org.apache.hudi.common.util

Class Option<T>

java.lang.Object

org.apache.hudi.common.util.Option<T>

All Implemented Interfaces:

Serializable

public final class Option<T>
extends Object
implements Serializable

Provides functionality same as java.util.Optional but is also made Serializable. Additional APIs are provided to convert to/from java.util.Optional

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
static <T> Option<T>	empty()
boolean	equals(Object o)
<U> Option<U>	flatMap(Function<? super T,Option<U>> mapper)
static <T> Option<T>	fromJavaOptional(Optional<T> v) Convert from java.util.Optional.
T	get()
int	hashCode()
void	ifPresent(Consumer<? super T> consumer)
boolean	isEmpty()
boolean	isPresent()
<U> Option<U>	map(Function<? super T,? extends U> mapper)
static <T> Option<T>	of(T value)
static <T> Option<T>	ofNullable(T value)
Option<T>	or(Option<T> other) Returns this Option if not empty, otherwise returns an alternative
Option<T>	or(Supplier<? extends Option<T>> other) Returns this Option if not empty, otherwise evaluates provided supplier and returns its result
T	orElse(T other) Identical to Optional.orElse
T	orElseGet(Supplier<? extends T> other) Identical to Optional.orElseGet
<X extends Throwable> T	orElseThrow(Supplier<? extends X> exceptionSupplier) Identical to Optional.orElseThrow
Optional<T>	toJavaOptional() Convert to java Optional.
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

toJavaOptional

public Optional<T> toJavaOptional()

Convert to java Optional.

fromJavaOptional

public static <T> Option<T> fromJavaOptional(Optional<T> v)

Convert from java.util.Optional.

Type Parameters:

T - type of the value stored in java.util.Optional object

Parameters:

v - java.util.Optional object

Returns:

Option

empty

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

of

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

ofNullable

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

isPresent

public boolean isPresent()

isEmpty

public boolean isEmpty()

get

public T get()

ifPresent

public void ifPresent(Consumer<? super T> consumer)

map

public <U> Option<U> map(Function<? super T,? extends U> mapper)

flatMap

public <U> Option<U> flatMap(Function<? super T,Option<U>> mapper)

or

public Option<T> or(Option<T> other)

Returns this Option if not empty, otherwise returns an alternative

or

public Option<T> or(Supplier<? extends Option<T>> other)

Returns this Option if not empty, otherwise evaluates provided supplier and returns its result

orElse

public T orElse(T other)

Identical to Optional.orElse

orElseGet

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

Identical to Optional.orElseGet

orElseThrow

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

Identical to Optional.orElseThrow

Throws:

X extends Throwable

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