3.x: [Java 8] Implement mapOptional, collector, first/last/single stage #6775
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This PR implements the following
Flowable
operators:mapOptional
- essentially a map-filter viaOptional
s.collect(Collector)
- use the Java 8Collector
API, seeCollectors
.firstStage
- return the first item or a default value as aCompletionStage
.firstOrErrorStage
- return the first item or error as aCompletionStage
.singleStage
- return the only item or a default value as aCompletionStage
.singleOrErrorStage
- return the only item or error as aCompletionStage
.lastStage
- return the last item or a default value as aCompletionStage
.lastOrErrorStage
- return the last item or error as aCompletionStage
.Related: #6776
Diagrams: