public static function getInstance() { if (is_null(self::$instance)) { $prefs = Preferences::getInstance(); if (!$prefs) { die_error('get Preferences failed', __FILE__, __LINE__); } $mods_enable = $prefs->get('general', 'module_enable'); if (!in_array('SharedFolderDB', $mods_enable)) { die_error(_('SharedFolderDB module must be enabled'), __FILE__, __LINE__); } $mod_app_name = 'SharedFolderDB_' . $prefs->get('SharedFolderDB', 'enable'); self::$instance = new $mod_app_name(); } return self::$instance; }