98 lines
4.0 KiB
JavaScript
98 lines
4.0 KiB
JavaScript
/*
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Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojo.data.util.simpleFetch"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.data.util.simpleFetch"] = true;
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dojo.provide("dojo.data.util.simpleFetch");
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dojo.require("dojo.data.util.sorter");
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dojo.data.util.simpleFetch.fetch = function(/* Object? */ request){
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// summary:
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// The simpleFetch mixin is designed to serve as a set of function(s) that can
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// be mixed into other datastore implementations to accelerate their development.
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// The simpleFetch mixin should work well for any datastore that can respond to a _fetchItems()
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// call by returning an array of all the found items that matched the query. The simpleFetch mixin
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// is not designed to work for datastores that respond to a fetch() call by incrementally
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// loading items, or sequentially loading partial batches of the result
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// set. For datastores that mixin simpleFetch, simpleFetch
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// implements a fetch method that automatically handles eight of the fetch()
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// arguments -- onBegin, onItem, onComplete, onError, start, count, sort and scope
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// The class mixing in simpleFetch should not implement fetch(),
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// but should instead implement a _fetchItems() method. The _fetchItems()
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// method takes three arguments, the keywordArgs object that was passed
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// to fetch(), a callback function to be called when the result array is
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// available, and an error callback to be called if something goes wrong.
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// The _fetchItems() method should ignore any keywordArgs parameters for
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// start, count, onBegin, onItem, onComplete, onError, sort, and scope.
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// The _fetchItems() method needs to correctly handle any other keywordArgs
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// parameters, including the query parameter and any optional parameters
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// (such as includeChildren). The _fetchItems() method should create an array of
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// result items and pass it to the fetchHandler along with the original request object
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// -- or, the _fetchItems() method may, if it wants to, create an new request object
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// with other specifics about the request that are specific to the datastore and pass
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// that as the request object to the handler.
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//
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// For more information on this specific function, see dojo.data.api.Read.fetch()
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request = request || {};
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if(!request.store){
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request.store = this;
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}
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var self = this;
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var _errorHandler = function(errorData, requestObject){
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if(requestObject.onError){
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var scope = requestObject.scope || dojo.global;
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requestObject.onError.call(scope, errorData, requestObject);
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}
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};
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var _fetchHandler = function(items, requestObject){
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var oldAbortFunction = requestObject.abort || null;
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var aborted = false;
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var startIndex = requestObject.start?requestObject.start:0;
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var endIndex = (requestObject.count && (requestObject.count !== Infinity))?(startIndex + requestObject.count):items.length;
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requestObject.abort = function(){
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aborted = true;
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if(oldAbortFunction){
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oldAbortFunction.call(requestObject);
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}
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};
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var scope = requestObject.scope || dojo.global;
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if(!requestObject.store){
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requestObject.store = self;
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}
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if(requestObject.onBegin){
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requestObject.onBegin.call(scope, items.length, requestObject);
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}
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if(requestObject.sort){
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items.sort(dojo.data.util.sorter.createSortFunction(requestObject.sort, self));
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}
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if(requestObject.onItem){
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for(var i = startIndex; (i < items.length) && (i < endIndex); ++i){
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var item = items[i];
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if(!aborted){
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requestObject.onItem.call(scope, item, requestObject);
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}
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}
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}
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if(requestObject.onComplete && !aborted){
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var subset = null;
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if(!requestObject.onItem){
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subset = items.slice(startIndex, endIndex);
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}
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requestObject.onComplete.call(scope, subset, requestObject);
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}
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};
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this._fetchItems(request, _fetchHandler, _errorHandler);
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return request; // Object
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};
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}
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