Package org.dmfs.jems2.single

Class Backed<T>

java.lang.Object

org.dmfs.jems2.single.Backed<T>

All Implemented Interfaces:

Fragile<T,RuntimeException>, Optional<T>, Single<T>

public final class Backed<T>
extends Object
implements Single<T>, Optional<T>

Single and Optional that delegates to the given Optional if that is present, otherwise falls back to the provided back-up Single.

Constructor Summary

Constructors

Constructor	Description
Backed(Optional<? extends T> optional, Fragile<? extends T,? extends RuntimeException> backUp)
Backed(Optional<? extends T> optional, T backUp)

Method Summary

Modifier and Type	Method	Description
boolean	isPresent()	Returns whether the optional value is present.
T	value()	Returns the sole value of this 1-tuple.

Methods inherited from class java.lang.Object

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

Constructor Details

Backed

public Backed(Optional<? extends T> optional,
 Fragile<? extends T,? extends RuntimeException> backUp)

Backed

public Backed(Optional<? extends T> optional,
 T backUp)

Method Details

isPresent

public boolean isPresent()

Description copied from interface: Optional

Returns whether the optional value is present.

Specified by:

isPresent in interface Optional<T>

value

public T value()

Description copied from interface: Single

Returns the sole value of this 1-tuple.

Specified by:

value in interface Fragile<T,RuntimeException>

Specified by:

value in interface Optional<T>

Specified by:

value in interface Single<T>