FlowableInterop (rxjava2-jdk8-interop 0.2.12 API)

java.lang.Object
- hu.akarnokd.rxjava2.interop.FlowableInterop

```
public final class FlowableInterop
extends java.lang.Object
```
Utility methods, sources and operators supporting RxJava 2 and the Jdk 8 API interoperation.

Since:

0.1.0

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <T,A,R> io.reactivex.FlowableTransformer<T,R>`	`collect(java.util.stream.Collector<T,A,R> collector)` Collect the elements of the Flowable via the help of Collector and its callback functions.
`static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.concurrent.CompletionStage<T>>`	`first()` Returns a CompletionStage that signals the first element of the Flowable or a NoSuchElementException if the Flowable is empty.
`static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.Optional<T>>`	`firstElement()` Block until the source Flowable emits its first item and return that as Optional.
`static <T,R> io.reactivex.FlowableTransformer<T,R>`	`flatMapStream(io.reactivex.functions.Function<? super T,? extends java.util.stream.Stream<R>> mapper)` Map each value of the upstream into a Stream and flatten them into a single sequence.
`static <T> io.reactivex.Flowable<T>`	`fromFuture(java.util.concurrent.CompletionStage<T> cs)` Create a Flowable that signals the terminal value or error of the given CompletionStage.
`static <T> io.reactivex.Flowable<T>`	`fromOptional(java.util.Optional<T> opt)` Returns a Flowable for the value (or lack of) in the given Optional.
`static <T> io.reactivex.Flowable<T>`	`fromStream(java.util.stream.Stream<T> stream)` Wrap a Stream into a Flowable.
`static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.concurrent.CompletionStage<T>>`	`last()` Returns a CompletionStage that emits the last element of the Flowable or NoSuchElementException if the Flowable is empty.
`static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.Optional<T>>`	`lastElement()` Block until the source Flowable completes and return its last value as Optional.
`static <T,R> io.reactivex.FlowableTransformer<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.Flowable<T>,java.util.concurrent.CompletionStage<T>>`	`single()` Returns a CompletionStage that signals the single element of the Flowable, IllegalArgumentException if the Flowable is longer than 1 element or a NoSuchElementException if the Flowable is empty.
`static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.stream.Stream<T>>`	`toStream()` Returns a blocking Stream of the elements of the Flowable.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - fromStream
```
public static <T> io.reactivex.Flowable<T> fromStream(java.util.stream.Stream<T> stream)
```
    Wrap a Stream into a Flowable.
    Note that Streams can only be consumed once and non-concurrently.
    
    Type Parameters:
    
    T - the value type
    
    Parameters:
    
    stream - the source Stream
    
    Returns:
    
    the new Flowable instance
  - fromOptional
```
public static <T> io.reactivex.Flowable<T> fromOptional(java.util.Optional<T> opt)
```
    Returns a Flowable for the value (or lack of) in the given Optional.
    
    Type Parameters:
    
    T - the value type
    
    Parameters:
    
    opt - the optional to wrap
    
    Returns:
    
    the new Flowable instance
  - fromFuture
```
public static <T> io.reactivex.Flowable<T> fromFuture(java.util.concurrent.CompletionStage<T> cs)
```
    Create a Flowable that signals the terminal value or error of the given CompletionStage.
    Cancelling the Flowable subscription doesn't cancel the CompletionStage.
    
    Type Parameters:
    
    T - the value type
    
    Parameters:
    
    cs - the CompletionStage instance
    
    Returns:
    
    the new Flowable instance
  - collect
```
public static <T,A,R> io.reactivex.FlowableTransformer<T,R> collect(java.util.stream.Collector<T,A,R> collector)
```
    Collect the elements of the Flowable via the help of Collector and its callback functions.
    
    Type Parameters:
    
    T - the upstream value type
    
    A - the accumulated type
    
    R - the result type
    
    Parameters:
    
    collector - the Collector object providing the callbacks
    
    Returns:
    
    the Transformer instance to be used with Flowable.compose()
  - first
```
public static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.concurrent.CompletionStage<T>> first()
```
    Returns a CompletionStage that signals the first element of the Flowable or a NoSuchElementException if the Flowable is empty.
    
    Type Parameters:
    
    T - the value type
    
    Returns:
    
    the Function to be used via Flowable.to.
  - single
```
public static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.concurrent.CompletionStage<T>> single()
```
    Returns a CompletionStage that signals the single element of the Flowable, IllegalArgumentException if the Flowable is longer than 1 element or a NoSuchElementException if the Flowable is empty.
    
    Type Parameters:
    
    T - the value type
    
    Returns:
    
    the Function to be used with Flowable.to.
  - last
```
public static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.concurrent.CompletionStage<T>> last()
```
    Returns a CompletionStage that emits the last element of the Flowable or NoSuchElementException if the Flowable is empty.
    
    Type Parameters:
    
    T - the value type
    
    Returns:
    
    the Function to be used with Flowable.to.
  - toStream
```
public static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.stream.Stream<T>> toStream()
```
    Returns a blocking Stream of the elements of the Flowable.
    Closing the Stream will cancel the flow.
    
    Type Parameters:
    
    T - the value type
    
    Returns:
    
    the Function to be used with Flowable.to.
  - firstElement
```
public static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.Optional<T>> firstElement()
```
    Block until the source Flowable emits its first item and return that as Optional.
    
    Type Parameters:
    
    T - the value type
    
    Returns:
    
    the converter Function to be used with Flowable.to().
  - lastElement
```
public static <T> io.reactivex.functions.Function<io.reactivex.Flowable<T>,java.util.Optional<T>> lastElement()
```
    Block until the source Flowable completes and return its last value as Optional.
    
    Type Parameters:
    
    T - the value type
    
    Returns:
    
    the converter Function to be used with Flowable.to().
  - flatMapStream
```
public static <T,R> io.reactivex.FlowableTransformer<T,R> flatMapStream(io.reactivex.functions.Function<? super T,? extends java.util.stream.Stream<R>> mapper)
```
    Map each value of the upstream into a Stream and flatten them into a single sequence.
    
    Type Parameters:
    
    T - the input value type
    
    R - the Stream type
    
    Parameters:
    
    mapper - the function that returns a Stream for each upstream value
    
    Returns:
    
    the Transformer instance to be used with Flowable.compose()
  - mapOptional
```
public static <T,R> io.reactivex.FlowableTransformer<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()

Class FlowableInterop

Method Summary

Methods inherited from class java.lang.Object

Method Detail

fromStream

fromOptional

fromFuture

collect

first

single

last

toStream

firstElement

lastElement

flatMapStream

mapOptional