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// Copyright 2011 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Wrappers for the HTML5 IndexedDB. The wrappers export nearly
* the same interface as the standard API, but return goog.async.Deferred
* objects instead of request objects and use Closure events. The wrapper works
* and has been tested on Chrome version 18+. Though they should work in theory,
* the wrapper tests fail in strange, non-deterministic ways on Firefox 6,
* unfortunately.
*
* Example usage:
*
* <code>
* goog.db.openDatabase('mydb').addCallback(function(db) {
* return db.setVersion('1.0').addCallback(function(tx) {
* db.createObjectStore('mystore');
* // restart to see our structure changes
* return goog.db.openDatabase('mydb');
* });
* }).addCallback(function(db) {
* var putTx = db.createTransaction(
* [],
* goog.db.Transaction.TransactionMode.READ_WRITE);
* var store = putTx.objectStore('mystore');
* store.put('value', 'key');
* goog.listen(putTx, goog.db.Transaction.EventTypes.COMPLETE, function() {
* var getTx = db.createTransaction([]);
* var request = getTx.objectStore('mystore').get('key');
* request.addCallback(function(result) {
* ...
* });
* });
* </code>
*
*/
goog.provide('goog.db');
goog.require('goog.async.Deferred');
goog.require('goog.db.Error');
goog.require('goog.db.IndexedDb');
/**
* Opens a database connection and wraps it.
*
* @param {string} name The name of the database to open.
* @return {!goog.async.Deferred} The deferred database object.
*/
goog.db.openDatabase = function(name) {
var indexedDb = goog.global.indexedDB || goog.global.mozIndexedDB ||
goog.global.webkitIndexedDB || goog.global.moz_indexedDB;
var d = new goog.async.Deferred();
var openRequest = indexedDb.open(name);
openRequest.onsuccess = function(ev) {
var db = new goog.db.IndexedDb(ev.target.result);
d.callback(db);
};
openRequest.onerror = function(ev) {
var msg = 'opening database ' + name;
d.errback(new goog.db.Error(ev.target.code, msg));
};
return d;
};
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