Package org.forgerock.util

Class Pair<F,S>

java.lang.Object

org.forgerock.util.Pair<F,S>

Type Parameters:

F - type of the first pair element

S - type of the second pair element

public final class Pair<F,S>
extends Object

Ordered pair of arbitrary objects. Use of Pair is strictly restricted to internal (non-public) APIs:
- Pair cannot be used in public APIs - Consider using dedicated classes over Pair. Dedicated classes are more readable while Pair is meaningless.
- Pair should only be used to return two values from a method, just like a tuple. If you need more than two values, create a dedicated class.

Field Summary

Fields

Modifier and Type	Field	Description
static Comparator	COMPARATOR	Comparator for Pairs made of Comparable elements.
static Pair<?,?>	EMPTY	An empty Pair.

Method Summary

Modifier and Type	Method	Description
Map<F,S>	asMap()	Get the pair as a map of key to value.
static <F,S> Pair<F,S>	empty()	Returns an empty Pair matching the required types.
boolean	equals(Object obj)
F	getFirst()	Returns the first element of this pair.
static <F extends Comparable<F>,S extends Comparable<S>> Comparator<Pair<F,S>>	getPairComparator()	Returns a comparator for Pairs of comparable objects.
S	getSecond()	Returns the second element of this pair.
int	hashCode()
static <F,S> Pair<F,S>	of(F first, S second)	Creates a new Pair.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

EMPTY

public static final Pair<?,?> EMPTY

An empty Pair.

COMPARATOR

public static final Comparator COMPARATOR

Comparator for Pairs made of Comparable elements.

Method Detail

of

public static <F,S> Pair<F,S> of(F first,
                                             S second)

Creates a new Pair.

Type Parameters:

F - type of the first pair element

S - type of the second pair element

Parameters:

first - the first element of the constructed pair

second - the second element of the constructed pair

Returns:

A new Pair built with the provided elements

empty

public static <F,S> Pair<F,S> empty()

Returns an empty Pair matching the required types.

Type Parameters:

F - type of the first pair element

S - type of the second pair element

Returns:

An empty Pair matching the required types

getPairComparator

public static <F extends Comparable<F>,S extends Comparable<S>> Comparator<Pair<F,S>> getPairComparator()

Returns a comparator for Pairs of comparable objects.

Type Parameters:

F - type of the first pair element

S - type of the second pair element

Returns:

a comparator for Pairs of comparable objects.

getFirst

public F getFirst()

Returns the first element of this pair.

Returns:

the first element of this pair

getSecond

public S getSecond()

Returns the second element of this pair.

Returns:

the second element of this pair

asMap

public Map<F,S> asMap()

Get the pair as a map of key to value.

Returns:

The map.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object