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<?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;
/**
* The EventDispatcherInterface is the central point of Symfony's event listener system.
*
* Listeners are registered on the manager and events are dispatched through the
* manager.
*
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Jonathan Wage <jonwage@gmail.com>
* @author Roman Borschel <roman@code-factory.org>
* @author Bernhard Schussek <bschussek@gmail.com>
* @author Fabien Potencier <fabien@symfony.com>
* @author Jordi Boggiano <j.boggiano@seld.be>
* @author Jordan Alliot <jordan.alliot@gmail.com>
*
* @api
*/
class EventDispatcher implements EventDispatcherInterface
{
private $listeners = array();
private $sorted = array();
/**
* @see EventDispatcherInterface::dispatch
*
* @api
*/
public function dispatch($eventName, Event $event = null)
{
if (null === $event) {
$event = new Event();
}
$event->setDispatcher($this);
$event->setName($eventName);
if (!isset($this->listeners[$eventName])) {
return $event;
}
$this->doDispatch($this->getListeners($eventName), $eventName, $event);
return $event;
}
/**
* @see EventDispatcherInterface::getListeners
*/
public function getListeners($eventName = null)
{
if (null !== $eventName) {
if (!isset($this->sorted[$eventName])) {
$this->sortListeners($eventName);
}
return $this->sorted[$eventName];
}
foreach (array_keys($this->listeners) as $eventName) {
if (!isset($this->sorted[$eventName])) {
$this->sortListeners($eventName);
}
}
return $this->sorted;
}
/**
* @see EventDispatcherInterface::hasListeners
*/
public function hasListeners($eventName = null)
{
return (Boolean) count($this->getListeners($eventName));
}
/**
* @see EventDispatcherInterface::addListener
*
* @api
*/
public function addListener($eventName, $listener, $priority = 0)
{
$this->listeners[$eventName][$priority][] = $listener;
unset($this->sorted[$eventName]);
}
/**
* @see EventDispatcherInterface::removeListener
*/
public function removeListener($eventName, $listener)
{
if (!isset($this->listeners[$eventName])) {
return;
}
foreach ($this->listeners[$eventName] as $priority => $listeners) {
if (false !== ($key = array_search($listener, $listeners, true))) {
unset($this->listeners[$eventName][$priority][$key], $this->sorted[$eventName]);
}
}
}
/**
* @see EventDispatcherInterface::addSubscriber
*
* @api
*/
public function addSubscriber(EventSubscriberInterface $subscriber)
{
foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
if (is_string($params)) {
$this->addListener($eventName, array($subscriber, $params));
} elseif (is_string($params[0])) {
$this->addListener($eventName, array($subscriber, $params[0]), isset($params[1]) ? $params[1] : 0);
} else {
foreach ($params as $listener) {
$this->addListener($eventName, array($subscriber, $listener[0]), isset($listener[1]) ? $listener[1] : 0);
}
}
}
}
/**
* @see EventDispatcherInterface::removeSubscriber
*/
public function removeSubscriber(EventSubscriberInterface $subscriber)
{
foreach ($subscriber->getSubscribedEvents() as $eventName => $params) {
if (is_array($params) && is_array($params[0])) {
foreach ($params as $listener) {
$this->removeListener($eventName, array($subscriber, $listener[0]));
}
} else {
$this->removeListener($eventName, array($subscriber, is_string($params) ? $params : $params[0]));
}
}
}
/**
* Triggers the listeners of an event.
*
* This method can be overridden to add functionality that is executed
* for each listener.
*
* @param array[callback] $listeners The event listeners.
* @param string $eventName The name of the event to dispatch.
* @param Event $event The event object to pass to the event handlers/listeners.
*/
protected function doDispatch($listeners, $eventName, Event $event)
{
foreach ($listeners as $listener) {
call_user_func($listener, $event);
if ($event->isPropagationStopped()) {
break;
}
}
}
/**
* Sorts the internal list of listeners for the given event by priority.
*
* @param string $eventName The name of the event.
*/
private function sortListeners($eventName)
{
$this->sorted[$eventName] = array();
if (isset($this->listeners[$eventName])) {
krsort($this->listeners[$eventName]);
$this->sorted[$eventName] = call_user_func_array('array_merge', $this->listeners[$eventName]);
}
}
}
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