text: define("dojox/data/QueryReadStore", ["dojo", "dojox", "dojo/data/util/sorter", "dojo/string"], function(dojo, dojox) {
  
  dojo.declare("dojox.data.QueryReadStore",
  	null,
  	{
  		// summary:
  		//		This class provides a store that is mainly intended to be used
  		//		for loading data dynamically from the server, used i.e. for
  		//		retrieving chunks of data from huge data stores on the server (by server-side filtering!).
  		//		Upon calling the fetch() method of this store the data are requested from
  		//		the server if they are not yet loaded for paging (or cached).
  		//
  		//		For example used for a combobox which works on lots of data. It
  		//		can be used to retrieve the data partially upon entering the
  		//		letters "ac" it returns only items like "action", "acting", etc.
  		//
  		//		note:
  		//		The field name "id" in a query is reserved for looking up data
  		//		by id. This is necessary as before the first fetch, the store
  		//		has no way of knowing which field the server will declare as
  		//		identifier.
  		//
  		// example:
  		// |	// The parameter "query" contains the data that are sent to the server.
  		// |	var store = new dojox.data.QueryReadStore({url:'/search.php'});
  		// |	store.fetch({query:{name:'a'}, queryOptions:{ignoreCase:false}});
  		//
  		// |	// Since "serverQuery" is given, it overrules and those data are
  		// |	// sent to the server.
  		// |	var store = new dojox.data.QueryReadStore({url:'/search.php'});
  		// |	store.fetch({serverQuery:{name:'a'}, queryOptions:{ignoreCase:false}});
  		//
  		// |	<div dojoType="dojox.data.QueryReadStore"
  		// |		jsId="store2"
  		// |		url="../tests/stores/QueryReadStore.php"
  		// |		requestMethod="post"></div>
  		// |	<div dojoType="dojox.grid.data.DojoData"
  		// |		jsId="model2"
  		// |		store="store2"
  		// |		sortFields="[{attribute: 'name', descending: true}]"
  		// |		rowsPerPage="30"></div>
  		// |	<div dojoType="dojox.Grid" id="grid2"
  		// |		model="model2"
  		// |		structure="gridLayout"
  		// |		style="height:300px; width:800px;"></div>
  
  		// todo:
  		//		- there is a bug in the paging, when i set start:2, count:5 after an initial fetch() and doClientPaging:true
  		//		  it returns 6 elemetns, though count=5, try it in QueryReadStore.html
  		//		- add optional caching
  		//		- when the first query searched for "a" and the next for a subset of
  		//		  the first, i.e. "ab" then we actually dont need a server request, if
  		//		  we have client paging, we just need to filter the items we already have
  		//		  that might also be tooo much logic
  		
  		url:"",
  		requestMethod:"get",
  		//useCache:false,
  		
  		// We use the name in the errors, once the name is fixed hardcode it, may be.
  		_className:"dojox.data.QueryReadStore",
  		
  		// This will contain the items we have loaded from the server.
  		// The contents of this array is optimized to satisfy all read-api requirements
  		// and for using lesser storage, so the keys and their content need some explaination:
  		//		this._items[0].i - the item itself
  		//		this._items[0].r - a reference to the store, so we can identify the item
  		//			securely. We set this reference right after receiving the item from the
  		//			server.
  		_items:[],
  		
  		// Store the last query that triggered xhr request to the server.
  		// So we can compare if the request changed and if we shall reload
  		// (this also depends on other factors, such as is caching used, etc).
  		_lastServerQuery:null,
  		
  		// Store how many rows we have so that we can pass it to a clientPaging handler
  		_numRows:-1,
  		
  		// Store a hash of the last server request. Actually I introduced this
  		// for testing, so I can check if no unnecessary requests were issued for
  		// client-side-paging.
  		lastRequestHash:null,
  		
  		// doClientPaging: Boolean
  		//		By default every request for paging is sent to the server.
  		doClientPaging:false,
  	
  		// doClientSorting: Boolean
  		//		By default all the sorting is done serverside before the data is returned
  		//		which is the proper place to be doing it for really large datasets.
  		doClientSorting:false,
  	
