DateObjectComparator.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 DateObjectComparator extends Singleton
00013         implements Comparator, Instantiatable
00014     {
00015         public static function me()
00016         {
00017             return Singleton::getInstance(__CLASS__);
00018         }
00019 
00020         public function compare(/*Date*/ $one,/*Date*/ $two)
00021         {
00022             Assert::isInstance($one, 'Date');
00023             Assert::isInstance($two, 'Date');
00024 
00025             $stamp1 = $one->toStamp();
00026             $stamp2 = $two->toStamp();
00027 
00028             if ($stamp1 == $stamp2)
00029                 return 0;
00030 
00031             return ($stamp1 < $stamp2) ? -1 : 1;
00032         }
00033     }
00034 ?>