ExtractPart.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2007 by Konstantin V. Arkhipov                          *
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 /* $Id: ExtractPart.class.php 4687 2007-12-09 18:57:18Z voxus $ */
00012 
00016     final class ExtractPart implements DialectString, MappableObject
00017     {
00018         private $what = null;
00019         private $from = null;
00020         
00021         public static function create(
00022             /* DatePart */ $what,
00023             /* DialectString */ $from
00024         )
00025         {
00026             return new self($what, $from);
00027         }
00028         
00029         public function __construct(
00030             /* DatePart */ $what,
00031             /* DialectString */ $from
00032         )
00033         {
00034             if ($from instanceof DialectString)
00035                 Assert::isTrue(
00036                     ($from instanceof DBValue)
00037                     || ($from instanceof DBField)
00038                 );
00039             else
00040                 $from = new DBField($from);
00041             
00042             if (!$what instanceof DatePart)
00043                 $what = new DatePart($what);
00044             
00045             $this->what = $what;
00046             $this->from = $from;
00047         }
00048         
00052         public function toMapped(StorableDAO $dao, JoinCapableQuery $query)
00053         {
00054             return self::create(
00055                 $this->what,
00056                 $dao->guessAtom($this->from, $query)
00057             );
00058         }
00059         
00060         public function toDialectString(Dialect $dialect)
00061         {
00062             return
00063                 'EXTRACT('
00064                 .$this->what->toString()
00065                 .' FROM '
00066                 .$this->from->toDialectString($dialect)
00067                 .')';
00068         }
00069     }
00070 ?>

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