Plugin System

<?php
/*********************************************\
|****************** OPENCMS ******************|
|*********************************************|
|* @author Yannici                           *|
|* @copyright Yannici                        *|
|*********************************************|
|* @since 04.11.2013                         *|
\*********************************************/

class Plugin_system {

    private $_plugins = array();

    public function __construct() {
        $this->load_abstract_class();
        $this->load_plugins();
    }

    private function load_abstract_class() {
        require_once(APPPATH . '/libraries/abstract_plugin.php');
        require_once(APPPATH . '/libraries/abstract_admin_plugin.php');
    }

    public function load_plugin($name) {
        $ref_class = new ReflectionClass(ucfirst($name . '_plugin'));
        return $ref_class->newInstance();
    }

    private function load_plugins() {
        foreach($this->config->item('plugins') As $plugin => $class) {
            if( ! file_exists(APPPATH . '/plugins/' . $plugin . '/' . $plugin . '.php')) {
                show_error('Unable to load your plugin \'' . $plugin . '\'. Please check if this plugin, controller and view exists.');
            } else {
                require_once(APPPATH . '/plugins/' . $plugin . '/' . $plugin . '.php');
                if( ! class_exists($plugin . '_plugin')
                   OR (get_parent_class($plugin . '_plugin') !== 'Abstract_plugin' && get_parent_class($plugin . '_plugin') !== 'Abstract_admin_plugin')) {

                    show_error('Unable to load your plugin \'' . $plugin . '\'. Please check if the plugin is a class and Abstract_plugin or Abstract_admin_plugin is it parent');
                } else {
                    $this->_plugins[$plugin] = array();
                    $this->_plugins['class'] = $class;

                    $this->set_plugin_properties($plugin);
                }
            }
        }
    }

    private function set_plugin_properties($name) {
        $ref_class = new ReflectionClass($name . '_plugin');

        foreach($ref_class->getDefaultProperties() As $p_name => $value) {
            switch($p_name) {
                case 'plugin_technical_name':
                    $this->_plugins[$name]['technical_name'] = $value;
                    break;
                case 'plugin_name':
                    $this->_plugins[$name]['name'] = $value;
                    break;
                case 'plugin_description':
                    $this->_plugins[$name]['description'] = $value;
                    break;
                case 'plugin_author':
                    $this->_plugins[$name]['author'] = $value;
                    break;
                case 'plugin_version':
                    $this->_plugins[$name]['version'] = $value;
                    break;
            }
        }
    }

    public function is_registered_plugin($name, $class) {
        if(isset($this->_plugins[$name])
           && $this->_plugins[$name]['class'] == strtolower($class)) {
            return TRUE;
        }

        return FALSE;
    }

    public function __get($key) {
        if(property_exists($this, $key)) {
            return $this->$key;
        }

        $CI =& get_instance();
        return $CI->$key;
    }
}
?>