org.eclipse.xtext.xbase.lib.internal

Class KeyComparator<T,C extends java.lang.Comparable<? super C>>

java.lang.Object

org.eclipse.xtext.xbase.lib.internal.KeyComparator<T,C>

Type Parameters:

T - the type to compare

C - the type of the comparable key

All Implemented Interfaces:

java.util.Comparator<T>

@GwtCompatible
public final class KeyComparator<T,C extends java.lang.Comparable<? super C>>
extends java.lang.Object
implements java.util.Comparator<T>

A comparator that compares objects by calling the supplied key function on them and then comparing the resulting keys. It is null-safe if the key's compareTo method is null-safe.

Constructor Summary

Constructors

Constructor and Description
KeyComparator(Functions.Function1<? super T,C> keyFunction)

Method Summary

Modifier and Type	Method and Description
int	compare(T a, T b)

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

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

KeyComparator

public KeyComparator(Functions.Function1<? super T,C> keyFunction)

Parameters:

keyFunction - the key function to use for comparing objects. May not be null

Method Detail

compare

public int compare(T a,
                   T b)

Specified by:

compare in interface java.util.Comparator<T>