Source for file EventTrigger.abstract.php

<?php
/**
 * @since Jul 18, 2005
 * @package harmoni.architecture.events
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: EventTrigger.abstract.php,v 1.3 2007/09/04 20:25:30 adamfranco Exp $
 */ 
 
require_once(HARMONI."/Primitives/Objects/SObject.class.php");
 
/**
 * The event trigger is an abstract class which handles the aggregation of {@link EventListener}s and can trigger events.
 * 
 * @since Jul 18, 2005
 * @package harmoni.architecture.events
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: EventTrigger.abstract.php,v 1.3 2007/09/04 20:25:30 adamfranco Exp $
 * @abstract
 */
class EventTrigger extends SObject {
    /**
     * @var array $_eventListeners 
     * @access private
     */
    var $_eventListeners = array();
    
    /**
     * Adds an {@link EventListener} to be triggered whenever an event is thrown.
     * @param string $eventType The string event type for which this {@link EventListener} is listening (example: "edu.middlebury.harmoni.action_executed")
     * @param ref object $eventListener the {@link EventListener} object.
     * @access public
     * @return ref object
     */
    function addEventListener ($eventListener) {
        ArgumentValidator::validate($eventListener, HasMethodsValidatorRule::getRule("handleEvent"), true);
//        if (!isset($this->_eventListeners[$eventType]) || !is_array($this->_eventListeners[$eventType])) {
//            $this->_eventListeners[$eventType] = array();
//        }
        
//        $this->_eventListeners[$eventType][] =$eventListener;
        $this->_eventListeners[] =$eventListener;
    }
    
    /**
     * Notifies all of the {@link EventListener}s that have been added that an event has
     * occured.
     * @param string $eventType The event type string.
     * @param ref object $source The source object of this event.
     * @param optional array $context An array of contextual parameters for the specific event. The content of the array will depend on the event.
     * @access public
     * @return void 
     */
    function triggerEvent ($eventType, $source, $context = null) {
//        print "event triggered: $eventType<br/>";
//        if (isset($this->_eventListeners[$eventType]) && is_array($this->_eventListeners[$eventType])) {
//            $list =$this->_eventListeners[$eventType];
//            foreach (array_keys($list) as $key) {
//                $list[$key]->handleEvent($eventType, $source, $context);
//            }
//        }
        $list =$this->_eventListeners;
        foreach (array_keys($list) as $key) {
            $list[$key]->handleEvent($eventType, $source, $context);
        }
    }
}
 
?>