org.databene.commons
Class NullSafeComparator<E>

java.lang.Object
  org.databene.commons.NullSafeComparator<E>

All Implemented Interfaces:

java.util.Comparator<E>

public class NullSafeComparator<E>
extends java.lang.Object
implements java.util.Comparator<E>

Comparator Decorator that adds support for null-Value comparison. null may be defined to have a value either greater or less than any non-null value. Created: 11.04.2005 08:34:02

Field Summary

static int	NULL_IS_GREATER
static int	NULL_IS_LESSER

Constructor Summary

NullSafeComparator()

NullSafeComparator(java.util.Comparator<? super E> realComparator)

NullSafeComparator(java.util.Comparator<? super E> realComparator, int nullComparation)

NullSafeComparator(int nullComparation)

Method Summary

int	compare(E o1, E o2)
static <T extends java.lang.Comparable<T>> int	compare(T o1, T o2, int nullComparation)
static boolean	equals(java.lang.Object o1, java.lang.Object o2)
static int	hashCode(java.lang.Object o)

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

NULL_IS_LESSER

public static final int NULL_IS_LESSER

See Also:

Constant Field Values

NULL_IS_GREATER

public static final int NULL_IS_GREATER

See Also:

Constant Field Values

Constructor Detail

NullSafeComparator

public NullSafeComparator()

NullSafeComparator

public NullSafeComparator(int nullComparation)

NullSafeComparator

public NullSafeComparator(java.util.Comparator<? super E> realComparator)

NullSafeComparator

public NullSafeComparator(java.util.Comparator<? super E> realComparator,
                          int nullComparation)

Method Detail

compare

public int compare(E o1,
                   E o2)

Specified by:

compare in interface java.util.Comparator<E>

compare

public static <T extends java.lang.Comparable<T>> int compare(T o1,
                                                              T o2,
                                                              int nullComparation)

equals

public static boolean equals(java.lang.Object o1,
                             java.lang.Object o2)

hashCode

public static int hashCode(java.lang.Object o)