io.virtdata.basicsmappers.from_long.to_uuid

Class ToUUID

java.lang.Object

io.virtdata.basicsmappers.from_long.to_uuid.ToUUID

All Implemented Interfaces:

LongFunction<UUID>

public class ToUUID
extends Object
implements LongFunction<UUID>

This function creates a non-random UUID in the type 4 version (Random). It always puts the same value in the MSB position of the UUID format. The input value is put in the LSB position.

 xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx
 mmmmmmmm-mmmm-Mmmm-Llll-llllllllllll
               4    3
 

As shown above, the LSB position does not have the complication of having a version identifier (position M) dividing the dynamic range of the data type. For this reason, only the LSB side is used for this mapper, which allows an effective range of Long.MAX_VALUE/8, given the loss of 3 digits of precision. This function is suitable for deterministic testing of scenarios which depend on type 4 UUIDs, but without the mandated randomness that makes testing difficult. Just be aware that the MSB will always contain value 0x0123456789ABCDEFL unless you specify a different long value to pre-fill it with.

Constructor Summary

Constructors

Constructor and Description
ToUUID()
ToUUID(long msbs)

Method Summary

Modifier and Type	Method and Description
UUID	apply(long value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ToUUID

public ToUUID()

ToUUID

public ToUUID(long msbs)

Method Detail

apply

public UUID apply(long value)

Specified by:

apply in interface LongFunction<UUID>