<?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) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Not.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Ldap_Filter_Abstract
 */
require_once 'Zend/Ldap/Filter/Abstract.php';

/**
 * Zend_Ldap_Filter_Not provides a negation filter.
 *
 * @category   Zend
 * @package    Zend_Ldap
 * @subpackage Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Ldap_Filter_Not extends Zend_Ldap_Filter_Abstract
{
    /**
     * The underlying filter.
     *
     * @var Zend_Ldap_Filter_Abstract
     */
    private $_filter;

    /**
     * Creates a Zend_Ldap_Filter_Not.
     *
     * @param Zend_Ldap_Filter_Abstract $filter
     */
    public function __construct(Zend_Ldap_Filter_Abstract $filter)
    {
        $this->_filter = $filter;
    }

    /**
     * Negates the filter.
     *
     * @return Zend_Ldap_Filter_Abstract
     */
    public function negate()
    {
        return $this->_filter;
    }

    /**
     * Returns a string representation of the filter.
     *
     * @return string
     */
    public function toString()
    {
        return '(!' . $this->_filter->toString() . ')';
    }
}