Package no.digipost.util

Interface ViewableAsOptional<V>

All Known Subinterfaces:

Assignment<V>, AtMostOne<T>, ViewableAsOptional.Single<V>

All Known Implementing Classes:

ChainableAssignment, OneTimeAssignment

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 ViewableAsOptional<V>

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	ViewableAsOptional.Single<V>	A Supplier which is also ViewableAsOptional.
static class	ViewableAsOptional.TooManyElements	An object which was attempted to be viewed as a Optional representation of itself contained more than one element, and is thus not applicable for such conversion.

Method Summary

Modifier and Type	Method	Description
Optional<V>	toOptional()	Get an Optional representation of this object.

Method Details

toOptional

Optional<V> toOptional()
                throws ViewableAsOptional.TooManyElements

Get an Optional representation of this object. If it contains more elements than one, and thus cannot be viewed as an Optional without loosing any information, a ViewableAsOptional.TooManyElements is thrown.

Returns:

the Optional representation of this object.

Throws:

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