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/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package java.util.stream;
import java.util.LongSummaryStatistics;
import java.util.Objects;
import java.util.OptionalDouble;
import java.util.OptionalLong;
import java.util.PrimitiveIterator;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.IntFunction;
import java.util.function.LongBinaryOperator;
import java.util.function.LongConsumer;
import java.util.function.LongFunction;
import java.util.function.LongPredicate;
import java.util.function.LongToDoubleFunction;
import java.util.function.LongToIntFunction;
import java.util.function.LongUnaryOperator;
import java.util.function.ObjLongConsumer;
import java.util.function.Supplier;
/**
* Abstract base class for an intermediate pipeline stage or pipeline source
* stage implementing whose elements are of type {@code long}.
*
* @param <E_IN> type of elements in the upstream source
* @since 1.8
*/
abstract class LongPipeline<E_IN>
extends AbstractPipeline<E_IN, Long, LongStream>
implements LongStream {
/**
* Constructor for the head of a stream pipeline.
*
* @param source {@code Supplier<Spliterator>} describing the stream source
* @param sourceFlags the source flags for the stream source, described in
* {@link StreamOpFlag}
* @param parallel {@code true} if the pipeline is parallel
*/
LongPipeline(Supplier<? extends Spliterator<Long>> source,
int sourceFlags, boolean parallel) {
super(source, sourceFlags, parallel);
}
/**
* Constructor for the head of a stream pipeline.
*
* @param source {@code Spliterator} describing the stream source
* @param sourceFlags the source flags for the stream source, described in
* {@link StreamOpFlag}
* @param parallel {@code true} if the pipeline is parallel
*/
LongPipeline(Spliterator<Long> source,
int sourceFlags, boolean parallel) {
super(source, sourceFlags, parallel);
}
/**
* Constructor for appending an intermediate operation onto an existing pipeline.
*
* @param upstream the upstream element source.
* @param opFlags the operation flags
*/
LongPipeline(AbstractPipeline<?, E_IN, ?> upstream, int opFlags) {
super(upstream, opFlags);
}
/**
* Adapt a {@code Sink<Long> to an {@code LongConsumer}, ideally simply
* by casting.
*/
private static LongConsumer adapt(Sink<Long> sink) {
if (sink instanceof LongConsumer) {
return (LongConsumer) sink;
} else {
if (Tripwire.ENABLED)
Tripwire.trip(AbstractPipeline.class,
"using LongStream.adapt(Sink<Long> s)");
return sink::accept;
}
}
/**
* Adapt a {@code Spliterator<Long>} to a {@code Spliterator.OfLong}.
*
* @implNote
* The implementation attempts to cast to a Spliterator.OfLong, and throws
* an exception if this cast is not possible.
*/
private static Spliterator.OfLong adapt(Spliterator<Long> s) {
if (s instanceof Spliterator.OfLong) {
return (Spliterator.OfLong) s;
} else {
if (Tripwire.ENABLED)
Tripwire.trip(AbstractPipeline.class,
"using LongStream.adapt(Spliterator<Long> s)");
throw new UnsupportedOperationException("LongStream.adapt(Spliterator<Long> s)");
}
}
// Shape-specific methods
@Override
final StreamShape getOutputShape() {
return StreamShape.LONG_VALUE;
}
@Override
final <P_IN> Node<Long> evaluateToNode(PipelineHelper<Long> helper,
Spliterator<P_IN> spliterator,
boolean flattenTree,
IntFunction<Long[]> generator) {
return Nodes.collectLong(helper, spliterator, flattenTree);
}
@Override
final <P_IN> Spliterator<Long> wrap(PipelineHelper<Long> ph,
Supplier<Spliterator<P_IN>> supplier,
boolean isParallel) {
return new StreamSpliterators.LongWrappingSpliterator<>(ph, supplier, isParallel);
}
@Override
@SuppressWarnings("unchecked")
final Spliterator.OfLong lazySpliterator(Supplier<? extends Spliterator<Long>> supplier) {
return new StreamSpliterators.DelegatingSpliterator.OfLong((Supplier<Spliterator.OfLong>) supplier);
}
@Override
final void forEachWithCancel(Spliterator<Long> spliterator, Sink<Long> sink) {
Spliterator.OfLong spl = adapt(spliterator);
LongConsumer adaptedSink = adapt(sink);
do { } while (!sink.cancellationRequested() && spl.tryAdvance(adaptedSink));
}
@Override
final Node.Builder<Long> makeNodeBuilder(long exactSizeIfKnown, IntFunction<Long[]> generator) {
return Nodes.longBuilder(exactSizeIfKnown);
}
// LongStream
@Override
public final PrimitiveIterator.OfLong iterator() {
return Spliterators.iterator(spliterator());
}
@Override
public final Spliterator.OfLong spliterator() {
return adapt(super.spliterator());
}
// Stateless intermediate ops from LongStream
@Override
