<?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.
 * @package Swift
 * @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];
  }
  
}
