Package eu.simuline.util

Class Comparators<E>

java.lang.Object

eu.simuline.util.Comparators<E>

Type Parameters:

E - the type to be compared. Created: Sat May 21 16:30:58 2005

public abstract class Comparators<E>
extends Object

Collection of static methods related with Comparators.

Version:

1.0

Author:

Ernst Reissner

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	Comparators.AsListed<E>	Implements an ordering given by the list Comparators.AsListed.seq.
private static class	Comparators.Cascade<E>	Represents a comparator which is a cascade of comparators: Starting with the first comparator in Comparators.Cascade.seq asks the next comparator if the current one detects equality.

Constructor Summary

Constructors

Constructor	Description
Comparators()

Method Summary

Modifier and Type	Method	Description
static <E> Comparator<E>	getAsListed(List<E> seq)	Returns an ordering given by the list Comparators.AsListed.seq.
static <E> Comparator<E>	getCascade(Collection<Comparator<E>> seq)
static <E> Comparator<E>	getInv(Comparator<E> cmp)
static <E> Comparator<E>	getNegative(Comparator<E> cmp)

Methods inherited from class java.lang.Object

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

Constructor Detail

Comparators

public Comparators()

Method Detail

getNegative

public static <E> Comparator<E> getNegative(Comparator<E> cmp)

getInv

public static <E> Comparator<E> getInv(Comparator<E> cmp)

getCascade

public static <E> Comparator<E> getCascade(Collection<Comparator<E>> seq)

getAsListed

public static <E> Comparator<E> getAsListed(List<E> seq)

Returns an ordering given by the list Comparators.AsListed.seq. Elements not in the list are all minimal and pairwise equal with respect to this comparator. They are less than all elements in the list. The ordering on the list is ascending.

CAUTION: This ordering is consistent with equals only under certain conditions. The other ordering axioms hold. For more details see Comparators.AsListed.

Caution: changing the list, affects the comparator.

Parameters:

seq - a list which determines the ordering.

Throws:

NullPointerException - if seq is null.