EventManager.php

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<?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 LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */
 
namespace Doctrine\Common;
 
use Doctrine\Common\Events\Event;
 
class EventManager
{
    private $_listeners = array();
 
    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);
            }
        }
    }
 
    public function getListeners($event = null)
    {
        return $event ? $this->_listeners[$event] : $this->_listeners;
    }
 
    public function hasListeners($event)
    {
        return isset($this->_listeners[$event]) && $this->_listeners[$event];
    }
 
    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;
        }
    }
    
    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]);
            }
        }
    }
    
    public function addEventSubscriber(EventSubscriber $subscriber)
    {
        $this->addEventListener($subscriber->getSubscribedEvents(), $subscriber);
    }
}