org.apache.commons.collections.comparators
Class ReverseComparator

java.lang.Object
  |
  +--org.apache.commons.collections.comparators.ReverseComparator

All Implemented Interfaces:

java.util.Comparator, java.io.Serializable

public class ReverseComparator

extends java.lang.Object

implements java.util.Comparator, java.io.Serializable

Reverses the order of another comparator.

Since:

2.0

Version:

$Id: ReverseComparator.java,v 1.8.2.1 2004/05/22 12:14:04 scolebourne Exp $

Author:

bayard@generationjava.com, Michael A. Smith

See Also:

Serialized Form

Constructor Summary

ReverseComparator()
Creates a comparator that compares objects based on the inverse of their natural ordering.

ReverseComparator(java.util.Comparator comparator)
Creates a reverse comparator that inverts the comparison of the passed in comparator.

Method Summary

int	compare(java.lang.Object o1, java.lang.Object o2)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

ReverseComparator

public ReverseComparator()

Creates a comparator that compares objects based on the inverse of their natural ordering. Using this Constructor will create a ReverseComparator that is functionaly identical to the Comparator returned by java.util.Collections.reverseOrder().

See Also:

Collections.reverseOrder()

ReverseComparator

public ReverseComparator(java.util.Comparator comparator)

Creates a reverse comparator that inverts the comparison of the passed in comparator. If you pass in a null, the ReverseComparator defaults to reversing the natural order, as per java.util.Collections.reverseOrder().

Parameters:

comparator - Comparator to reverse

Method Detail

compare

public int compare(java.lang.Object o1,
                   java.lang.Object o2)

Specified by:

compare in interface java.util.Comparator