symfony/src/Symfony/Component/EventDispatcher/EventDispatcher.php

<?php

/*
 * 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 LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */

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.
 *
 * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @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>
 *
 * @api
 */
class EventDispatcher implements EventDispatcherInterface
{
    private $listeners = array();

    /**
     * @see EventDispatcherInterface::dispatch
     *
     * @api
     */
    public function dispatch($eventName, Event $event = null)
    {
        if (!isset($this->listeners[$eventName])) {
            return;
        }

        if (null === $event) {
            $event = new Event();
        }

        $this->doDispatch($this->getListeners($eventName), $eventName, $event);
    }

    /**
     * @see EventDispatcherInterface::getListeners
     *
     * @api
     */
    public function getListeners($eventName = null)
    {
        if (null !== $eventName) {
            return $this->sortListeners($eventName);
        }

        $sorted = array();
        foreach (array_keys($this->listeners) as $eventName) {
            $sorted[$eventName] = $this->sortListeners($eventName);
        }

        return $sorted;
    }

    /**
     * @see EventDispatcherInterface::hasListeners
     *
     * @api
     */
    public function hasListeners($eventName = null)
    {
        return (Boolean) count($this->getListeners($eventName));
    }

    /**
     * @see EventDispatcherInterface::addListener
     *
     * @api
     */
    public function addListener($eventName, $listener, $priority = 0)
    {
        if (!isset($this->listeners[$eventName][$priority])) {
            if (!isset($this->listeners[$eventName])) {
                $this->listeners[$eventName] = array();
            }
            $this->listeners[$eventName][$priority] = array();
        }

        $this->listeners[$eventName][$priority][] = $listener;
    }

    /**
     * @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, $listeners))) {
                unset($this->listeners[$eventName][$priority][$key]);
            }
        }
    }

    /**
     * @see EventDispatcherInterface::addSubscriber
     */
    public function addSubscriber(EventSubscriberInterface $subscriber, $priority = 0)
    {
        foreach ($subscriber->getSubscribedEvents() as $eventName => $method) {
            $this->addListener($eventName, array($subscriber, $method), $priority);
        }
    }

    /**
     * @see EventDispatcherInterface::removeSubscriber
     */
    public function removeSubscriber(EventSubscriberInterface $subscriber)
    {
        foreach ($subscriber->getSubscribedEvents() as $eventName => $method) {
            $this->removeListener($eventName, array($subscriber, $method));
        }
    }

    /**
     * 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)
    {
        if (!isset($this->listeners[$eventName])) {
            return array();
        }

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

        return call_user_func_array('array_merge', $this->listeners[$eventName]);
    }
}