private static function init() {
        if (self::$logDebug === null) {
            $loglevel        = Logger::getLogLevel(__CLASS__);
            self::$logDebug  = ($loglevel <= L_DEBUG );
            self::$logInfo   = ($loglevel <= L_INFO  );
            self::$logNotice = ($loglevel <= L_NOTICE);
        }
    }