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8319123: Implement JEP 461: Stream Gatherers (Preview)

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Reviewed-by: tvaleev, alanb, psandoz
This commit is contained in:
Viktor Klang 2023-11-30 14:45:23 +00:00 • committed by Alan Bateman
parent 04ad98ed32
commit 33b26f79a9
24 changed files with 4988 additions and 7 deletions
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26
src/java.base/share/classes/java/util/stream/ReferencePipeline.java
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@ -90,12 +90,27 @@ abstract class ReferencePipeline<P_IN, P_OUT>
* Constructor for appending an intermediate operation onto an existing
* pipeline.
*
* @param upstream the upstream element source.
* @param upstream the upstream element source
* @param opFlags The operation flags for this operation, described in
* {@link StreamOpFlag}
*/
ReferencePipeline(AbstractPipeline<?, P_IN, ?> upstream, int opFlags) {
super(upstream, opFlags);
}
/**
* Constructor for appending an intermediate operation onto an existing
* pipeline.
*
* @param upupstream the upstream of the upstream element source
* @param upstream the upstream element source
* @param opFlags The operation flags for this operation, described in
* {@link StreamOpFlag}
*/
protected ReferencePipeline(AbstractPipeline<?, P_IN, ?> upupstream, AbstractPipeline<?, P_IN, ?> upstream, int opFlags) {
super(upupstream, upstream, opFlags);
}
// Shape-specific methods
@Override
@ -667,9 +682,14 @@ abstract class ReferencePipeline<P_IN, P_OUT>
return evaluate(ReduceOps.makeRef(identity, accumulator, combiner));
}
@Override
public final <R> Stream<R> gather(Gatherer<? super P_OUT, ?, R> gatherer) {
return GathererOp.of(this, gatherer);
}
@Override
@SuppressWarnings("unchecked")
public final <R, A> R collect(Collector<? super P_OUT, A, R> collector) {
public <R, A> R collect(Collector<? super P_OUT, A, R> collector) {
A container;
if (isParallel()
&& (collector.characteristics().contains(Collector.Characteristics.CONCURRENT))
@ -687,7 +707,7 @@ abstract class ReferencePipeline<P_IN, P_OUT>
}
@Override
public final <R> R collect(Supplier<R> supplier,
public <R> R collect(Supplier<R> supplier,
BiConsumer<R, ? super P_OUT> accumulator,
BiConsumer<R, R> combiner) {
return evaluate(ReduceOps.makeRef(supplier, accumulator, combiner));