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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Filter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Filter_Interface
  */
 // require_once 'Zend/Filter/Interface.php';
 
 /**
  * @category   Zend
  * @package    Zend_Filter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Filter_Null implements Zend_Filter_Interface
 {
     const BOOLEAN      = 1;
     const INTEGER      = 2;
     const EMPTY_ARRAY  = 4;
     const STRING       = 8;
     const ZERO         = 16;
     const ALL          = 31;
 
     protected $_constants = array(
         self::BOOLEAN     => 'boolean',
         self::INTEGER     => 'integer',
         self::EMPTY_ARRAY => 'array',
         self::STRING      => 'string',
         self::ZERO        => 'zero',
         self::ALL         => 'all'
     );
 
     /**
      * Internal type to detect
      *
      * @var integer
      */
     protected $_type = self::ALL;
 
     /**
      * Constructor
      *
      * @param string|array|Zend_Config $options OPTIONAL
      */
     public function __construct($options = null)
     {
         if ($options instanceof Zend_Config) {
             $options = $options->toArray();
         } else if (!is_array($options)) {
             $options = func_get_args();
             $temp    = array();
             if (!empty($options)) {
                 $temp = array_shift($options);
             }
             $options = $temp;
         } else if (is_array($options) && array_key_exists('type', $options)) {
             $options = $options['type'];
         }
 
         if (!empty($options)) {
             $this->setType($options);
         }
     }
 
     /**
      * Returns the set null types
      *
      * @return array
      */
     public function getType()
     {
         return $this->_type;
     }
 
     /**
      * Set the null types
      *
      * @param  integer|array $type
      * @throws Zend_Filter_Exception
      * @return Zend_Filter_Null
      */
     public function setType($type = null)
     {
         if (is_array($type)) {
             $detected = 0;
             foreach($type as $value) {
                 if (is_int($value)) {
                     $detected += $value;
                 } else if (in_array($value, $this->_constants)) {
                     $detected += array_search($value, $this->_constants);
                 }
             }
 
             $type = $detected;
         } else if (is_string($type)) {
             if (in_array($type, $this->_constants)) {
                 $type = array_search($type, $this->_constants);
             }
         }
 
         if (!is_int($type) || ($type < 0) || ($type > self::ALL)) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception('Unknown type');
         }
 
         $this->_type = $type;
         return $this;
     }
 
     /**
      * Defined by Zend_Filter_Interface
      *
      * Returns null representation of $value, if value is empty and matches
      * types that should be considered null.
      *
      * @param  string $value
      * @return string
      */
     public function filter($value)
     {
         $type = $this->getType();
 
         // STRING ZERO ('0')
         if ($type >= self::ZERO) {
             $type -= self::ZERO;
             if (is_string($value) && ($value == '0')) {
                 return null;
             }
         }
 
         // STRING ('')
         if ($type >= self::STRING) {
             $type -= self::STRING;
             if (is_string($value) && ($value == '')) {
                 return null;
             }
         }
 
         // EMPTY_ARRAY (array())
         if ($type >= self::EMPTY_ARRAY) {
             $type -= self::EMPTY_ARRAY;
             if (is_array($value) && ($value == array())) {
                 return null;
             }
         }
 
         // INTEGER (0)
         if ($type >= self::INTEGER) {
             $type -= self::INTEGER;
             if (is_int($value) && ($value == 0)) {
                 return null;
             }
         }
 
         // BOOLEAN (false)
         if ($type >= self::BOOLEAN) {
             $type -= self::BOOLEAN;
             if (is_bool($value) && ($value == false)) {
                 return null;
             }
         }
 
         return $value;
     }
 }