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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      private $dispatcher;
  22  
  23      public function __construct(EventDispatcherInterface $dispatcher)
  24      {
  25          $this->dispatcher = $dispatcher;
  26      }
  27  
  28      /**
  29       * {@inheritdoc}
  30       */
  31      public function dispatch($eventName, Event $event = null)
  32      {
  33          return $this->dispatcher->dispatch($eventName, $event);
  34      }
  35  
  36      /**
  37       * {@inheritdoc}
  38       */
  39      public function addListener($eventName, $listener, $priority = 0)
  40      {
  41          throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  42      }
  43  
  44      /**
  45       * {@inheritdoc}
  46       */
  47      public function addSubscriber(EventSubscriberInterface $subscriber)
  48      {
  49          throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  50      }
  51  
  52      /**
  53       * {@inheritdoc}
  54       */
  55      public function removeListener($eventName, $listener)
  56      {
  57          throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  58      }
  59  
  60      /**
  61       * {@inheritdoc}
  62       */
  63      public function removeSubscriber(EventSubscriberInterface $subscriber)
  64      {
  65          throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  66      }
  67  
  68      /**
  69       * {@inheritdoc}
  70       */
  71      public function getListeners($eventName = null)
  72      {
  73          return $this->dispatcher->getListeners($eventName);
  74      }
  75  
  76      /**
  77       * {@inheritdoc}
  78       */
  79      public function getListenerPriority($eventName, $listener)
  80      {
  81          return $this->dispatcher->getListenerPriority($eventName, $listener);
  82      }
  83  
  84      /**
  85       * {@inheritdoc}
  86       */
  87      public function hasListeners($eventName = null)
  88      {
  89          return $this->dispatcher->hasListeners($eventName);
  90      }
  91  }