public final DoubleStream asDoubleStream() {
return new DoublePipeline.StatelessOp<Long>(this, StreamShape.LONG_VALUE,
StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
@Override
Sink<Long> opWrapSink(int flags, Sink<Double> sink) {
return new Sink.ChainedLong<Double>(sink) {
@Override
public void accept(long t) {
downstream.accept((double) t);
}
};
}
};
}
@Override
public final Stream<Long> boxed() {
return mapToObj(Long::valueOf);
}
@Override
public final LongStream map(LongUnaryOperator mapper) {
Objects.requireNonNull(mapper);
return new StatelessOp<Long>(this, StreamShape.LONG_VALUE,
StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
@Override
Sink<Long> opWrapSink(int flags, Sink<Long> sink) {
return new Sink.ChainedLong<Long>(sink) {
@Override
public void accept(long t) {
downstream.accept(mapper.applyAsLong(t));
}
};
}
};
}
@Override
public final <U> Stream<U> mapToObj(LongFunction<? extends U> mapper) {
Objects.requireNonNull(mapper);
return new ReferencePipeline.StatelessOp<Long, U>(this, StreamShape.LONG_VALUE,
StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
@Override
Sink<Long> opWrapSink(int flags, Sink<U> sink) {
return new Sink.ChainedLong<U>(sink) {
@Override
public void accept(long t) {
downstream.accept(mapper.apply(t));
}
};
}
};
}
@Override
public final IntStream mapToInt(LongToIntFunction mapper) {
Objects.requireNonNull(mapper);
return new IntPipeline.StatelessOp<Long>(this, StreamShape.LONG_VALUE,
StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
@Override
Sink<Long> opWrapSink(int flags, Sink<Integer> sink) {
return new Sink.ChainedLong<Integer>(sink) {
@Override
public void accept(long t) {
downstream.accept(mapper.applyAsInt(t));
}
};
}
};
}
@Override
public final DoubleStream mapToDouble(LongToDoubleFunction mapper) {
Objects.requireNonNull(mapper);
return new DoublePipeline.StatelessOp<Long>(this, StreamShape.LONG_VALUE,
StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
@Override
Sink<Long> opWrapSink(int flags, Sink<Double> sink) {
return new Sink.ChainedLong<Double>(sink) {
@Override
public void accept(long t) {
downstream.accept(mapper.applyAsDouble(t));
}
};
}
};
}
@Override
public final LongStream flatMap(LongFunction<? extends LongStream> mapper) {
return new StatelessOp<Long>(this, StreamShape.LONG_VALUE,
StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT | StreamOpFlag.NOT_SIZED) {
@Override
Sink<Long> opWrapSink(int flags, Sink<Long> sink) {
return new Sink.ChainedLong<Long>(sink) {
@Override
public void begin(long size) {
downstream.begin(-1);
}
@Override
public void accept(long t) {
try (LongStream result = mapper.apply(t)) {
// We can do better that this too; optimize for depth=0 case and just grab spliterator and forEach it
if (result != null)
result.sequential().forEach(i -> downstream.accept(i));
}
}
};
}
};
}
@Override
public LongStream unordered() {
if (!isOrdered())
return this;
return new StatelessOp<Long>(this, StreamShape.LONG_VALUE, StreamOpFlag.NOT_ORDERED) {
@Override
Sink<Long> opWrapSink(int flags, Sink<Long> sink) {
return sink;
}
};
}
@Override
public final LongStream filter(LongPredicate predicate) {
Objects.requireNonNull(predicate);
return new StatelessOp<Long>(this, StreamShape.LONG_VALUE,
StreamOpFlag.NOT_SIZED) {
@Override
Sink<Long> opWrapSink(int flags, Sink<Long> sink) {
return new Sink.ChainedLong<Long>(sink) {
@Override
public void begin(long size) {
downstream.begin(-1);
}
@Override
public void accept(long t) {
if (predicate.test(t))
downstream.accept(t);
}
};
}
};
}
@Override
public final LongStream peek(LongConsumer action) {
Objects.requireNonNull(action);
return new StatelessOp<Long>(this, StreamShape.LONG_VALUE,
0) {
@Override
Sink<Long> opWrapSink(int flags, Sink<Long> sink) {
return new Sink.ChainedLong<Long>(sink) {
@Override
public void accept(long t) {
action.accept(t);
downstream.accept(t);
}
};
}
};
}
// Stateful intermediate ops from LongStream
@Override
public final LongStream limit(long maxSize) {
if (maxSize < 0)
throw new IllegalArgumentException(Long.toString(maxSize));
return SliceOps.makeLong(this, 0, maxSize);
}
@Override
public final LongStream skip(long n) {
if (n < 0)
throw new IllegalArgumentException(Long.toString(n));
if (n == 0)
return this;
else
return SliceOps.makeLong(this, n, -1);
}
@Override
public final LongStream sorted() {
return SortedOps.makeLong(this);
}
@Override
public final LongStream distinct() {
// While functional and quick to implement, this approach is not very efficient.