  		// Items by identify for Identify API
  		_itemsByIdentity:null,
  		
  		// Identifier used
  		_identifier:null,
  	
  		_features: {'dojo.data.api.Read':true, 'dojo.data.api.Identity':true},
  	
  		_labelAttr: "label",
  		
  		constructor: function(/* Object */ params){
  			dojo.mixin(this,params);
  		},
  		
  		getValue: function(/* item */ item, /* attribute-name-string */ attribute, /* value? */ defaultValue){
  			//	According to the Read API comments in getValue() and exception is
  			//	thrown when an item is not an item or the attribute not a string!
  			this._assertIsItem(item);
  			if(!dojo.isString(attribute)){
  				throw new Error(this._className+".getValue(): Invalid attribute, string expected!");
  			}
  			if(!this.hasAttribute(item, attribute)){
  				// read api says: return defaultValue "only if *item* does not have a value for *attribute*."
  				// Is this the case here? The attribute doesn't exist, but a defaultValue, sounds reasonable.
  				if(defaultValue){
  					return defaultValue;
  				}
  			}
  			return item.i[attribute];
  		},
  		
  		getValues: function(/* item */ item, /* attribute-name-string */ attribute){
  			this._assertIsItem(item);
  			var ret = [];
  			if(this.hasAttribute(item, attribute)){
  				ret.push(item.i[attribute]);
  			}
  			return ret;
  		},
  		
  		getAttributes: function(/* item */ item){
  			this._assertIsItem(item);
  			var ret = [];
  			for(var i in item.i){
  				ret.push(i);
  			}
  			return ret;
  		},
  	
  		hasAttribute: function(/* item */ item,	/* attribute-name-string */ attribute){
  			// summary:
  			//		See dojo/data/api/Read.hasAttribute()
  			return this.isItem(item) && typeof item.i[attribute]!="undefined";
  		},
  		
  		containsValue: function(/* item */ item, /* attribute-name-string */ attribute, /* anything */ value){
  			var values = this.getValues(item, attribute);
  			var len = values.length;
  			for(var i=0; i<len; i++){
  				if(values[i] == value){
  					return true;
  				}
  			}
  			return false;
  		},
  		
  		isItem: function(/* anything */ something){
  			// Some basic tests, that are quick and easy to do here.
  			// >>> var store = new dojox.data.QueryReadStore({});
  			// >>> store.isItem("");
  			// false
  			//
  			// >>> var store = new dojox.data.QueryReadStore({});
  			// >>> store.isItem({});
  			// false
  			//
  			// >>> var store = new dojox.data.QueryReadStore({});
  			// >>> store.isItem(0);
  			// false
  			//
  			// >>> var store = new dojox.data.QueryReadStore({});
  			// >>> store.isItem({name:"me", label:"me too"});
  			// false
  
  			if(something){
  				return typeof something.r != "undefined" && something.r == this;
  			}
  			return false;
  		},
  		
  		isItemLoaded: function(/* anything */ something){
  			// Currently we dont have any state that tells if an item is loaded or not
  			// if the item exists its also loaded.
  			// This might change when we start working with refs inside items ...
  			return this.isItem(something);
  		},
  	
  		loadItem: function(/* object */ args){
  			if(this.isItemLoaded(args.item)){
  				return;
  			}
  			// Actually we have nothing to do here, or at least I dont know what to do here ...
  		},
  	
  		fetch:function(/* Object? */ request){
  			// summary:
  			//		See dojo.data.util.simpleFetch.fetch() this is just a copy and I adjusted
  			//		only the paging, since it happens on the server if doClientPaging is
  			//		false, thx to http://trac.dojotoolkit.org/ticket/4761 reporting this.
  			//		Would be nice to be able to use simpleFetch() to reduce copied code,
  			//		but i dont know how yet. Ideas please!
  			request = request || {};
  			if(!request.store){
  				request.store = this;
  			}
  			var self = this;
  		
  			var _errorHandler = function(errorData, requestObject){
  				if(requestObject.onError){
  					var scope = requestObject.scope || dojo.global;
  					requestObject.onError.call(scope, errorData, requestObject);
  				}
  			};
  		
  			var _fetchHandler = function(items, requestObject, numRows){
  				var oldAbortFunction = requestObject.abort || null;
  				var aborted = false;
  				
  				var startIndex = requestObject.start?requestObject.start:0;
  				if(self.doClientPaging == false){
  					// For client paging we dont need no slicing of the result.
  					startIndex = 0;
  				}
  				var endIndex = requestObject.count?(startIndex + requestObject.count):items.length;
  		
  				requestObject.abort = function(){
  					aborted = true;
  					if(oldAbortFunction){
  						oldAbortFunction.call(requestObject);
  					}
  				};
  		
  				var scope = requestObject.scope || dojo.global;
  				if(!requestObject.store){
  					requestObject.store = self;
  				}
  				if(requestObject.onBegin){
  					requestObject.onBegin.call(scope, numRows, requestObject);
  				}
  				if(requestObject.sort && self.doClientSorting){
  					items.sort(dojo.data.util.sorter.createSortFunction(requestObject.sort, self));
  				}
  				if(requestObject.onItem){
  					for(var i = startIndex; (i < items.length) && (i < endIndex); ++i){
  						var item = items[i];
  						if(!aborted){
  							requestObject.onItem.call(scope, item, requestObject);
  						}
  					}
  				}
  				if(requestObject.onComplete && !aborted){
  					var subset = null;
  					if(!requestObject.onItem){
  						subset = items.slice(startIndex, endIndex);
  					}
  					requestObject.onComplete.call(scope, subset, requestObject);
  				}
  			};
  			this._fetchItems(request, _fetchHandler, _errorHandler);
  			return request;	// Object
  		},
  	
