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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_Ldap
  * @subpackage 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_Ldap_Filter_Abstract
  */
 // require_once 'Zend/Ldap/Filter/Abstract.php';
 /**
  * @see Zend_Ldap_Filter_String
  */
 // require_once 'Zend/Ldap/Filter/String.php';
 
 /**
  * Zend_Ldap_Filter_Logical provides a base implementation for a grouping filter.
  *
  * @category   Zend
  * @package    Zend_Ldap
  * @subpackage 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
  */
 abstract class Zend_Ldap_Filter_Logical extends Zend_Ldap_Filter_Abstract
 {
     const TYPE_AND = '&';
     const TYPE_OR  = '|';
 
     /**
      * All the sub-filters for this grouping filter.
      *
      * @var array
      */
     private $_subfilters;
 
     /**
      * The grouping symbol.
      *
      * @var string
      */
     private $_symbol;
 
     /**
      * Creates a new grouping filter.
      *
      * @param array  $subfilters
      * @param string $symbol
      */
     protected function __construct(array $subfilters, $symbol)
     {
         foreach ($subfilters as $key => $s) {
             if (is_string($s)) $subfilters[$key] = new Zend_Ldap_Filter_String($s);
             else if (!($s instanceof Zend_Ldap_Filter_Abstract)) {
                 /**
                  * @see Zend_Ldap_Filter_Exception
                  */
                 // require_once 'Zend/Ldap/Filter/Exception.php';
                 throw new Zend_Ldap_Filter_Exception('Only strings or Zend_Ldap_Filter_Abstract allowed.');
             }
         }
         $this->_subfilters = $subfilters;
         $this->_symbol = $symbol;
     }
 
     /**
      * Adds a filter to this grouping filter.
      *
      * @param  Zend_Ldap_Filter_Abstract $filter
      * @return Zend_Ldap_Filter_Logical
      */
     public function addFilter(Zend_Ldap_Filter_Abstract $filter)
     {
         $new = clone $this;
         $new->_subfilters[] = $filter;
         return $new;
     }
 
     /**
      * Returns a string representation of the filter.
      *
      * @return string
      */
     public function toString()
     {
         $return = '(' . $this->_symbol;
         foreach ($this->_subfilters as $sub) $return .= $sub->toString();
         $return .= ')';
         return $return;
     }
 }