Initial import.

vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/ContainerAwareEventDispatcher.php

@@ -0,0 +1,202 @@
+<?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;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Lazily loads listeners and subscribers from the dependency injection
+ * container.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ * @author Jordan Alliot <jordan.alliot@gmail.com>
+ */
+class ContainerAwareEventDispatcher extends EventDispatcher
+{
+    /**
+     * The container from where services are loaded.
+     *
+     * @var ContainerInterface
+     */
+    private $container;
+
+    /**
+     * The service IDs of the event listeners and subscribers.
+     *
+     * @var array
+     */
+    private $listenerIds = array();
+
+    /**
+     * The services registered as listeners.
+     *
+     * @var array
+     */
+    private $listeners = array();
+
+    /**
+     * Constructor.
+     *
+     * @param ContainerInterface $container A ContainerInterface instance
+     */
+    public function __construct(ContainerInterface $container)
+    {
+        $this->container = $container;
+    }
+
+    /**
+     * Adds a service as event listener.
+     *
+     * @param string $eventName Event for which the listener is added
+     * @param array  $callback  The service ID of the listener service & the method
+     *                          name that has to be called
+     * @param int    $priority  The higher this value, the earlier an event listener
+     *                          will be triggered in the chain.
+     *                          Defaults to 0.
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function addListenerService($eventName, $callback, $priority = 0)
+    {
+        if (!is_array($callback) || 2 !== count($callback)) {
+            throw new \InvalidArgumentException('Expected an array("service", "method") argument');
+        }
+
+        $this->listenerIds[$eventName][] = array($callback[0], $callback[1], $priority);
+    }
+
+    public function removeListener($eventName, $listener)
+    {
+        $this->lazyLoad($eventName);
+
+        if (isset($this->listenerIds[$eventName])) {
+            foreach ($this->listenerIds[$eventName] as $i => $args) {
+                list($serviceId, $method, $priority) = $args;
+                $key = $serviceId.'.'.$method;
+                if (isset($this->listeners[$eventName][$key]) && $listener === array($this->listeners[$eventName][$key], $method)) {
+                    unset($this->listeners[$eventName][$key]);
+                    if (empty($this->listeners[$eventName])) {
+                        unset($this->listeners[$eventName]);
+                    }
+                    unset($this->listenerIds[$eventName][$i]);
+                    if (empty($this->listenerIds[$eventName])) {
+                        unset($this->listenerIds[$eventName]);
+                    }
+                }
+            }
+        }
+
+        parent::removeListener($eventName, $listener);
+    }
+
+    /**
+     * @see EventDispatcherInterface::hasListeners()
+     */
+    public function hasListeners($eventName = null)
+    {
+        if (null === $eventName) {
+            return (bool) count($this->listenerIds) || (bool) count($this->listeners);
+        }
+
+        if (isset($this->listenerIds[$eventName])) {
+            return true;
+        }
+
+        return parent::hasListeners($eventName);
+    }
+
+    /**
+     * @see EventDispatcherInterface::getListeners()
+     */
+    public function getListeners($eventName = null)
+    {
+        if (null === $eventName) {
+            foreach (array_keys($this->listenerIds) as $serviceEventName) {
+                $this->lazyLoad($serviceEventName);
+            }
+        } else {
+            $this->lazyLoad($eventName);
+        }
+
+        return parent::getListeners($eventName);
+    }
+
+    /**
+     * Adds a service as event subscriber.
+     *
+     * @param string $serviceId The service ID of the subscriber service
+     * @param string $class     The service's class name (which must implement EventSubscriberInterface)
+     */
+    public function addSubscriberService($serviceId, $class)
+    {
+        foreach ($class::getSubscribedEvents() as $eventName => $params) {
+            if (is_string($params)) {
+                $this->listenerIds[$eventName][] = array($serviceId, $params, 0);
+            } elseif (is_string($params[0])) {
+                $this->listenerIds[$eventName][] = array($serviceId, $params[0], isset($params[1]) ? $params[1] : 0);
+            } else {
+                foreach ($params as $listener) {
+                    $this->listenerIds[$eventName][] = array($serviceId, $listener[0], isset($listener[1]) ? $listener[1] : 0);
+                }
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * Lazily loads listeners for this event from the dependency injection
+     * container.
+     *
+     * @throws \InvalidArgumentException if the service is not defined
+     */
+    public function dispatch($eventName, Event $event = null)
+    {
+        $this->lazyLoad($eventName);
+
+        return parent::dispatch($eventName, $event);
+    }
+
+    public function getContainer()
+    {
+        return $this->container;
+    }
+
+    /**
+     * Lazily loads listeners for this event from the dependency injection
+     * container.
+     *
+     * @param string $eventName The name of the event to dispatch. The name of
+     *                          the event is the name of the method that is
+     *                          invoked on listeners.
+     */
+    protected function lazyLoad($eventName)
+    {
+        if (isset($this->listenerIds[$eventName])) {
+            foreach ($this->listenerIds[$eventName] as $args) {
+                list($serviceId, $method, $priority) = $args;
+                $listener = $this->container->get($serviceId);
+
+                $key = $serviceId.'.'.$method;
+                if (!isset($this->listeners[$eventName][$key])) {
+                    $this->addListener($eventName, array($listener, $method), $priority);
+                } elseif ($listener !== $this->listeners[$eventName][$key]) {
+                    parent::removeListener($eventName, array($this->listeners[$eventName][$key], $method));
+                    $this->addListener($eventName, array($listener, $method), $priority);
+                }
+
+                $this->listeners[$eventName][$key] = $listener;
+            }
+        }
+    }
+}