PrefixUnaryExpression.class.php

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00001 <?php
00002 /****************************************************************************
00003  *   Copyright (C) 2004-2007 by Konstantin V. Arkhipov, Anton E. Lebedevich *
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 
00015     final class PrefixUnaryExpression implements LogicalObject, MappableObject
00016     {
00017         const NOT   = 'NOT';
00018         const MINUS = '-';
00019 
00020         private $subject    = null;
00021         private $logic      = null;
00022         
00023         public function __construct($logic, $subject)
00024         {
00025             $this->subject  = $subject;
00026             $this->logic    = $logic;
00027         }
00028         
00029         public function toDialectString(Dialect $dialect)
00030         {
00031             return
00032                 '('
00033                 .$this->logic
00034                 .' '.$dialect->toFieldString($this->subject)
00035                 .')';
00036         }
00037         
00041         public function toMapped(ProtoDAO $dao, JoinCapableQuery $query)
00042         {
00043             return new self(
00044                 $this->logic,
00045                 $dao->guessAtom($this->subject, $query)
00046             );
00047         }
00048         
00049         public function toBoolean(Form $form)
00050         {
00051             $subject = $form->toFormValue($this->subject);
00052                 
00053             switch ($this->logic) {
00054                 case self::NOT :
00055                     return false === $subject;
00056 
00057                 default:
00058                     
00059                     throw new UnsupportedMethodException(
00060                         "'{$this->logic}' doesn't supported yet"
00061                     );
00062             }
00063         }
00064     }
00065 ?>