Package org.anchoranalysis.core.functional

Class OptionalComparator

Object

OptionalComparator

public class OptionalComparator
extends Object

Creates a Comparator that can work with Optionals.

An Optional.empty() value can be eithered first or last.

Author:

Owen Feehan

Method Summary

Modifier and Type	Method	Description
static <T extends Comparable<T>> Comparator<Optional<T>>	emptyFirstComparator()	Creates a Comparator for elements of type T where empty-values are first.
static <T extends Comparable<T>> Comparator<Optional<T>>	emptyLastComparator()	Creates a Comparator for elements of type T where empty-values are last.

Methods inherited from class java.lang.Object

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

Method Details

emptyFirstComparator

public static <T extends Comparable<T>>
Comparator<Optional<T>> emptyFirstComparator()

Creates a Comparator for elements of type T where empty-values are first.

Inspired by this Stack Overflow post by Anderson Vieira.

Type Parameters:

T - element-type (without Optional.

Returns:

the comparator.

emptyLastComparator

public static <T extends Comparable<T>>
Comparator<Optional<T>> emptyLastComparator()

Creates a Comparator for elements of type T where empty-values are last.

Type Parameters:

T - element-type (without Optional.

Returns:

the comparator.