public function isRegistered($identifier)
    {
        if(strpos($identifier, '.') !== false )
        {
            $identifier = $this->getIdentifier($identifier);
            $class      = $this->getObject('manager')->getClass($identifier);

            if(!$class || !array_key_exists('KTranslatorLocatorInterface', class_implements($class)))
            {
                throw new UnexpectedValueException(
                    'Locator: '.$identifier.' does not implement KTranslatorLocatorInterface'
                );
            }

            $name = $class::getName();
        }
        else $name = $identifier;

        $result = in_array($name, $this->getLocators());
        return $result;
    }