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   1  <?php
   2  
   3  /*
   4   * This file is part of SwiftMailer.
   5   * (c) 2004-2009 Chris Corbyn
   6   *
   7   * For the full copyright and license information, please view the LICENSE
   8   * file that was distributed with this source code.
   9   */
  10  
  11  /**
  12   * Creates filters for replacing needles in a string buffer.
  13   *
  14   * @author Chris Corbyn
  15   */
  16  class Swift_StreamFilters_StringReplacementFilterFactory implements Swift_ReplacementFilterFactory
  17  {
  18      /** Lazy-loaded filters */
  19      private $filters = [];
  20  
  21      /**
  22       * Create a new StreamFilter to replace $search with $replace in a string.
  23       *
  24       * @param string $search
  25       * @param string $replace
  26       *
  27       * @return Swift_StreamFilter
  28       */
  29      public function createFilter($search, $replace)
  30      {
  31          if (!isset($this->filters[$search][$replace])) {
  32              if (!isset($this->filters[$search])) {
  33                  $this->filters[$search] = [];
  34              }
  35  
  36              if (!isset($this->filters[$search][$replace])) {
  37                  $this->filters[$search][$replace] = [];
  38              }
  39  
  40              $this->filters[$search][$replace] = new Swift_StreamFilters_StringReplacementFilter($search, $replace);
  41          }
  42  
  43          return $this->filters[$search][$replace];
  44      }
  45  }