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488 lines
14 KiB
JavaScript
488 lines
14 KiB
JavaScript
/*
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Copyright (c) 2004-2011, 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.ObjectStore"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.data.ObjectStore"] = true;
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dojo.provide("dojo.data.ObjectStore");
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dojo.require("dojo.regexp");
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dojo.declare("dojo.data.ObjectStore", null,{
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objectStore: null,
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constructor: function(options){
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// summary:
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// A Dojo Data implementation that wraps Dojo object stores for backwards
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// compatibility.
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// options:
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// The configuration information to pass into the data store.
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// options.objectStore:
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// The object store to use as the source provider for this data store
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dojo.mixin(this, options);
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},
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labelProperty: "label",
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getValue: function(/*Object*/ item, /*String*/property, /*value?*/defaultValue){
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// summary:
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// Gets the value of an item's 'property'
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//
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// item:
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// The item to get the value from
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// property:
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// property to look up value for
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// defaultValue:
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// the default value
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return typeof item.get === "function" ? item.get(property) :
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property in item ?
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item[property] : defaultValue;
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},
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getValues: function(item, property){
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// summary:
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// Gets the value of an item's 'property' and returns
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// it. If this value is an array it is just returned,
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// if not, the value is added to an array and that is returned.
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//
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// item: /* object */
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// property: /* string */
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// property to look up value for
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var val = this.getValue(item,property);
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return val instanceof Array ? val : val === undefined ? [] : [val];
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},
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getAttributes: function(item){
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// summary:
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// Gets the available attributes of an item's 'property' and returns
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// it as an array.
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//
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// item: /* object */
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var res = [];
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for(var i in item){
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if(item.hasOwnProperty(i) && !(i.charAt(0) == '_' && i.charAt(1) == '_')){
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res.push(i);
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}
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}
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return res;
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},
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hasAttribute: function(item,attribute){
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// summary:
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// Checks to see if item has attribute
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//
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// item: /* object */
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// attribute: /* string */
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return attribute in item;
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},
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containsValue: function(item, attribute, value){
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// summary:
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// Checks to see if 'item' has 'value' at 'attribute'
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//
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// item: /* object */
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// attribute: /* string */
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// value: /* anything */
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return dojo.indexOf(this.getValues(item,attribute),value) > -1;
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},
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isItem: function(item){
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// summary:
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// Checks to see if the argument is an item
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//
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// item: /* object */
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// attribute: /* string */
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// we have no way of determining if it belongs, we just have object returned from
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// service queries
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return (typeof item == 'object') && item && !(item instanceof Date);
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},
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isItemLoaded: function(item){
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// summary:
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// Checks to see if the item is loaded.
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//
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// item: /* object */
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return item && typeof item.load !== "function";
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},
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loadItem: function(args){
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// summary:
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// Loads an item and calls the callback handler. Note, that this will call the callback
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// handler even if the item is loaded. Consequently, you can use loadItem to ensure
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// that an item is loaded is situations when the item may or may not be loaded yet.
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// If you access a value directly through property access, you can use this to load
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// a lazy value as well (doesn't need to be an item).
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//
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// example:
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// store.loadItem({
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// item: item, // this item may or may not be loaded
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// onItem: function(item){
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// // do something with the item
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// }
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// });
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var item;
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if(typeof args.item.load === "function"){
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dojo.when(args.item.load(), function(result){
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item = result; // in synchronous mode this can allow loadItem to return the value
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var func = result instanceof Error ? args.onError : args.onItem;
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if(func){
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func.call(args.scope, result);
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}
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});
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}else if(args.onItem){
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// even if it is already loaded, we will use call the callback, this makes it easier to
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// use when it is not known if the item is loaded (you can always safely call loadItem).
