1 /**
  2 * UID by Grant Skinner. Dec 5, 2010
  3 * Visit www.gskinner.com/blog for documentation, updates and more free code.
  4 *
  5 *
  6 * Copyright (c) 2010 Grant Skinner
  7 * 
  8 * Permission is hereby granted, free of charge, to any person
  9 * obtaining a copy of this software and associated documentation
 10 * files (the "Software"), to deal in the Software without
 11 * restriction, including without limitation the rights to use,
 12 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 13 * copies of the Software, and to permit persons to whom the
 14 * Software is furnished to do so, subject to the following
 15 * conditions:
 16 * 
 17 * The above copyright notice and this permission notice shall be
 18 * included in all copies or substantial portions of the Software.
 19 * 
 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 22 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 24 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 25 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 27 * OTHER DEALINGS IN THE SOFTWARE.
 28 **/
 29 
 30 
 31 	
 32 // constructor:
 33 	/**
 34 	* The UID class uses a static interface (ex. UID.get()) and should not be instantiated.
 35 	* @class Global utility for generating sequential unique ID numbers.
 36 	**/
 37 	function UID() {
 38 		throw "UID cannot be instantiated"; 
 39 	}
 40 	
 41 // private static properties:
 42 	/** @private **/
 43 	UID._nextID = 0;
 44 	
 45 	/**
 46 	* Returns the next unique id.
 47 	* @static
 48 	**/
 49 	UID.get = function() {
 50 		return UID._nextID++;
 51 	}
 52