com.fasterxml.uuid

Class UUIDComparator

java.lang.Object

com.fasterxml.uuid.UUIDComparator

All Implemented Interfaces:

Comparator<UUID>

public class UUIDComparator
extends Object
implements Comparator<UUID>

Default UUID comparator is not very useful, since it just does blind byte-by-byte comparison which does not work well for time+location - based UUIDs. Additionally it also uses signed comparisons for longs which can lead to unexpected behavior This comparator does implement proper lexical ordering: starting with type (different types are collated separately), followed by time and location (for time/location based), and simple lexical (byte-by-byte) ordering for name/hash and random variants.

Author:

tatu

Constructor Summary

Constructors

Constructor and Description
UUIDComparator()

Method Summary

Modifier and Type	Method and Description
int	compare(UUID u1, UUID u2)
protected static int	compareUInts(int i1, int i2)
protected static int	compareULongs(long l1, long l2)
static int	staticCompare(UUID u1, UUID u2) Static helper method that can be used instead of instantiating comparator (used by unit tests, can be used by code too)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

UUIDComparator

public UUIDComparator()

Method Detail

compare

public int compare(UUID u1,
                   UUID u2)

Specified by:

compare in interface Comparator<UUID>

staticCompare

public static int staticCompare(UUID u1,
                                UUID u2)

Static helper method that can be used instead of instantiating comparator (used by unit tests, can be used by code too)

compareULongs

protected static final int compareULongs(long l1,
                                         long l2)

compareUInts

protected static final int compareUInts(int i1,
                                        int i2)