local.tomas.util.comparator
Class NullComparator<X>

java.lang.Object
  local.tomas.util.comparator.NullComparator<X>

Type Parameters:

X - type of comparables

All Implemented Interfaces:

Comparator<X>

public class NullComparator<X>
extends Object
implements Comparator<X>

Comparator allowing nulls as operands.

Author:

tomas.teubner

Field Summary

protected Comparator<X>	baseComparator The base comparator.
protected boolean	nullsAreHigh true if nulls are higher than non-nulls.

Constructor Summary

NullComparator(boolean nullsAreHigh, Comparator<X> baseComparator)
Constructor.

NullComparator(Comparator<X> baseComparator)
Constructor.

Method Summary

int	compare(X o1, X o2)

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

Field Detail

nullsAreHigh

protected final boolean nullsAreHigh

true if nulls are higher than non-nulls.

baseComparator

protected final Comparator<X> baseComparator

The base comparator.

Constructor Detail

NullComparator

public NullComparator(boolean nullsAreHigh,
                      Comparator<X> baseComparator)

Constructor.

Parameters:

nullsAreHigh - true if nulls are higher than non-nulls.

baseComparator - base comparator

NullComparator

public NullComparator(Comparator<X> baseComparator)

Constructor. Nulls are lower than non-nulls.

Parameters:

baseComparator - base comparator.

Method Detail

compare

public int compare(X o1,
                   X o2)

Specified by:

compare in interface Comparator<X>