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args.onItem.call(args.scope, args.item);
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}
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return item;
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},
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close: function(request){
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return request && request.abort && request.abort();
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},
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fetch: function(args){
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// summary:
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// See dojo.data.api.Read.fetch
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//
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args = args || {};
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var self = this;
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var scope = args.scope || self;
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var query = args.query;
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if(typeof query == "object"){ // can be null, but that is ignore by for-in
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query = dojo.delegate(query); // don't modify the original
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for(var i in query){
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// find any strings and convert them to regular expressions for wildcard support
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var required = query[i];
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if(typeof required == "string"){
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query[i] = RegExp("^" + dojo.regexp.escapeString(required, "*?").replace(/\*/g, '.*').replace(/\?/g, '.') + "$", args.queryOptions && args.queryOptions.ignoreCase ? "mi" : "m");
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query[i].toString = (function(original){
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return function(){
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return original;
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}
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})(required);
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}
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}
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}
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var results = this.objectStore.query(query, args);
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dojo.when(results.total, function(totalCount){
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dojo.when(results, function(results){
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if(args.onBegin){
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args.onBegin.call(scope, totalCount || results.length, args);
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}
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if(args.onItem){
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for(var i=0; i<results.length;i++){
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args.onItem.call(scope, results[i], args);
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}
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}
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if(args.onComplete){
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args.onComplete.call(scope, args.onItem ? null : results, args);
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}
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return results;
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}, errorHandler);
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}, errorHandler);
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function errorHandler(error){
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if(args.onError){
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args.onError.call(scope, error, args);
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}
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}
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args.abort = function(){
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// abort the request
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if(results.cancel){
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results.cancel();
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}
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};
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args.store = this;
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return args;
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},
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getFeatures: function(){
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// summary:
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// return the store feature set
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return {
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"dojo.data.api.Read": !!this.objectStore.get,
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"dojo.data.api.Identity": true,
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"dojo.data.api.Write": !!this.objectStore.put,
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"dojo.data.api.Notification": true
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};
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},
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getLabel: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getLabel()
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if(this.isItem(item)){
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return this.getValue(item,this.labelProperty); //String
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}
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return undefined; //undefined
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},
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getLabelAttributes: function(/* item */ item){
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// summary:
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// See dojo.data.api.Read.getLabelAttributes()
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return [this.labelProperty]; //array
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},
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//Identity API Support
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getIdentity: function(item){
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return item.getId ? item.getId() : item[this.objectStore.idProperty || "id"];
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},
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getIdentityAttributes: function(item){
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// summary:
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// returns the attributes which are used to make up the
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// identity of an item. Basically returns this.objectStore.idProperty
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return [this.objectStore.idProperty];
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},
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fetchItemByIdentity: function(args){
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// summary:
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// fetch an item by its identity, by looking in our index of what we have loaded
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var item;
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dojo.when(this.objectStore.get(args.identity),
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function(result){
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item = result;
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args.onItem.call(args.scope, result);
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},
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function(error){
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args.onError.call(args.scope, error);
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}
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);
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return item;
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},
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newItem: function(data, parentInfo){
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// summary:
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// adds a new item to the store at the specified point.
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// Takes two parameters, data, and options.
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//
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// data: /* object */
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// The data to be added in as an item.
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if(parentInfo){
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// get the previous value or any empty array
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var values = this.getValue(parentInfo.parent,parentInfo.attribute,[]);
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// set the new value
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values = values.concat([data]);
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data.__parent = values;
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this.setValue(parentInfo.parent, parentInfo.attribute, values);
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}
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this._dirtyObjects.push({object:data, save: true});
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this.onNew(data);
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return data;
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},
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deleteItem: function(item){
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// summary:
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// deletes item and any references to that item from the store.
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//
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// item:
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// item to delete
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//
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// If the desire is to delete only one reference, unsetAttribute or
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// setValue is the way to go.
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this.changing(item, true);
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this.onDelete(item);
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},
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setValue: function(item, attribute, value){
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// summary:
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// sets 'attribute' on 'item' to 'value'
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var old = item[attribute];
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this.changing(item);
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item[attribute]=value;
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this.onSet(item,attribute,old,value);
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},
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setValues: function(item, attribute, values){
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// summary:
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// sets 'attribute' on 'item' to 'value' value
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// must be an array.
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if(!dojo.isArray(values)){
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throw new Error("setValues expects to be passed an Array object as its value");
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}
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this.setValue(item,attribute,values);
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},
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unsetAttribute: function(item, attribute){
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// summary:
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// unsets 'attribute' on 'item'
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this.changing(item);
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var old = item[attribute];
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delete item[attribute];
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this.onSet(item,attribute,old,undefined);
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},
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_dirtyObjects: [],
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changing: function(object,_deleting){
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// summary:
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// adds an object to the list of dirty objects. This object
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// contains a reference to the object itself as well as a
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// cloned and trimmed version of old object for use with
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// revert.
