ImmutableEventDispatcher.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\EventDispatcher;


/**
 * A read-only proxy for an event dispatcher.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
class ImmutableEventDispatcher implements EventDispatcherInterface {

  /**
   * The proxied dispatcher.
   * @var EventDispatcherInterface
   */
  private $dispatcher;

  /**
   * Creates an unmodifiable proxy for an event dispatcher.
   *
   * @param EventDispatcherInterface $dispatcher The proxied event dispatcher.
   */
  public function __construct(EventDispatcherInterface $dispatcher) {
    $this->dispatcher = $dispatcher;
  }

  /**
   * {@inheritdoc}
   */
  public function dispatch($eventName, Event $event = null) {
    return $this->dispatcher
      ->dispatch($eventName, $event);
  }

  /**
   * {@inheritdoc}
   */
  public function addListener($eventName, $listener, $priority = 0) {
    throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  }

  /**
   * {@inheritdoc}
   */
  public function addSubscriber(EventSubscriberInterface $subscriber) {
    throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  }

  /**
   * {@inheritdoc}
   */
  public function removeListener($eventName, $listener) {
    throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  }

  /**
   * {@inheritdoc}
   */
  public function removeSubscriber(EventSubscriberInterface $subscriber) {
    throw new \BadMethodCallException('Unmodifiable event dispatchers must not be modified.');
  }

  /**
   * {@inheritdoc}
   */
  public function getListeners($eventName = null) {
    return $this->dispatcher
      ->getListeners($eventName);
  }

  /**
   * {@inheritdoc}
   */
  public function hasListeners($eventName = null) {
    return $this->dispatcher
      ->hasListeners($eventName);
  }

}