de.aristaflow.adept2.util

Class UUIDTools.UUIDComparator

java.lang.Object

de.aristaflow.adept2.util.UUIDTools.UUIDComparator

All Implemented Interfaces:

SerialisableComparator<java.util.UUID>, java.io.Serializable, java.util.Comparator<java.util.UUID>

Enclosing class:

UUIDTools

protected static class UUIDTools.UUIDComparator
extends java.lang.Object
implements SerialisableComparator<java.util.UUID>

A UUID comparator comparing UUIDs unsigned, that is a leading 7 is less than a leading 8. Signed it would be vice versa since 8 is negative.

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	UUIDComparator() Creates a new UUID comparator comparing UUIDs unsigned, that is a leading 7 is less than a leading 8.

Method Summary

Modifier and Type	Method and Description
int	compare(java.util.UUID u1, java.util.UUID u2)
protected int	compareUnsigned(long l1, long l2) Compares the designated longs unsigned, that is all negative longs will be greater than all positive longs and negative longs will be reverse ordered, that is numerical less will be more.

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

protected UUIDComparator()

Creates a new UUID comparator comparing UUIDs unsigned, that is a leading 7 is less than a leading 8. Signed it would be vice versa since 8 is negative.

Method Detail

compareUnsigned

protected int compareUnsigned(long l1,
                              long l2)

Compares the designated longs unsigned, that is all negative longs will be greater than all positive longs and negative longs will be reverse ordered, that is numerical less will be more. This allows for a nice ordering of the string representations of UUIDs.

Parameters:

l1 - The first long to compare.

l2 - The second long to compare.

Returns:

-1 if the first long is less than the second, 0 if both are equal and 1 if the first long is greater than the second, all treated unsigned.

compare

public int compare(java.util.UUID u1,
                   java.util.UUID u2)

Specified by:

compare in interface java.util.Comparator<java.util.UUID>