com.atlassian.jira.util

Class Optionals

java.lang.Object

com.atlassian.jira.util.Optionals

public final class Optionals
extends Object

Utility methods relating to the Optional type, to make up for its deficiencies.

Since:

9.7

Method Summary

Modifier and Type	Method and Description
static <T> Optional<T>	fallBack(Optional<T> primary, java.util.function.Supplier<Optional<T>> secondarySupplier) If the first optional given is empty, falls back to the second one (which could also be empty).
static <T> void	foldToEffect(Optional<T> optional, java.util.function.Consumer<T> ifPresent, Runnable ifAbsent) Specialised version of fold that "returns" Void.

Methods inherited from class java.lang.Object

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

Method Detail

fallBack

@Nonnull
public static <T> Optional<T> fallBack(Optional<T> primary,
                                                java.util.function.Supplier<Optional<T>> secondarySupplier)

If the first optional given is empty, falls back to the second one (which could also be empty).

Type Parameters:

T - the type of optional value

Parameters:

primary - the first optional to check

secondarySupplier - the supplier of the optional to use as a fallback

Returns:

an optional, could be empty

foldToEffect

public static <T> void foldToEffect(Optional<T> optional,
                                    java.util.function.Consumer<T> ifPresent,
                                    Runnable ifAbsent)

Specialised version of fold that "returns" Void.

Type Parameters:

T - the optional type

Parameters:

optional - the optional to be folded

ifPresent - the consumer to invoke if the optional is present

ifAbsent - the effect to perform if the optional is empty