de.tobiasroeser.lambdatest

Class Optional<T>

java.lang.Object

de.tobiasroeser.lambdatest.Optional<T>

Type Parameters:

T - The type of the optional value.

All Implemented Interfaces:

Serializable, Iterable<T>

public class Optional<T>
extends Object
implements Iterable<T>, Serializable

Value class representing an optional value.

This class is immutable and thus thread-safe.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
Optional<?>	adapt()
boolean	equals(Object obj)
<R> Optional<R>	flatMap(F1<? super T,Optional<? extends R>> f)
T	get()
T	getOrElse(T t)
T	getOrElseF(F0<T> f)
int	hashCode()
boolean	isDefined()
boolean	isEmpty()
Iterator<T>	iterator()
static <S> Optional<S>	lift(S someOrNull) Create an Optional from the given object or a none in case the object was null.
<R> Optional<R>	map(F1<? super T,? extends R> f)
static <N> Optional<N>	none()
T	orNull()
static <S> Optional<S>	some(S some) Create a defined Optional with the given value some.
List<T>	toList()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Method Detail

some

public static <S> Optional<S> some(S some)

Create a defined Optional with the given value some.

lift

public static <S> Optional<S> lift(S someOrNull)

Create an Optional from the given object or a none in case the object was null.

none

public static <N> Optional<N> none()

get

public T get()

getOrElse

public T getOrElse(T t)

getOrElseF

public T getOrElseF(F0<T> f)

orNull

public T orNull()

isDefined

public boolean isDefined()

isEmpty

public boolean isEmpty()

adapt

public Optional<?> adapt()

toList

public List<T> toList()

iterator

public Iterator<T> iterator()

Specified by:

iterator in interface Iterable<T>

map

public <R> Optional<R> map(F1<? super T,? extends R> f)

flatMap

public <R> Optional<R> flatMap(F1<? super T,Optional<? extends R>> f)

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object