library/Zend/Pdf/Element/Null.php

   1 <?php
   2 /**
   3  * Zend Framework
   4  *
   5  * LICENSE
   6  *
   7  * This source file is subject to the new BSD license that is bundled
   8  * with this package in the file LICENSE.txt.
   9  * It is also available through the world-wide-web at this URL:
  10  * http://framework.zend.com/license/new-bsd
  11  * If you did not receive a copy of the license and are unable to
  12  * obtain it through the world-wide-web, please send an email
  13  * to license@zend.com so we can send you a copy immediately.
  14  *
  15  * @category   Zend
  16  * @package    Zend_Pdf
  17  * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
  18  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  19  * @version    $Id: Null.php 16541 2009-07-07 06:59:03Z bkarwin $
  20  */
  21
  22
  23 /** Zend_Pdf_Element */
  24 require_once 'Zend/Pdf/Element.php';
  25
  26
  27 /**
  28  * PDF file 'null' element implementation
  29  *
  30  * @category   Zend
  31  * @package    Zend_Pdf
  32  * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
  33  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  34  */
  35 class Zend_Pdf_Element_Null extends Zend_Pdf_Element
  36 {
  37     /**
  38      * Object value. Always null.
  39      *
  40      * @var mixed
  41      */
  42     public $value;
  43
  44
  45     /**
  46      * Object constructor
  47      */
  48     public function __construct()
  49     {
  50         $this->value = null;
  51     }
  52
  53
  54     /**
  55      * Return type of the element.
  56      *
  57      * @return integer
  58      */
  59     public function getType()
  60     {
  61         return Zend_Pdf_Element::TYPE_NULL;
  62     }
  63
  64
  65     /**
  66      * Return object as string
  67      *
  68      * @param Zend_Pdf_Factory $factory
  69      * @return string
  70      */
  71     public function toString($factory = null)
  72     {
  73         return 'null';
  74     }
  75 }