Package com.github.underscore

Class Optional<T>

java.lang.Object

com.github.underscore.Optional<T>

public final class Optional<T>
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	absent
private T	arg
private static Optional<?>	EMPTY

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Optional()
private	Optional(T arg)

Method Summary

Modifier and Type	Method	Description
static <T> Optional<T>	empty()
boolean	equals(Object o)
Optional<T>	filter(Predicate<? super T> predicate)
static <T> Optional<T>	fromNullable(T nullableReference)
T	get()
int	hashCode()
boolean	isEmpty()
boolean	isPresent()
<F> Optional<F>	map(Function<? super T,F> mapper)
static <T> Optional<T>	of(T arg)
T	or(T defaultValue)
T	orNull()
<X extends Throwable> T	orThrow(Supplier<? extends X> exceptionFunction)
Optional<T>	toJavaOptional()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY

private static final Optional<?> EMPTY

arg

private final T arg

absent

private final boolean absent

Constructor Detail

Optional

private Optional()

Optional

private Optional(T arg)

Method Detail

of

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

fromNullable

public static <T> Optional<T> fromNullable(T nullableReference)

empty

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

get

public T get()

or

public T or(T defaultValue)

orNull

public T orNull()

isEmpty

public boolean isEmpty()

isPresent

public boolean isPresent()

filter

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

map

public <F> Optional<F> map(Function<? super T,F> mapper)

orThrow

public <X extends Throwable> T orThrow(Supplier<? extends X> exceptionFunction)
                                throws X extends Throwable

Throws:

X extends Throwable

toJavaOptional

public Optional<T> toJavaOptional()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object