Initial import.

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

@@ -0,0 +1,185 @@
+<?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 array_filter($this->sorted);
+    }
+
+    /**
+     * @see EventDispatcherInterface::hasListeners()
+     */
+    public function hasListeners($eventName = null)
+    {
+        return (bool) 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 callable[] $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, $eventName, $this);
+            if ($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]);
+        }
+    }
+}