

define(["../_base/xhr", "../_base/lang", "../json", "../_base/declare", "./util/QueryResults" /*=====, "./api/Store" =====*/
], function(xhr, lang, JSON, declare, QueryResults /*=====, Store =====*/){

// No base class, but for purposes of documentation, the base class is dojo/store/api/Store
var base = null;
/*===== base = Store; =====*/

/*=====
var __HeaderOptions = {
		// headers: Object?
		//		Additional headers to send along with the request.
	},
	__PutDirectives = declare(Store.PutDirectives, __HeaderOptions),
	__QueryOptions = declare(Store.QueryOptions, __HeaderOptions);
=====*/

return declare("dojo.store.JsonRest", base, {
	// summary:
	//		This is a basic store for RESTful communicating with a server through JSON
	//		formatted data. It implements dojo/store/api/Store.

	constructor: function(options){
		// summary:
		//		This is a basic store for RESTful communicating with a server through JSON
		//		formatted data.
		// options: dojo/store/JsonRest
		//		This provides any configuration information that will be mixed into the store
		this.headers = {};
		declare.safeMixin(this, options);
	},

	// headers: Object
	//		Additional headers to pass in all requests to the server. These can be overridden
	//		by passing additional headers to calls to the store.
	headers: {},

	// target: String
	//		The target base URL to use for all requests to the server. This string will be
	//		prepended to the id to generate the URL (relative or absolute) for requests
	//		sent to the server
	target: "",

	// idProperty: String
	//		Indicates the property to use as the identity property. The values of this
	//		property should be unique.
	idProperty: "id",

	// rangeParam: String
	//		Use a query parameter for the requested range. If this is omitted, than the
	//		Range header will be used. Independent of this, the X-Range header is always set.

	// sortParam: String
	//		The query parameter to used for holding sort information. If this is omitted, than
	//		the sort information is included in a functional query token to avoid colliding
	//		with the set of name/value pairs.

	// ascendingPrefix: String
	//		The prefix to apply to sort attribute names that are ascending
	ascendingPrefix: "+",

	// descendingPrefix: String
	//		The prefix to apply to sort attribute names that are ascending
	descendingPrefix: "-",

	_getTarget: function(id){
		// summary:
		//		If the target has no trailing '/', then append it.
		// id: Number
		//		The identity of the requested target
		var target = this.target;
		if(typeof id != "undefined"){
			if( (target.charAt(target.length-1) == '/') || (target.charAt(target.length-1) == '=')){
				target += id;
			}else{
				target += '/' + id;
			}
		}
		return target;
	},

	get: function(id, options){
		// summary:
		//		Retrieves an object by its identity. This will trigger a GET request to the server using
		//		the url `this.target + id`.
		// id: Number
		//		The identity to use to lookup the object
		// options: Object?
		//		HTTP headers. For consistency with other methods, if a `headers` key exists on this object, it will be
		//		used to provide HTTP headers instead.
		// returns: Object
		//		The object in the store that matches the given id.
		options = options || {};
		var headers = lang.mixin({ Accept: this.accepts }, this.headers, options.headers || options);
		return xhr("GET", {
			url: this._getTarget(id),
			handleAs: "json",
			headers: headers,
			timeout: options && options.timeout
		});
	},

	// accepts: String
	//		Defines the Accept header to use on HTTP requests
	accepts: "application/javascript, application/json",

	getIdentity: function(object){
		// summary:
		//		Returns an object's identity
		// object: Object
		//		The object to get the identity from
		// returns: Number
		return object[this.idProperty];
	},

	put: function(object, options){
		// summary:
		//		Stores an object. This will trigger a PUT request to the server
		//		if the object has an id, otherwise it will trigger a POST request.
		// object: Object
		//		The object to store.
		// options: __PutDirectives?
		//		Additional metadata for storing the data.  Includes an "id"
		//		property if a specific id is to be used.
		// returns: dojo/_base/Deferred
		options = options || {};
		var id = ("id" in options) ? options.id : this.getIdentity(object);
		var hasId = typeof id != "undefined";
		return xhr(hasId && !options.incremental ? "PUT" : "POST", {
				url: this._getTarget(id),
				postData: JSON.stringify(object),
				handleAs: "json",
				headers: lang.mixin({
					"Content-Type": "application/json",
					Accept: this.accepts,
					"If-Match": options.overwrite === true ? "*" : null,
					"If-None-Match": options.overwrite === false ? "*" : null
				}, this.headers, options.headers),
				timeout: options && options.timeout
			});
	},

	add: function(object, options){
		// summary:
		//		Adds an object. This will trigger a PUT request to the server
		//		if the object has an id, otherwise it will trigger a POST request.
		// object: Object
		//		The object to store.
		// options: __PutDirectives?
		//		Additional metadata for storing the data.  Includes an "id"
		//		property if a specific id is to be used.
		options = options || {};
		options.overwrite = false;
		return this.put(object, options);
	},

	remove: function(id, options){
		// summary:
		//		Deletes an object by its identity. This will trigger a DELETE request to the server.
		// id: Number
		//		The identity to use to delete the object
		// options: __HeaderOptions?
		//		HTTP headers.
		options = options || {};
		return xhr("DELETE", {
			url: this._getTarget(id),
			headers: lang.mixin({}, this.headers, options.headers),
			timeout: options && options.timeout
		});
	},

	query: function(query, options){
		// summary:
		//		Queries the store for objects. This will trigger a GET request to the server, with the
		//		query added as a query string.
		// query: Object
		//		The query to use for retrieving objects from the store.
		// options: __QueryOptions?
		//		The optional arguments to apply to the resultset.
		// returns: dojo/store/api/Store.QueryResults
		//		The results of the query, extended with iterative methods.
		options = options || {};

		var headers = lang.mixin({ Accept: this.accepts }, this.headers, options.headers);

		var hasQuestionMark = this.target.indexOf("?") > -1;
		query = query || ""; // https://bugs.dojotoolkit.org/ticket/17628
		if(query && typeof query == "object"){
			query = xhr.objectToQuery(query);
			query = query ? (hasQuestionMark ? "&" : "?") + query: "";
		}
		if(options.start >= 0 || options.count >= 0){
			headers["X-Range"] = "items=" + (options.start || '0') + '-' +
				(("count" in options && options.count != Infinity) ?
					(options.count + (options.start || 0) - 1) : '');
			if(this.rangeParam){
				query += (query || hasQuestionMark ? "&" : "?") + this.rangeParam + "=" + headers["X-Range"];
				hasQuestionMark = true;
			}else{
				headers.Range = headers["X-Range"];
			}
		}
		if(options && options.sort){
			var sortParam = this.sortParam;
			query += (query || hasQuestionMark ? "&" : "?") + (sortParam ? sortParam + '=' : "sort(");
			for(var i = 0; i<options.sort.length; i++){
				var sort = options.sort[i];
				query += (i > 0 ? "," : "") + (sort.descending ? this.descendingPrefix : this.ascendingPrefix) + encodeURIComponent(sort.attribute);
			}
			if(!sortParam){
				query += ")";
			}
		}
		var results = xhr("GET", {
			url: this.target + (query || ""),
			handleAs: "json",
			headers: headers,
			timeout: options && options.timeout
		});
		results.total = results.then(function(){
			var range = results.ioArgs.xhr.getResponseHeader("Content-Range");
			if (!range){
				// At least Chrome drops the Content-Range header from cached replies.
				range = results.ioArgs.xhr.getResponseHeader("X-Content-Range");
			}
			return range && (range = range.match(/\/(.*)/)) && +range[1];
		});
		return QueryResults(results);
	}
});

});