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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\EventDispatcher;
  13  
  14  /**
  15   * A read-only proxy for an event dispatcher.
  16   *
  17   * @author Bernhard Schussek <bschussek@gmail.com>
  18   */
  19  class ImmutableEventDispatcher implements EventDispatcherInterface
  20  {
  21      /**
  22       * The proxied dispatcher.
  23       *
  24       * @var EventDispatcherInterface
  25       */
  26      private $dispatcher;
  27  
  28      /**
  29       * Creates an unmodifiable proxy for an event dispatcher.
  30       *
  31       * @param EventDispatcherInterface $dispatcher The proxied event dispatcher.
  32       */
  33      public function __construct(EventDispatcherInterface $dispatcher)
  34      {
  35          $this->dispatcher = $dispatcher;
  36      }
  37  
  38      /**
  39       * {@inheritdoc}
  40       */
  41      public function dispatch($eventName, Event $event = null)
  42      {
  43          return $this->dispatcher->dispatch($eventName, $event);
  44      }
  45  
  46      /**
  47       * {@inheritdoc}
  48       */
  49      public function addListener($eventName, $listener, $priority = 0)
  50      {
  51          throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  52      }
  53  
  54      /**
  55       * {@inheritdoc}
  56       */
  57      public function addSubscriber(EventSubscriberInterface $subscriber)
  58      {
  59          throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  60      }
  61  
  62      /**
  63       * {@inheritdoc}
  64       */
  65      public function removeListener($eventName, $listener)
  66      {
  67          throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  68      }
  69  
  70      /**
  71       * {@inheritdoc}
  72       */
  73      public function removeSubscriber(EventSubscriberInterface $subscriber)
  74      {
  75          throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  76      }
  77  
  78      /**
  79       * {@inheritdoc}
  80       */
  81      public function getListeners($eventName = null)
  82      {
  83          return $this->dispatcher->getListeners($eventName);
  84      }
  85  
  86      /**
  87       * {@inheritdoc}
  88       */
  89      public function hasListeners($eventName = null)
  90      {
  91          return $this->dispatcher->hasListeners($eventName);
  92      }
  93  }