hu.akarnokd.rxjava2.interop

Class MaybeInterop

java.lang.Object

hu.akarnokd.rxjava2.interop.MaybeInterop

public final class MaybeInterop
extends java.lang.Object

Utility methods, sources and operators supporting RxJava 2 and the Jdk 8 API interoperation.

Since:

0.1.0

Method Summary

Modifier and Type	Method and Description
static <T> io.reactivex.functions.Function<io.reactivex.Maybe<T>,java.util.Optional<T>>	element() Block until the source Maybe completes and return its possible value as Optional.
static <T> io.reactivex.Maybe<T>	fromFuture(java.util.concurrent.CompletionStage<T> cs) Returns a Maybe that emits the resulting value of the CompletionStage or its error, treating null as empty source.
static <T> io.reactivex.Maybe<T>	fromOptional(java.util.Optional<T> opt) Returns a Maybe that emits the value of the Optional or is empty if the Optional is also empty.
static <T> io.reactivex.functions.Function<io.reactivex.Maybe<T>,java.util.concurrent.CompletionStage<T>>	get() Returns a CompletionStage that signals the single value or terminal event of the given Maybe source.
static <T,R> io.reactivex.MaybeTransformer<T,R>	mapOptional(io.reactivex.functions.Function<? super T,java.util.Optional<R>> mapper) Maps the upstream value into an optional and extracts its optional value to be emitted towards the downstream if present.
static <T> io.reactivex.functions.Function<io.reactivex.Maybe<T>,java.util.stream.Stream<T>>	toStream() Returns a blocking Stream of a potentially zero or one value (or error) of the Maybe.

Methods inherited from class java.lang.Object

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

Method Detail

fromOptional

public static <T> io.reactivex.Maybe<T> fromOptional(java.util.Optional<T> opt)

Returns a Maybe that emits the value of the Optional or is empty if the Optional is also empty.

Type Parameters:

T - the value type

Parameters:

opt - the Optional value

Returns:

the new Maybe instance

fromFuture

public static <T> io.reactivex.Maybe<T> fromFuture(java.util.concurrent.CompletionStage<T> cs)

Returns a Maybe that emits the resulting value of the CompletionStage or its error, treating null as empty source.

Type Parameters:

T - the value type

Parameters:

cs - the source CompletionStage instance

Returns:

the new Maybe instance

get

public static <T> io.reactivex.functions.Function<io.reactivex.Maybe<T>,java.util.concurrent.CompletionStage<T>> get()

Returns a CompletionStage that signals the single value or terminal event of the given Maybe source.

An empty Maybe will complete with a null value

Type Parameters:

T - the value type

Returns:

the Function to be used with Maybe.to()

toStream

public static <T> io.reactivex.functions.Function<io.reactivex.Maybe<T>,java.util.stream.Stream<T>> toStream()

Returns a blocking Stream of a potentially zero or one value (or error) of the Maybe.

Type Parameters:

T - the value type

Returns:

the Function to be used with Maybe.to()

element

public static <T> io.reactivex.functions.Function<io.reactivex.Maybe<T>,java.util.Optional<T>> element()

Block until the source Maybe completes and return its possible value as Optional.

Type Parameters:

T - the value type

Returns:

the converter Function to be used with Maybe.to().

mapOptional

public static <T,R> io.reactivex.MaybeTransformer<T,R> mapOptional(io.reactivex.functions.Function<? super T,java.util.Optional<R>> mapper)

Maps the upstream value into an optional and extracts its optional value to be emitted towards the downstream if present.

Type Parameters:

T - the upstream value type

R - the result value type

Parameters:

mapper - the function receiving the upstream value and should return an Optional

Returns:

the Transformer instance to be used with Flowable.compose()