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static <T, R> Publisher<R> map(Publisher<T> upstream, Function<T, R> mapper) { | |
return downstream -> upstream.subscribe(new Mapper<>(downstream, mapper)); | |
} | |
class Mapper<T, R> implements Subscriber<T> { | |
final Subscriber<? super R> downstream; | |
final Function<T, R> mapper; | |
Mapper(Subscriber<? super R> downstream, Function<T, R> mapper) { | |
this.downstream = downstream; | |
this.mapper = mapper; | |
} | |
@Override | |
public void onSubscribe(Subscription s) { | |
downstream.onSubscribe(s); | |
} | |
@Override | |
public void onNext(T item) { | |
downstream.onNext(mapper.apply(item)); | |
} | |
@Override | |
public void onError(Throwable throwable) { | |
downstream.onError(throwable); | |
} | |
@Override | |
public void onComplete() { | |
downstream.onComplete(); | |
} | |
} |
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