  		getFeatures: function(){
  			return this._features;
  		},
  	
  		close: function(/*dojo/data/api/Request|Object?*/ request){
  			// I have no idea if this is really needed ...
  		},
  	
  		getLabel: function(/* item */ item){
  			// summary:
  			//		See dojo/data/api/Read.getLabel()
  			if(this._labelAttr && this.isItem(item)){
  				return this.getValue(item, this._labelAttr); //String
  			}
  			return undefined; //undefined
  		},
  	
  		getLabelAttributes: function(/* item */ item){
  			// summary:
  			//		See dojo/data/api/Read.getLabelAttributes()
  			if(this._labelAttr){
  				return [this._labelAttr]; //array
  			}
  			return null; //null
  		},
  		
  		_xhrFetchHandler: function(data, request, fetchHandler, errorHandler){
  			data = this._filterResponse(data);
  			if(data.label){
  				this._labelAttr = data.label;
  			}
  			var numRows = data.numRows || -1;
  
  			this._items = [];
  			// Store a ref to "this" in each item, so we can simply check if an item
  			// really origins form here (idea is from ItemFileReadStore, I just don't know
  			// how efficient the real storage use, garbage collection effort, etc. is).
  			dojo.forEach(data.items,function(e){
  				this._items.push({i:e, r:this});
  			},this);
  			
  			var identifier = data.identifier;
  			this._itemsByIdentity = {};
  			if(identifier){
  				this._identifier = identifier;
  				var i;
  				for(i = 0; i < this._items.length; ++i){
  					var item = this._items[i].i;
  					var identity = item[identifier];
  					if(!this._itemsByIdentity[identity]){
  						this._itemsByIdentity[identity] = item;
  					}else{
  						throw new Error(this._className+":  The json data as specified by: [" + this.url + "] is malformed.  Items within the list have identifier: [" + identifier + "].  Value collided: [" + identity + "]");
  					}
  				}
  			}else{
  				this._identifier = Number;
  				for(i = 0; i < this._items.length; ++i){
  					this._items[i].n = i;
  				}
  			}
  			
  			// TODO actually we should do the same as dojo.data.ItemFileReadStore._getItemsFromLoadedData() to sanitize
  			// (does it really sanititze them) and store the data optimal. should we? for security reasons???
  			numRows = this._numRows = (numRows === -1) ? this._items.length : numRows;
  			fetchHandler(this._items, request, numRows);
  			this._numRows = numRows;
  		},
  		
  		_fetchItems: function(request, fetchHandler, errorHandler){
  			// summary:
  			//		The request contains the data as defined in the Read-API.
  			//		Additionally there is following keyword "serverQuery".
  			//
  			//		####The *serverQuery* parameter, optional.
  			//
  			//		This parameter contains the data that will be sent to the server.
  			//		If this parameter is not given the parameter "query"'s
  			//		data are sent to the server. This is done for some reasons:
  			//
  			//		- to specify explicitly which data are sent to the server, they
  			//		  might also be a mix of what is contained in "query", "queryOptions"
  			//		  and the paging parameters "start" and "count" or may be even
  			//		  completely different things.
  			//		- don't modify the request.query data, so the interface using this
  			//		  store can rely on unmodified data, as the combobox dijit currently
  			//		  does it, it compares if the query has changed
  			//		- request.query is required by the Read-API
  			//
  			//		I.e. the following examples might be sent via GET:
  			//	|	  fetch({query:{name:"abc"}, queryOptions:{ignoreCase:true}})
  			//		  the URL will become:   /url.php?name=abc
  			//
  			//	|	  fetch({serverQuery:{q:"abc", c:true}, query:{name:"abc"}, queryOptions:{ignoreCase:true}})
  			//		  the URL will become:   /url.php?q=abc&c=true
  			//	|	  // The serverQuery-parameter has overruled the query-parameter
  			//	|	  // but the query parameter stays untouched, but is not sent to the server!
  			//	|	  // The serverQuery contains more data than the query, so they might differ!
  
