1 /**
  2  * @license
  3  * ==========================================================================
  4  * SproutCore Costello -- Property Observing Library
  5  * Copyright ©2006-2011, Strobe Inc. and contributors.
  6  * Portions copyright ©2008-2011 Apple Inc. All rights reserved.
  7  * 
  8  * Permission is hereby granted, free of charge, to any person obtaining a 
  9  * copy of this software and associated documentation files (the "Software"), 
 10  * to deal in the Software without restriction, including without limitation 
 11  * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 12  * and/or sell copies of the Software, and to permit persons to whom the 
 13  * Software is furnished to do so, subject to the following conditions:
 14  * 
 15  * The above copyright notice and this permission notice shall be included in 
 16  * all copies or substantial portions of the Software.
 17  * 
 18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 24  * DEALINGS IN THE SOFTWARE.
 25  * 
 26  * For more information about SproutCore, visit http://www.sproutcore.com
 27  * 
 28  * ==========================================================================
 29  */
 30