class ImmutableEventDispatcher

ImmutableEventDispatcherTest.php in drupal/core/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/Tests/ImmutableEventDispatcherTest.php

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);
  }

}