/**
* Add an event subscriber
*
* @param EventSubscriberInterface $subscriber The event subscriber to add
* @return EventDispatcherAbstract
*/
public function addEventSubscriber(EventSubscriberInterface $subscriber, $priority = null)
{
$handle = $subscriber->getHandle();
if (!isset($this->_subscribers[$handle])) {
$subscriptions = $subscriber->getSubscriptions();
$priority = is_int($priority) ? $priority : $subscriber->getPriority();
foreach ($subscriptions as $name => $listener) {
$this->addEventListener($name, $listener, $priority);
}
$this->_subscribers[$handle] = $subscriber;
}
return $this;
}
