uuid_v3.java

@Description("Generates a deterministic (type 3) UUID using the specified namespace UUID and input name (using MD5 hash)")
@ScalarFunction()
@SqlType(StandardTypes.UUID)
public static Slice uuid_v3(@SqlType(StandardTypes.UUID) Slice nameSpaceUuid,@SqlType(StandardTypes.VARCHAR) Slice name)
{
    java.util.UUID nameUuid = new java.util.UUID(nameSpaceUuid.getLong(0), nameSpaceUuid.getLong(SIZE_OF_LONG));
    byte[] value = name.getBytes();
    byte[] b = Hashing.md5().newHasher()
            .putLong(Long.reverse(nameUuid.getMostSignificantBits()))
            .putLong(Long.reverse(nameUuid.getLeastSignificantBits()))
            .putBytes(value)
            .hash().asBytes();
    long msb = Longs.fromBytes(b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
    long lsb = Longs.fromBytes(b[8], b[9], b[10], b[11], b[12], b[13], b[14], b[15]);
    return wrappedLongArray(msb, lsb);
}