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3.x: [Java 8] Add operators supporting the newer platform [tracking issue] #6776

Description

@akarnokd

This issue tracks the new, Java 8-related operators to be implemented.

  • Flowable.fromOptional
  • Flowable.fromStream
  • Flowable.fromCompletionStage
  • Flowable.mapOptional
  • Flowable.collect(Collector)
  • Flowable.firstStage
  • Flowable.singleStage
  • Flowable.lastStage
  • Flowable.firstOrErrorStage
  • Flowable.singleOrErrorStage
  • Flowable.lastOrErrorStage
  • Flowable.blockingStream + 1
  • Flowable.flatMapStream + 1
  • Flowable.concatMapStream + 1

  • Observable.fromOptional
  • Observable.fromStream
  • Observable.fromCompletionStage
  • Observable.mapOptional
  • Observable.collect(Collector)
  • Observable.firstStage
  • Observable.singleStage
  • Observable.lastStage
  • Observable.firstOrErrorStage
  • Observable.singleOrErrorStage
  • Observable.lastOrErrorStage
  • Observable.blockingStream + 1
  • Observable.flatMapStream
  • Observable.concatMapStream

  • Maybe.fromOptional
  • Maybe.fromCompletionStage
  • Maybe.mapOptional
  • Maybe.toCompletionStage() + 1
  • Maybe.flattenStreamAsFlowable
  • Maybe.flattenStreamAsObservable

  • Single.fromCompletionStage
  • Single.mapOptional returns Maybe<T>
  • Single.toCompletionStage()
  • Single.flattenStreamAsFlowable
  • Single.flattenStreamAsObservable

  • Completable.fromCompletionStage
  • Completable.toCompletionStage

  • ParallelFlowable.mapOptional
  • ParallelFlowable.flatMapStream
  • ParallelFlowable.collect(Collector) returns Flowable

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