public static function assetFileTypeExists($sAssetFileType)
    {
        if (!is_string($sAssetFileType)) {
            throw new \InvalidArgumentException('Asset file type expects string, "' . gettype($sAssetFileType) . '" given');
        }
        switch ($sAssetFileType) {
            case self::ASSET_CSS:
            case self::ASSET_LESS:
            case self::ASSET_JS:
            case self::ASSET_MEDIA:
                return true;
            default:
                return false;
        }
    }