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<?php
/**
 * @package   FOF
 * @copyright Copyright (c)2010-2022 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license   GNU General Public License version 3, or later
 */

namespace FOF40\Event;

defined('_JEXEC') || die;

use ReflectionMethod;
use ReflectionObject;

class Observer
{
	/** @var   Observable  The object to observe */
	protected $subject;

	protected $events;

	/**
	 * Creates the observer and attaches it to the observable subject object
	 *
	 * @param   Observable  $subject  The observable object to attach the observer to
	 */
	function __construct(Observable &$subject)
	{
		// Attach this observer to the subject
		$subject->attach($this);

		// Store a reference to the subject object
		$this->subject = $subject;
	}

	/**
	 * Returns the list of events observable by this observer. Set the $this->events array manually for faster
	 * processing, or let this method use reflection to return a list of all public methods.
	 *
	 * @return  array
	 */
	public function getObservableEvents()
	{
		if (is_null($this->events))
		{
			// Assign an empty array to protect us from behaviours without any valid method
			$this->events = [];

			$reflection = new ReflectionObject($this);
			$methods    = $reflection->getMethods(ReflectionMethod::IS_PUBLIC);

			foreach ($methods as $m)
			{
				if ($m->name == 'getObservableEvents')
				{
					continue;
				}

				if ($m->name == '__construct')
				{
					continue;
				}

				$this->events[] = $m->name;
			}
		}

		return $this->events;
	}
}