Package no.digipost.util

Interface ViewableAsOptional.Single<V>

Type Parameters:

V - The type of the supplied value

All Superinterfaces:

Supplier<V>, ViewableAsOptional<V>

All Known Subinterfaces:

Assignment<V>

All Known Implementing Classes:

ChainableAssignment, OneTimeAssignment

Enclosing interface:

ViewableAsOptional<V>

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 static interface ViewableAsOptional.Single<V>
extends Supplier<V>, ViewableAsOptional<V>

A Supplier which is also ViewableAsOptional.

Nested Class Summary

Nested classes/interfaces inherited from interface no.digipost.util.ViewableAsOptional

ViewableAsOptional.Single<V>, ViewableAsOptional.TooManyElements

Method Summary

Modifier and Type	Method	Description
default Optional<V>	toOptional()	Convert this object to an Optional by wrapping the value returned from Supplier.get().

Methods inherited from interface java.util.function.Supplier

get

Method Details

toOptional

default Optional<V> toOptional()
                        throws ViewableAsOptional.TooManyElements

Convert this object to an Optional by wrapping the value returned from Supplier.get().

Specified by:

toOptional in interface ViewableAsOptional<V>

Returns:

the value returned from Supplier.get(), wrapped in an Optional. If get() returns null, Optional.empty() is returned.

Throws:

ViewableAsOptional.TooManyElements - if this object contains more than one element, and thus is not applicable for lossless conversion to an Optional.