--- /dev/null
+<?php
+/*
+ * $Id$
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\Common;
+
+/**
+ * The EventManager is the central point of Doctrine's event listener system.
+ * Listeners are registered on the manager and events are dispatched through the
+ * manager.
+ *
+ * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
+ * @link www.doctrine-project.org
+ * @since 2.0
+ * @version $Revision: 3938 $
+ * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ * @author Roman Borschel <roman@code-factory.org>
+ */
+class EventManager
+{
+ /**
+ * Map of registered listeners.
+ * <event> => <listeners>
+ *
+ * @var array
+ */
+ private $_listeners = array();
+
+ /**
+ * Dispatches an event to all registered listeners.
+ *
+ * @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.
+ * @param EventArgs $eventArgs The event arguments to pass to the event handlers/listeners.
+ * If not supplied, the single empty EventArgs instance is used.
+ * @return boolean
+ */
+ public function dispatchEvent($eventName, EventArgs $eventArgs = null)
+ {
+ if (isset($this->_listeners[$eventName])) {
+ $eventArgs = $eventArgs === null ? EventArgs::getEmptyInstance() : $eventArgs;
+
+ foreach ($this->_listeners[$eventName] as $listener) {
+ $listener->$eventName($eventArgs);
+ }
+ }
+ }
+
+ /**
+ * Gets the listeners of a specific event or all listeners.
+ *
+ * @param string $event The name of the event.
+ * @return array The event listeners for the specified event, or all event listeners.
+ */
+ public function getListeners($event = null)
+ {
+ return $event ? $this->_listeners[$event] : $this->_listeners;
+ }
+
+ /**
+ * Checks whether an event has any registered listeners.
+ *
+ * @param string $event
+ * @return boolean TRUE if the specified event has any listeners, FALSE otherwise.
+ */
+ public function hasListeners($event)
+ {
+ return isset($this->_listeners[$event]) && $this->_listeners[$event];
+ }
+
+ /**
+ * Adds an event listener that listens on the specified events.
+ *
+ * @param string|array $events The event(s) to listen on.
+ * @param object $listener The listener object.
+ */
+ public function addEventListener($events, $listener)
+ {
+ // Picks the hash code related to that listener
+ $hash = spl_object_hash($listener);
+
+ foreach ((array) $events as $event) {
+ // Overrides listener if a previous one was associated already
+ // Prevents duplicate listeners on same event (same instance only)
+ $this->_listeners[$event][$hash] = $listener;
+ }
+ }
+
+ /**
+ * Removes an event listener from the specified events.
+ *
+ * @param string|array $events
+ * @param object $listener
+ */
+ public function removeEventListener($events, $listener)
+ {
+ // Picks the hash code related to that listener
+ $hash = spl_object_hash($listener);
+
+ foreach ((array) $events as $event) {
+ // Check if actually have this listener associated
+ if (isset($this->_listeners[$event][$hash])) {
+ unset($this->_listeners[$event][$hash]);
+ }
+ }
+ }
+
+ /**
+ * Adds an EventSubscriber. The subscriber is asked for all the events he is
+ * interested in and added as a listener for these events.
+ *
+ * @param \Doctrine\Common\EventSubscriber $subscriber The subscriber.
+ */
+ public function addEventSubscriber(EventSubscriber $subscriber)
+ {
+ $this->addEventListener($subscriber->getSubscribedEvents(), $subscriber);
+ }
+
+ /**
+ * Removes an EventSubscriber. The subscriber is asked for all the events it is
+ * interested in and removed as a listener for these events.
+ *
+ * @param \Doctrine\Common\EventSubscriber $subscriber The subscriber.
+ */
+ public function removeEventSubscriber(EventSubscriber $subscriber)
+ {
+ $this->removeEventListener($subscriber->getSubscribedEvents(), $subscriber);
+ }
+}