spanner-data-validator-java/src/main/java/com/google/migration/Helpers.java [61:77]:
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  public static UUID bigIntToUUID(BigInteger in) {
    long low = in.longValue();
    long high = in.shiftRight(64).longValue();

    return new UUID(high, low);
  }

  public static BigInteger uuidToBigInt(UUID in) {
    // https://stackoverflow.com/questions/55752927/how-to-convert-an-unsigned-long-to-biginteger
    final BigInteger MASK_64 =
        BigInteger.ONE.shiftLeft(64).subtract(BigInteger.ONE);

    BigInteger msb = BigInteger.valueOf(in.getMostSignificantBits()).and(MASK_64).shiftLeft(64);
    BigInteger lsb = BigInteger.valueOf(in.getLeastSignificantBits()).and(MASK_64);
    BigInteger retVal = msb.or(lsb);

    return retVal;
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spanner-data-validator-java/src/main/java/com/google/migration/partitioning/UUIDHelpers.java [23:39]:
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  public static UUID bigIntToUUID(BigInteger in) {
    long low = in.longValue();
    long high = in.shiftRight(64).longValue();

    return new UUID(high, low);
  }

  public static BigInteger uuidToBigInt(UUID in) {
    // https://stackoverflow.com/questions/55752927/how-to-convert-an-unsigned-long-to-biginteger
    final BigInteger MASK_64 =
        BigInteger.ONE.shiftLeft(64).subtract(BigInteger.ONE);

    BigInteger msb = BigInteger.valueOf(in.getMostSignificantBits()).and(MASK_64).shiftLeft(64);
    BigInteger lsb = BigInteger.valueOf(in.getLeastSignificantBits()).and(MASK_64);
    BigInteger retVal = msb.or(lsb);

    return retVal;
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