<?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 hide@address.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Filter.php 3693 2007-03-02 18:13:36Z darby $
 */


/**
 * @see Zend_Filter_Interface
 */
require_once 'Zend/Filter/Interface.php';


/**
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Filter implements Zend_Filter_Interface
{
    /**
     * Filter chain
     *
     * @var array
     */
    protected $_filters = array();

    /**
     * Adds a filter to the end of the chain
     *
     * @param  Zend_Filter_Interface $filter
     * @return Zend_Filter Provides a fluent interface
     */
    public function addFilter(Zend_Filter_Interface $filter)
    {
        $this->_filters[] = $filter;
        return $this;
    }

    /**
     * Returns $value filtered through each filter in the chain
     *
     * Filters are run in the order in which they were added to the chain (FIFO)
     *
     * @param  mixed $value
     * @return mixed
     */
    public function filter($value)
    {
        $valueFiltered = $value;
        foreach ($this->_filters as $filter) {
            $valueFiltered = $filter->filter($valueFiltered);
        }
        return $valueFiltered;
    }
}