structure
Class ReverseComparator

java.lang.Object
  structure.ReverseComparator

All Implemented Interfaces:

java.util.Comparator

public class ReverseComparator
extends java.lang.Object
implements java.util.Comparator

Field Summary

protected java.util.Comparator

base

Constructor Summary

ReverseComparator()
Construct a comparator that generates reverse natural comparison

ReverseComparator(java.util.Comparator base)
Construct a comparator that generates reverse of another comparator

Method Summary

int	compare(java.lang.Object a, java.lang.Object b) Compare two values, a and b.
boolean	equals(java.lang.Object b) Returns true if the other object is a NaturalComparator.

Methods inherited from class java.lang.Object

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

Field Detail

base

protected java.util.Comparator base

Constructor Detail

ReverseComparator

public ReverseComparator()

Construct a comparator that generates reverse natural comparison

Postcondition:

constructs a comparator that orders in reverse order

ReverseComparator

public ReverseComparator(java.util.Comparator base)

Construct a comparator that generates reverse of another comparator

Parameters:

base - the ordering to be reversed

Postcondition:

constructs a Comparator that orders in reverse order of base

Method Detail

compare

public int compare(java.lang.Object a,
                   java.lang.Object b)

Compare two values, a and b. Simply calls the default compareTo method for a on b.

Specified by:

compare in interface java.util.Comparator

Parameters:

a - object performing the compare

b - the object being compared

Returns:

value <, ==, > 0 if a <, ==, > b using a.compareTo

Precondition:

a, b non-null, and b is of type of a

Postcondition:

returns value <, ==, > 0 if a <, ==, > b

equals

public boolean equals(java.lang.Object b)

Returns true if the other object is a NaturalComparator.

Specified by:

equals in interface java.util.Comparator

Overrides:

equals in class java.lang.Object

Parameters:

b - a possible NaturalComparator

Returns:

true if b is a NaturalComparator

Postcondition:

returns true if b is a NaturalComparator