1. sfFilterChain.class.php
  2. /**
 * sfFilterChain manages registered filters for a specific context.
 *
 * @package    symfony
 * @subpackage filter
 * @author     Fabien Potencier 
 * @author     Sean Kerr 
 * @version    SVN: $Id: sfFilterChain.class.php 23810 2009-11-12 11:07:44Z Kris.Wallsmith $
 */
  3. class sfFilterChain
  4. {
  5.   protected
  6.     $chain = array(),
  7.     $index = -1;
  9.   /**
  10.    * Loads filters configuration for a given action instance.
  11.    *
  12.    * @param sfComponent $actionInstance A sfComponent instance
  13.    */
  14.   public function loadConfiguration($actionInstance)
  15.   {
  16.     require(sfContext::getInstance()->getConfigCache()->checkConfig('modules/'.$actionInstance->getModuleName().'/config/filters.yml'));
  17.   }
  19.   /**
  20.    * Executes the next filter in this chain.
  21.    */
  22.   public function execute()
  23.   {
  24.     // skip to the next filter
  25.     ++$this->index;
  27.     if ($this->index < count($this->chain))
  28.     {
  29.       if (sfConfig::get('sf_logging_enabled'))
  30.       {
  31.         sfContext::getInstance()->getEventDispatcher()->notify(new sfEvent($this, 'application.log', array(sprintf('Executing filter "%s"', get_class($this->chain[$this->index])))));
  32.       }
  34.       // execute the next filter
  35.       $this->chain[$this->index]->execute($this);
  36.     }
  37.   }
  39.   /**
  40.    * Returns true if the filter chain contains a filter of a given class.
  41.    *
  42.    * @param string $class The class name of the filter
  43.    *
  44.    * @return boolean true if the filter exists, false otherwise
  45.    */
  46.   public function hasFilter($class)
  47.   {
  48.     foreach ($this->chain as $filter)
  49.     {
  50.       if ($filter instanceof $class)
  51.       {
  52.         return true;
  53.       }
  54.     }
  56.     return false;
  57.   }
  59.   /**
  60.    * Registers a filter with this chain.
  61.    *
  62.    * @param sfFilter $filter A sfFilter implementation instance.
  63.    */
  64.   public function register($filter)
  65.   {
  66.     $this->chain[] = $filter;
  67.   }
  68. }
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