net.sf.adatagenerator.util
Class DefaultNullComparator

java.lang.Object
  net.sf.adatagenerator.util.DefaultNullComparator

Type Parameters:

V - A class that implements Comparable

All Implemented Interfaces:

Comparator

public class DefaultNullComparator
extends Object
implements Comparator

Compares two Comparable objects.

This is a fly-weight class with no instance data.

Author:

rphall

Constructor Summary

DefaultNullComparator()

Method Summary

int	compare(Object o1, Object o2) Compares two objects.
static int	compareComparables(Object o1, Object o2) A static comparison method that compares two comparable objects and deals with null values.
static Comparator<?>	getComparator()

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

equals

Constructor Detail

DefaultNullComparator

public DefaultNullComparator()

Method Detail

getComparator

public static Comparator<?> getComparator()

compare

public int compare(Object o1,
                   Object o2)
            throws ClassCastException

Compares two objects.

Specified by:

compare in interface Comparator

Throws:

ClassCastException

See Also:

#compareComparables(Comparable, Comparable)

compareComparables

public static int compareComparables(Object o1,
                                     Object o2)

A static comparison method that compares two comparable objects and deals with null values. This method won't bind to generics.

• If is neither null, casts them to the Comparable interface, and invokes the compareTo method on the first object with the second object as an argument
• If both are null, returns 0
• If the first is null, but not the second, returns -1
• If the second is null, but not the first, returns +1

Type Parameters:

G - a comparable type

Throws:

ClassCastException - if the objects aren't comparable