<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Creates filters for replacing needles in a string buffer.
 *
 * @author  Chris Corbyn
 */
class Swift_StreamFilters_StringReplacementFilterFactory implements Swift_ReplacementFilterFactory
{
    /** Lazy-loaded filters */
    private $_filters = array();

    /**
     * Create a new StreamFilter to replace $search with $replace in a string.
     *
     * @param string $search
     * @param string $replace
     *
     * @return Swift_StreamFilter
     */
    public function createFilter($search, $replace)
    {
        if (!isset($this->_filters[$search][$replace])) {
            if (!isset($this->_filters[$search])) {
                $this->_filters[$search] = array();
            }

            if (!isset($this->_filters[$search][$replace])) {
                $this->_filters[$search][$replace] = array();
            }

            $this->_filters[$search][$replace] = new Swift_StreamFilters_StringReplacementFilter($search, $replace);
        }

        return $this->_filters[$search][$replace];
    }
}
