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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Event
 *
 * @copyright   (C) 2005 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * JEvent Class
 *
 * @since       1.5
 * @deprecated  4.0  The CMS' Event classes will be replaced with the `joomla/event` package
 */
abstract class JEvent extends JObject
{
	/**
	 * Event object to observe.
	 *
	 * @var    object
	 * @since  2.5
	 */
	protected $_subject = null;

	/**
	 * Constructor
	 *
	 * @param   object  &$subject  The object to observe.
	 *
	 * @since   2.5
	 */
	public function __construct(&$subject)
	{
		// Register the observer ($this) so we can be notified
		$subject->attach($this);

		// Set the subject to observe
		$this->_subject = &$subject;
	}

	/**
	 * Method to trigger events.
	 * The method first generates the even from the argument array. Then it unsets the argument
	 * since the argument has no bearing on the event handler.
	 * If the method exists it is called and returns its return value. If it does not exist it
	 * returns null.
	 *
	 * @param   array  &$args  Arguments
	 *
	 * @return  mixed  Routine return value
	 *
	 * @since   1.5
	 */
	public function update(&$args)
	{
		// First let's get the event from the argument array.  Next we will unset the
		// event argument as it has no bearing on the method to handle the event.
		$event = $args['event'];
		unset($args['event']);

		/*
		 * If the method to handle an event exists, call it and return its return
		 * value.  If it does not exist, return null.
		 */
		if (method_exists($this, $event))
		{
			return call_user_func_array(array($this, $event), array_values($args));
		}
	}
}