private function checkImage($path)
    {
        if (!file_exists($this->getWebDirectory() . '/' . $path) && !file_exists($path)) {
            throw new NotFoundException(sprintf("Unable to find the image \"%s\" to cache", $path));
        }

        if (!is_file($this->getWebDirectory() . '/' . $path) && !is_file($path)) {
            throw new HttpException(400, sprintf('[ImBundle] "%s" is no file', $path));
        }
    }