<?php

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/*

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* This file is part of the Symfony package.

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*

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* (c) Fabien Potencier <fabien@symfony.com>

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*

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* For the full copyright and license information, please view the LICENSE

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* file that was distributed with this source code.

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*/

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namespace Symfony\Component\EventDispatcher;

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use Symfony\Component\DependencyInjection\ContainerInterface;

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/**

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* Lazily loads listeners and subscribers from the dependency injection

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* container.

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*

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* @author Fabien Potencier <fabien@symfony.com>

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* @author Bernhard Schussek <bschussek@gmail.com>

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* @author Jordan Alliot <jordan.alliot@gmail.com>

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*/

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class ContainerAwareEventDispatcher extends EventDispatcher

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{

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private $container;

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/**

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* The service IDs of the event listeners and subscribers.

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*/

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private $listenerIds = array();

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/**

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* The services registered as listeners.

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*/

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private $listeners = array();

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public function __construct(ContainerInterface $container)

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{

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$this->container = $container;

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}

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/**

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* Adds a service as event listener.

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*

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* @param string $eventName Event for which the listener is added

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* @param array $callback The service ID of the listener service & the method

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* name that has to be called

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* @param int $priority The higher this value, the earlier an event listener

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* will be triggered in the chain.

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* Defaults to 0.

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*

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* @throws \InvalidArgumentException

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*/

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public function addListenerService($eventName, $callback, $priority = 0)

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{

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if (!\is_array($callback) || 2 !== \count($callback)) {

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throw new \InvalidArgumentException('Expected an array("service", "method") argument');

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}

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$this->listenerIds[$eventName][] = array($callback[0], $callback[1], $priority);

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}

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public function removeListener($eventName, $listener)

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{

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$this->lazyLoad($eventName);

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if (isset($this->listenerIds[$eventName])) {

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foreach ($this->listenerIds[$eventName] as $i => $args) {

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list($serviceId, $method) = $args;

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$key = $serviceId.'.'.$method;

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if (isset($this->listeners[$eventName][$key]) && $listener === array($this->listeners[$eventName][$key], $method)) {

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unset($this->listeners[$eventName][$key]);

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if (empty($this->listeners[$eventName])) {

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unset($this->listeners[$eventName]);

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}

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unset($this->listenerIds[$eventName][$i]);

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if (empty($this->listenerIds[$eventName])) {

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unset($this->listenerIds[$eventName]);

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}

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}

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}

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}

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parent::removeListener($eventName, $listener);

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}

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/**

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* {@inheritdoc}

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*/

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public function hasListeners($eventName = null)

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{

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if (null === $eventName) {

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return $this->listenerIds || $this->listeners || parent::hasListeners();

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}

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if (isset($this->listenerIds[$eventName])) {

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return true;

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}

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return parent::hasListeners($eventName);

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}

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/**

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* {@inheritdoc}

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*/

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public function getListeners($eventName = null)

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{

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if (null === $eventName) {

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foreach ($this->listenerIds as $serviceEventName => $args) {

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$this->lazyLoad($serviceEventName);

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}

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} else {

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$this->lazyLoad($eventName);

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}

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return parent::getListeners($eventName);

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}

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/**

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* {@inheritdoc}

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*/

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public function getListenerPriority($eventName, $listener)

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{

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$this->lazyLoad($eventName);

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return parent::getListenerPriority($eventName, $listener);

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}

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/**

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* Adds a service as event subscriber.

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*

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* @param string $serviceId The service ID of the subscriber service

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* @param string $class The service's class name (which must implement EventSubscriberInterface)

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*/

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public function addSubscriberService($serviceId, $class)

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{

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foreach ($class::getSubscribedEvents() as $eventName => $params) {

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if (\is_string($params)) {

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$this->listenerIds[$eventName][] = array($serviceId, $params, 0);

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} elseif (\is_string($params[0])) {

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$this->listenerIds[$eventName][] = array($serviceId, $params[0], isset($params[1]) ? $params[1] : 0);

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} else {

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foreach ($params as $listener) {

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$this->listenerIds[$eventName][] = array($serviceId, $listener[0], isset($listener[1]) ? $listener[1] : 0);

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}

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}

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}

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}

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public function getContainer()

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{

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return $this->container;

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}

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/**

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* Lazily loads listeners for this event from the dependency injection

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* container.

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*

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* @param string $eventName The name of the event to dispatch. The name of

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* the event is the name of the method that is

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* invoked on listeners.

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*/

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protected function lazyLoad($eventName)

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{

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if (isset($this->listenerIds[$eventName])) {

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foreach ($this->listenerIds[$eventName] as $args) {

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list($serviceId, $method, $priority) = $args;

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$listener = $this->container->get($serviceId);

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$key = $serviceId.'.'.$method;

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if (!isset($this->listeners[$eventName][$key])) {

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$this->addListener($eventName, array($listener, $method), $priority);

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} elseif ($this->listeners[$eventName][$key] !== $listener) {

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parent::removeListener($eventName, array($this->listeners[$eventName][$key], $method));

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$this->addListener($eventName, array($listener, $method), $priority);

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}

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$this->listeners[$eventName][$key] = $listener;

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}

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}

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}

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}

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