JarCastingRxEither 
Either is a value of one of two possible types.
Inspired by Jeffrey van Gogh's discussion with the Rx.Net users, RxEither is a port of Scala's Either for the RxJava world.
Usage
-
Progress reporting
public class ProgressExample { public static void main(String[] args) { PublishSubject<Integer> progress = PublishSubject.create(); Observable<String> results = Observable.fromCallable(() -> { progress.onNext(0); TimeUnit.SECONDS.sleep(1); progress.onNext(100); return "Hello, world!"; }).subscribeOn(Schedulers.io()); Observable<Either<Integer, String>> either = RxEither.from(progress, results).share(); RxEither.filterLeft(either).subscribe(System.out::println); RxEither.filterRight(either).toBlocking().subscribe(System.out::println); } }
Prints:
0 100 Hello, world! -
Switch
public class SwitchActionExample { public static void main(String[] args) { System.out.println("Type Either a string or an Int: "); String in = ""; Either<String, Integer> either; try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) { in = reader.readLine(); either = Either.right(Integer.parseInt(in)); } catch (NumberFormatException | IOException e) { either = Either.left(in); } either.fold( s -> { System.out.println("You passed me the String: " + s); }, x -> { System.out.println( "You passed me the Int: " + x + ", which I will increment. " + x + " + 1 = " + (x + 1)); }); } }
Prints:
Type Either a string or an Int: 1 You passed me the Int: 1, which I will increment. 1 + 1 = 2
Download
Maven:
<dependency>
<groupId>net.jokubasdargis.rxeither</groupId>
<artifactId>rxeither</artifactId>
<version>1.2.0</version>
</dependency>
Gradle:
compile 'net.jokubasdargis.rxeither:rxeither:1.2.0'
Snapshots of the development version are available in Sonatype's snapshots repository.
License
Copyright 2016 Jokubas Dargis
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.