Converters for UUID and String to ByteString for Scala

ByteStringConverters.scala

object ByteStringConverters {
  implicit val DefaultByteOrder = ByteOrder.BIG_ENDIAN

  implicit class UUIDWithToByteString(uuid: UUID) {
    def toByteString = ByteString(
      ByteBuffer
        .allocate(16)
        .putLong(uuid.getMostSignificantBits)
        .putLong(8, uuid.getLeastSignificantBits)
    )
  }

  implicit class StringWithToByteString(s: String) {
    def toByteString = ByteString(s.getBytes("UTF-8"))
  }

  implicit class ByteWithToByteString(x: Byte) {
    def toByteString = ByteString(x)
  }

  implicit class ShortWithToByteString(x: Short) {
    def toByteString = new ByteStringBuilder().putShort(x).result()
  }

  implicit class IntWithToByteString(x: Int) {
    def toByteString = new ByteStringBuilder().putInt(x).result()
  }

  implicit class ByteStringWithToBasicTypes(bytes: ByteString) {
    def toShort: Short = {
      require (bytes.length == 2)
      (((bytes(0) & 0xFF) << 8) | (bytes(1) & 0xFF)).asInstanceOf[Short]
    }

    def toInt: Int = {
      require(bytes.length == 4)
      ((bytes(0) & 0xFF) << 24) |
      ((bytes(1) & 0xFF) << 16) |
      ((bytes(2) & 0xFF) << 8) |
      (bytes(3) & 0xFF)
    }
  }
}