lychee/php/modules/Plugins.php

<?php

###
# @name			Plugins Module
# @copyright	2015 by Tobias Reich
###

if (!defined('LYCHEE')) exit('Error: Direct access is not allowed!');

final class Plugins implements \SplSubject {

	private static $instance = null;

	private $observers = array();

	public $action = null;
	public $args = null;

	public static function get() {

		if (!self::$instance) {

			$files = Settings::get()['plugins'];

			self::$instance = new self($files);

		}

		return self::$instance;

	}

	private function __construct(array $plugins) {

		# Load plugins
		foreach ($plugins as $plugin) {

			if ($plugin==='') continue;

			$this->attach(new $plugin);

		}

		return true;

	}

	private function __clone() {

		# Magic method clone is empty to prevent duplication of plugins

	}

	public function attach(\SplObserver $observer) {

		if (!isset($observer)) return false;

		# Add observer
		$this->observers[] = $observer;

		return true;

	}

	public function detach(\SplObserver $observer) {

		if (!isset($observer)) return false;

		# Remove observer
		$key = array_search($observer, $this->observers, true);
		if ($key) unset($this->observers[$key]);

		return true;

	}

	public function notify() {

		# Notify each observer
		foreach ($this->observers as $value) $value->update($this);

		return true;

	}

	public function activate($action, $args) {

		if (!isset($action, $args)) return false;

		# Save vars
		$this->action	= $action;
		$this->args		= $args;

		# Notify observers
		$this->notify();

		return true;

	}

}

?>