com.jalios.util

Class ReverseComparator<T>

java.lang.Object

com.jalios.util.ReverseComparator<T>

All Implemented Interfaces:

java.util.Comparator<T>

public class ReverseComparator<T>
extends java.lang.Object
implements java.util.Comparator<T>

This class is comparator which reverse the ordering of a given comparator.

Version:

$Revision: 21407 $

Author:

Olivier Dedieu

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Comparator<T>	comparator
static java.lang.String	REVISION

Constructor Summary

Constructors

Constructor and Description
ReverseComparator() Defaut constructor reverse NaturalComparator Objects mus be Comparable
ReverseComparator(java.util.Comparator<T> comparator) This constructor will reverse returned value by given comparator.

Method Summary

Modifier and Type	Method and Description
int	compare(T o1, T o2)
java.util.Comparator<T>	getReversedComparator() Retrieve the Comparator this ReverseComparator is reversing or null when the natural Comparator is reversed.

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

Field Detail

REVISION

public static final java.lang.String REVISION

See Also:

Constant Field Values

comparator

protected java.util.Comparator<T> comparator

Constructor Detail

ReverseComparator

public ReverseComparator()

Defaut constructor reverse NaturalComparator Objects mus be Comparable

ReverseComparator

public ReverseComparator(java.util.Comparator<T> comparator)

This constructor will reverse returned value by given comparator.

Parameters:

comparator - used to compare object

Method Detail

getReversedComparator

public java.util.Comparator<T> getReversedComparator()

Retrieve the Comparator this ReverseComparator is reversing or null when the natural Comparator is reversed.

Returns:

the Comparator instance being used or null if we are reversing the natural Comparator of the objects.

compare

public int compare(T o1,
                   T o2)

Specified by:

compare in interface java.util.Comparator<T>