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object.__isDirty = true;
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//if an object is already in the list of dirty objects, don't add it again
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//or it will overwrite the premodification data set.
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for(var i=0; i<this._dirtyObjects.length; i++){
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var dirty = this._dirtyObjects[i];
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if(object==dirty.object){
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if(_deleting){
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// we are deleting, no object is an indicator of deletiong
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dirty.object = false;
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if(!this._saveNotNeeded){
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dirty.save = true;
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}
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}
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return;
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}
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}
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var old = object instanceof Array ? [] : {};
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for(i in object){
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if(object.hasOwnProperty(i)){
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old[i] = object[i];
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}
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}
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this._dirtyObjects.push({object: !_deleting && object, old: old, save: !this._saveNotNeeded});
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},
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save: function(kwArgs){
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// summary:
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// Saves the dirty data using object store provider. See dojo.data.api.Write for API.
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//
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// kwArgs.global:
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// This will cause the save to commit the dirty data for all
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// ObjectStores as a single transaction.
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//
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// kwArgs.revertOnError
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// This will cause the changes to be reverted if there is an
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// error on the save. By default a revert is executed unless
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// a value of false is provide for this parameter.
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kwArgs = kwArgs || {};
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var result, actions = [];
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var alreadyRecorded = {};
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var savingObjects = [];
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var self;
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var dirtyObjects = this._dirtyObjects;
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var left = dirtyObjects.length;// this is how many changes are remaining to be received from the server
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try{
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dojo.connect(kwArgs,"onError",function(){
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if(kwArgs.revertOnError !== false){
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var postCommitDirtyObjects = dirtyObjects;
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dirtyObjects = savingObjects;
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var numDirty = 0; // make sure this does't do anything if it is called again
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jr.revert(); // revert if there was an error
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self._dirtyObjects = postCommitDirtyObjects;
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}
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else{
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self._dirtyObjects = dirtyObject.concat(savingObjects);
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}
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});
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if(this.objectStore.transaction){
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var transaction = this.objectStore.transaction();
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}
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for(var i = 0; i < dirtyObjects.length; i++){
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var dirty = dirtyObjects[i];
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var object = dirty.object;
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var old = dirty.old;
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delete object.__isDirty;
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if(object){
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result = this.objectStore.put(object, {overwrite: !!old});
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}
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else{
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result = this.objectStore.remove(this.getIdentity(old));
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}
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savingObjects.push(dirty);
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dirtyObjects.splice(i--,1);
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dojo.when(result, function(value){
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if(!(--left)){
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if(kwArgs.onComplete){
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kwArgs.onComplete.call(kwArgs.scope, actions);
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}
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}
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},function(value){
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// on an error we want to revert, first we want to separate any changes that were made since the commit
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left = -1; // first make sure that success isn't called
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kwArgs.onError.call(kwArgs.scope, value);
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});
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}
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if(transaction){
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transaction.commit();
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}
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}catch(e){
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kwArgs.onError.call(kwArgs.scope, value);
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}
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},
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revert: function(kwArgs){
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// summary
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// returns any modified data to its original state prior to a save();
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//
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var dirtyObjects = this._dirtyObjects;
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for(var i = dirtyObjects.length; i > 0;){
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i--;
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var dirty = dirtyObjects[i];
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var object = dirty.object;
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var old = dirty.old;
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if(object && old){
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// changed
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for(var j in old){
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if(old.hasOwnProperty(j) && object[j] !== old[j]){
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this.onSet(object, j, object[j], old[j]);
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object[j] = old[j];
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}
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}
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for(j in object){
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if(!old.hasOwnProperty(j)){
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this.onSet(object, j, object[j]);
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delete object[j];
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}
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}
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}else if(!old){
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// was an addition, remove it
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this.onDelete(object);
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}else{
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// was a deletion, we will add it back
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this.onNew(old);
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}
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delete (object || old).__isDirty;
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dirtyObjects.splice(i, 1);
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}
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},
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isDirty: function(item){
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// summary
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// returns true if the item is marked as dirty or true if there are any dirty items
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if(!item){
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return !!this._dirtyObjects.length;
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}
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return item.__isDirty;
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},
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//Notifcation Support
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onSet: function(){},
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onNew: function(){},
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onDelete: function(){}
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}
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);
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}
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