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+if(!dojo._hasResource["dojox.data.QueryReadStore"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource["dojox.data.QueryReadStore"] = true;
+dojo.provide("dojox.data.QueryReadStore");
+
+dojo.require("dojo.string");
+
+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
+ // retreiving 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 retreive 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.
+ //
+ // examples:
+ // | // 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
+ // securly. 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 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,
+
+ // summary:
+ // By default every request for paging is sent to the server.
+ doClientPaging:false,
+
+ // summary:
+ // 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;
+ }
+ console.log(this._className+".getValue(): Item does not have the attribute '"+attribute+"'.");
+ }
+ 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 && this.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 || keywordArgs || null */ 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
+ },
+
+ _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){
+ if(request.sort){
+ var sort = request.sort[0];
+ if(sort && sort.attribute){
+ var sortStr = sort.attribute;
+ if(sort.descending){
+ sortStr = "-" + sortStr;
+ }
+ serverQuery.sort = sortStr;
+ }
+ }
+ }
+ // 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)
+ ){
+ fetchHandler(this._items, request);
+ }else{
+ var xhrFunc = this.requestMethod.toLowerCase()=="post" ? dojo.xhrPost : dojo.xhrGet;
+ var xhrHandler = xhrFunc({url:this.url, handleAs:"json-comment-optional", content:serverQuery});
+ xhrHandler.addCallback(dojo.hitch(this, function(data){
+ 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;
+ 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 = (numRows === -1) ? this._items.length : numRows;
+ fetchHandler(this._items, request, numRows);
+ }));
+ 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, error);
+ }
+ };
+
+ // 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];
+ }
+ }
+);
+
+}
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