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/*
Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
Available via Academic Free License >= 2.1 OR the modified BSD license.
see: http://dojotoolkit.org/license for details
*/
if(!dojo._hasResource["dojo.store.DataStore"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo.store.DataStore"] = true;
dojo.provide("dojo.store.DataStore");
dojo.require("dojo.store.util.QueryResults");
dojo.declare("dojo.store.DataStore", null, {
target: "",
constructor: function(options){
// summary:
// This is an adapter for using Dojo Data stores with an object store consumer.
// You can provide a Dojo data store and use this adapter to interact with it through
// the Dojo object store API
// options: Object?
// This provides any configuration information that will be mixed into the store,
// including a reference to the Dojo data store under the property "store".
dojo.mixin(this, options);
},
_objectConverter: function(callback){
var store = this.store;
return function(item){
var object = {};
var attributes = store.getAttributes(item);
for(var i = 0; i < attributes.length; i++){
object[attributes[i]] = store.getValue(item, attributes[i]);
}
return callback(object);
};
},
get: function(id, options){
// summary:
// Retrieves an object by it's identity. This will trigger a fetchItemByIdentity
// id: Object?
// The identity to use to lookup the object
var returnedObject, returnedError;
var deferred = new dojo.Deferred();
this.store.fetchItemByIdentity({
identity: id,
onItem: this._objectConverter(function(object){
deferred.resolve(returnedObject = object);
}),
onError: function(error){
deferred.reject(returnedError = error);
}
});
if(returnedObject){
// if it was returned synchronously
return returnedObject;
}
if(returnedError){
throw returnedError;
}
return deferred.promise;
},
put: function(object, options){
// summary:
// Stores an object by its identity.
// object: Object
// The object to store.
// options: Object?
// Additional metadata for storing the data. Includes a reference to an id
// that the object may be stored with (i.e. { id: "foo" }).
var id = options && typeof options.id != "undefined" || this.getIdentity(object);
var store = this.store;
if(typeof id == "undefined"){
store.newItem(object);
}else{
store.fetchItemByIdentity({
identity: id,
onItem: function(item){
if(item){
for(var i in object){
if(store.getValue(item, i) != object[i]){
store.setValue(item, i, object[i]);
}
}
}else{
store.newItem(object);
}
}
});
}
},
remove: function(id){
// summary:
// Deletes an object by its identity.
// id: Object
// The identity to use to delete the object
var store = this.store;
this.store.fetchItemByIdentity({
identity: id,
onItem: function(item){
store.deleteItem(item);
}
});
},
query: function(query, options){
// summary:
// Queries the store for objects.
// query: Object
// The query to use for retrieving objects from the store
// options: Object?
// Optional options object as used by the underlying dojo.data Store.
// returns: dojo.store.util.QueryResults
// A query results object that can be used to iterate over results.
var returnedObject, returnedError;
var deferred = new dojo.Deferred();
deferred.total = new dojo.Deferred();
var converter = this._objectConverter(function(object){return object;});
this.store.fetch(dojo.mixin({
query: query,
onBegin: function(count){
deferred.total.resolve(count);
},
onComplete: function(results){
deferred.resolve(dojo.map(results, converter));
},
onError: function(error){
deferred.reject(error);
}
}, options));
return dojo.store.util.QueryResults(deferred);
},
getIdentity: function(object){
// summary:
// Fetch the identity for the given object.
// object: Object
// The data object to get the identity from.
// returns: Number
// The id of the given object.
return object[this.idProperty || this.store.getIdentityAttributes()[0]];
}
});
}
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