com.aldebaran.qi

Class Optional<T>

java.lang.Object

com.aldebaran.qi.Optional<T>

public final class Optional<T>
extends Object

For documentation purpose, please refer to https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html TODO : remove when java 1.8

Method Summary

Modifier and Type	Method and Description
static <T> Optional<T>	empty()
boolean	equals(Object obj)
Optional<T>	filter(Predicate<? super T> predicate)
<U> Optional<U>	flatMap(Function<? super T,? extends Optional<? extends U>> mapper)
T	get()
int	hashCode()
void	ifPresent(Consumer<? super T> action)
void	ifPresentOrElse(Consumer<? super T> action, Runnable emptyAction)
boolean	isPresent()
<U> Optional<U>	map(Function<? super T,? extends U> mapper)
static <T> Optional<T>	of(T value)
static <T> Optional<T>	ofNullable(T value)
Optional<T>	or(Supplier<? extends Optional<? extends T>> supplier)
T	orElse(T other)
T	orElseGet(Supplier<? extends T> supplier)
<X extends Throwable> T	orElseThrow(Supplier<? extends X> exceptionSupplier)
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

empty

public static <T> Optional<T> empty()

of

public static <T> Optional<T> of(T value)

ofNullable

public static <T> Optional<T> ofNullable(T value)

get

public T get()

isPresent

public boolean isPresent()

ifPresent

public void ifPresent(Consumer<? super T> action)
               throws Throwable

Throws:

Throwable

ifPresentOrElse

public void ifPresentOrElse(Consumer<? super T> action,
                            Runnable emptyAction)
                     throws Throwable

Throws:

Throwable

filter

public Optional<T> filter(Predicate<? super T> predicate)

map

public <U> Optional<U> map(Function<? super T,? extends U> mapper)
                    throws Throwable

Throws:

Throwable

flatMap

public <U> Optional<U> flatMap(Function<? super T,? extends Optional<? extends U>> mapper)
                        throws Throwable

Throws:

Throwable

or

public Optional<T> or(Supplier<? extends Optional<? extends T>> supplier)

orElse

public T orElse(T other)

orElseGet

public T orElseGet(Supplier<? extends T> supplier)

orElseThrow

public <X extends Throwable> T orElseThrow(Supplier<? extends X> exceptionSupplier)
                                    throws X extends Throwable

Throws:

X extends Throwable

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object