ImmutableObjectComparator.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2009 by Denis M. Gabaidulin                             *
00004  *                                                                         *
00005  *   This program is free software; you can redistribute it and/or modify  *
00006  *   it under the terms of the GNU Lesser General Public License as        *
00007  *   published by the Free Software Foundation; either version 3 of the    *
00008  *   License, or (at your option) any later version.                       *
00009  *                                                                         *
00010  ***************************************************************************/
00011 
00012     final class ImmutableObjectComparator extends Singleton
00013         implements Comparator, Instantiatable
00014     {
00015         public static function me()
00016         {
00017             return Singleton::getInstance(__CLASS__);
00018         }
00019 
00020         public function compare($one, $two)
00021         {
00022             Assert::isInstance($one, 'Identifiable');
00023             Assert::isInstance($two, 'Identifiable');
00024 
00025             $oneId = $one->getId();
00026             $twoId = $two->getId();
00027 
00028             if ($oneId === $twoId)
00029                 return 0;
00030 
00031             return ($oneId < $twoId) ? -1 : 1;
00032         }
00033     }
00034 ?>