de.caff.generics

Interface TwoWayChoiceN<T>

Type Parameters:

T - value type

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface TwoWayChoiceN<T>

A choice between two values which may be null. One value is associated with true, the other with false. This is basically the functional equivalent of the ternary operator.

The recommended way to create a two-way choice is of(Object, Object).

Since:

December 27, 2022

Author:

Rammi

Method Summary

Modifier and Type	Method and Description
default <R> TwoWayChoiceN<R>	andThen(java.util.function.Function<? super T,? extends R> mapper) Convert this into a two-way choice with a different return value.
T	choose(boolean select) Return the selected choice.
static <V> TwoWayChoiceN<V>	of(V trueValue, V falseValue) Create a two-way choice.

Method Detail

choose

@Nullable
T choose(boolean select)

Return the selected choice.

Parameters:

select - selector

Returns:

selected choice

andThen

@NotNull
default <R> TwoWayChoiceN<R> andThen(@NotNull
                                              java.util.function.Function<? super T,? extends R> mapper)

Convert this into a two-way choice with a different return value.

Type Parameters:

R - return type of returned adapted choice

Parameters:

mapper - mapper which maps the return value of this choice into the required one

Returns:

boolean choice with adapted return values

of

@NotNull
static <V> TwoWayChoiceN<V> of(@Nullable
                                        V trueValue,
                                        @Nullable
                                        V falseValue)

Create a two-way choice.

Type Parameters:

V - value type of selection

Parameters:

trueValue - value returned for true selector

falseValue - value returned for false selector

Returns:

boolean choice which performs the same as select ? trueValue : falseValue