  			var serverQuery = request.serverQuery || request.query || {};
  			//Need to add start and count
  			if(!this.doClientPaging){
  				serverQuery.start = request.start || 0;
  				// Count might not be sent if not given.
  				if(request.count){
  					serverQuery.count = request.count;
  				}
  			}
  			if(!this.doClientSorting && request.sort){
  				var sortInfo = [];
  				dojo.forEach(request.sort, function(sort){
  					if(sort && sort.attribute){
  						sortInfo.push((sort.descending ? "-" : "") + sort.attribute);
  					}
  				});
  				serverQuery.sort = sortInfo.join(',');
  			}
  			// Compare the last query and the current query by simply json-encoding them,
  			// so we dont have to do any deep object compare ... is there some dojo.areObjectsEqual()???
  			if(this.doClientPaging && this._lastServerQuery !== null &&
  				dojo.toJson(serverQuery) == dojo.toJson(this._lastServerQuery)
  				){
  				this._numRows = (this._numRows === -1) ? this._items.length : this._numRows;
  				fetchHandler(this._items, request, this._numRows);
  			}else{
  				var xhrFunc = this.requestMethod.toLowerCase() == "post" ? dojo.xhrPost : dojo.xhrGet;
  				var xhrHandler = xhrFunc({url:this.url, handleAs:"json-comment-optional", content:serverQuery, failOk: true});
  				request.abort = function(){
  					xhrHandler.cancel();
  				};
  				xhrHandler.addCallback(dojo.hitch(this, function(data){
  					this._xhrFetchHandler(data, request, fetchHandler, errorHandler);
  				}));
  				xhrHandler.addErrback(function(error){
  					errorHandler(error, request);
  				});
  				// Generate the hash using the time in milliseconds and a randon number.
  				// Since Math.randon() returns something like: 0.23453463, we just remove the "0."
  				// probably just for esthetic reasons :-).
  				this.lastRequestHash = new Date().getTime()+"-"+String(Math.random()).substring(2);
  				this._lastServerQuery = dojo.mixin({}, serverQuery);
  			}
  		},
  		
  		_filterResponse: function(data){
  			// summary:
  			//		If the data from servers needs to be processed before it can be processed by this
  			//		store, then this function should be re-implemented in subclass. This default
  			//		implementation just return the data unchanged.
  			// data:
  			//		The data received from server
  			return data;
  		},
  	
  		_assertIsItem: function(/* item */ item){
  			// summary:
  			//		It throws an error if item is not valid, so you can call it in every method that needs to
  			//		throw an error when item is invalid.
  			// item:
  			//		The item to test for being contained by the store.
  			if(!this.isItem(item)){
  				throw new Error(this._className+": Invalid item argument.");
  			}
  		},
  	
  		_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(this._className+": Invalid attribute argument ('"+attribute+"').");
  			}
  		},
  	
  		fetchItemByIdentity: function(/* Object */ keywordArgs){
  			// summary:
  			//		See dojo/data/api/Identity.fetchItemByIdentity()
  	
  			// See if we have already loaded the item with that id
  			// In case there hasn't been a fetch yet, _itemsByIdentity is null
  			// and thus a fetch will be triggered below.
  			if(this._itemsByIdentity){
  				var item = this._itemsByIdentity[keywordArgs.identity];
  				if(!(item === undefined)){
  					if(keywordArgs.onItem){
  						var scope = keywordArgs.scope ? keywordArgs.scope : dojo.global;
  						keywordArgs.onItem.call(scope, {i:item, r:this});
  					}
  					return;
  				}
  			}
  	
  			// Otherwise we need to go remote
  			// Set up error handler
  			var _errorHandler = function(errorData, requestObject){
  				var scope = keywordArgs.scope ? keywordArgs.scope : dojo.global;
  				if(keywordArgs.onError){
  					keywordArgs.onError.call(scope, errorData);
  				}
  			};
  			
  			// Set up fetch handler
  			var _fetchHandler = function(items, requestObject){
  				var scope = keywordArgs.scope ? keywordArgs.scope : dojo.global;
  				try{
  					// There is supposed to be only one result
  					var item = null;
  					if(items && items.length == 1){
  						item = items[0];
  					}
  					
  					// If no item was found, item is still null and we'll
  					// fire the onItem event with the null here
  					if(keywordArgs.onItem){
  						keywordArgs.onItem.call(scope, item);
  					}
  				}catch(error){
  					if(keywordArgs.onError){
  						keywordArgs.onError.call(scope, error);
  					}
  				}
  			};
  			
  			// Construct query
  			var request = {serverQuery:{id:keywordArgs.identity}};
  			
  			// Dispatch query
  			this._fetchItems(request, _fetchHandler, _errorHandler);
  		},
  		
  		getIdentity: function(/* item */ item){
  			// summary:
  			//		See dojo/data/api/Identity.getIdentity()
  			var identifier = null;
  			if(this._identifier === Number){
  				identifier = item.n; // Number
  			}else{
  				identifier = item.i[this._identifier];
  			}
  			return identifier;
  		},
  		
  		getIdentityAttributes: function(/* item */ item){
  			// summary:
  			//		See dojo/data/api/Identity.getIdentityAttributes()
  			return [this._identifier];
  		}
  	}
  );
  
  return dojox.data.QueryReadStore;
  });
  