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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 Provides data persistence using HTML5 session storage
* mechanism. Session storage must be available under window.sessionStorage,
* see: http://www.w3.org/TR/webstorage/#the-sessionstorage-attribute.
*
*/
goog.provide('goog.storage.mechanism.HTML5SessionStorage');
goog.require('goog.storage.mechanism.HTML5WebStorage');
/**
* Provides a storage mechanism that uses HTML5 session storage.
*
* @constructor
* @extends {goog.storage.mechanism.HTML5WebStorage}
*/
goog.storage.mechanism.HTML5SessionStorage = function() {
var storage = null;
/** @preserveTry */
try {
// May throw an exception in cases where the session storage object is
// visible but access to it is disabled. For example, accessing the file
// in local mode in Firefox throws 'Operation is not supported' exception.
storage = window.sessionStorage || null;
} catch (e) {}
goog.base(this, storage);
};
goog.inherits(goog.storage.mechanism.HTML5SessionStorage,
goog.storage.mechanism.HTML5WebStorage);
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