protected function validateActionImageStyle($action_id, array &$value)
    {
        $handler = $this->image_style->getActionHandler($action_id);

        if (empty($handler)) {
            return false;
        }

        try {
            $callback = static::get($handler, null, 'validate');
            return call_user_func_array($callback, array(&$value));
        } catch (Exception $ex) {
            return false;
        }
    }