// An efficient version requires a long-specific map/set implementation.
return boxed().distinct().mapToLong(i -> (long) i);
}
// Terminal ops from LongStream
@Override
public void forEach(LongConsumer action) {
evaluate(ForEachOps.makeLong(action, false));
}
@Override
public void forEachOrdered(LongConsumer action) {
evaluate(ForEachOps.makeLong(action, true));
}
@Override
public final long sum() {
// use better algorithm to compensate for intermediate overflow?
return reduce(0, Long::sum);
}
@Override
public final OptionalLong min() {
return reduce(Math::min);
}
@Override
public final OptionalLong max() {
return reduce(Math::max);
}
@Override
public final OptionalDouble average() {
long[] avg = collect(() -> new long[2],
(ll, i) -> {
ll[0]++;
ll[1] += i;
},
(ll, rr) -> {
ll[0] += rr[0];
ll[1] += rr[1];
});
return avg[0] > 0
? OptionalDouble.of((double) avg[1] / avg[0])
: OptionalDouble.empty();
}
@Override
public final long count() {
return map(e -> 1L).sum();
}
@Override
public final LongSummaryStatistics summaryStatistics() {
return collect(LongSummaryStatistics::new, LongSummaryStatistics::accept,
LongSummaryStatistics::combine);
}
@Override
public final long reduce(long identity, LongBinaryOperator op) {
return evaluate(ReduceOps.makeLong(identity, op));
}
@Override
public final OptionalLong reduce(LongBinaryOperator op) {
return evaluate(ReduceOps.makeLong(op));
}
@Override
public final <R> R collect(Supplier<R> supplier,
ObjLongConsumer<R> accumulator,
BiConsumer<R, R> combiner) {
BinaryOperator<R> operator = (left, right) -> {
combiner.accept(left, right);
return left;
};
return evaluate(ReduceOps.makeLong(supplier, accumulator, operator));
}
@Override
public final boolean anyMatch(LongPredicate predicate) {
return evaluate(MatchOps.makeLong(predicate, MatchOps.MatchKind.ANY));
}
@Override
public final boolean allMatch(LongPredicate predicate) {
return evaluate(MatchOps.makeLong(predicate, MatchOps.MatchKind.ALL));
}
@Override
public final boolean noneMatch(LongPredicate predicate) {
return evaluate(MatchOps.makeLong(predicate, MatchOps.MatchKind.NONE));
}
@Override
public final OptionalLong findFirst() {
return evaluate(FindOps.makeLong(true));
}
@Override
public final OptionalLong findAny() {
return evaluate(FindOps.makeLong(false));
}
@Override
public final long[] toArray() {
return Nodes.flattenLong((Node.OfLong) evaluateToArrayNode(Long[]::new))
.asPrimitiveArray();
}
//
/**
* Source stage of a LongPipeline.
*
* @param <E_IN> type of elements in the upstream source
* @since 1.8
*/
static class Head<E_IN> extends LongPipeline<E_IN> {
/**
* Constructor for the source stage of a LongStream.
*
* @param source {@code Supplier<Spliterator>} describing the stream
* source
* @param sourceFlags the source flags for the stream source, described
* in {@link StreamOpFlag}
* @param parallel {@code true} if the pipeline is parallel
*/
Head(Supplier<? extends Spliterator<Long>> source,
int sourceFlags, boolean parallel) {
super(source, sourceFlags, parallel);
}
/**
* Constructor for the source stage of a LongStream.
*
* @param source {@code Spliterator} describing the stream source
* @param sourceFlags the source flags for the stream source, described
* in {@link StreamOpFlag}
* @param parallel {@code true} if the pipeline is parallel
*/
Head(Spliterator<Long> source,
int sourceFlags, boolean parallel) {
super(source, sourceFlags, parallel);
}
@Override
final boolean opIsStateful() {
throw new UnsupportedOperationException();
}
@Override
final Sink<E_IN> opWrapSink(int flags, Sink<Long> sink) {
throw new UnsupportedOperationException();
}
// Optimized sequential terminal operations for the head of the pipeline
@Override
public void forEach(LongConsumer action) {
if (!isParallel()) {
adapt(sourceStageSpliterator()).forEachRemaining(action);
} else {
super.forEach(action);
}
}
@Override
public void forEachOrdered(LongConsumer action) {
if (!isParallel()) {
adapt(sourceStageSpliterator()).forEachRemaining(action);
} else {
super.forEachOrdered(action);
}
}
}
/** Base class for a stateless intermediate stage of a LongStream.
*
* @param <E_IN> type of elements in the upstream source
* @since 1.8
*/
abstract static class StatelessOp<E_IN> extends LongPipeline<E_IN> {
/**
* Construct a new LongStream by appending a stateless intermediate
* operation to an existing stream.
* @param upstream The upstream pipeline stage
* @param inputShape The stream shape for the upstream pipeline stage
* @param opFlags Operation flags for the new stage
*/
StatelessOp(AbstractPipeline<?, E_IN, ?> upstream,
StreamShape inputShape,
int opFlags) {
super(upstream, opFlags);
assert upstream.getOutputShape() == inputShape;
}
@Override
final boolean opIsStateful() {
return false;
}
}
/**
* Base class for a stateful intermediate stage of a LongStream.
*
* @param <E_IN> type of elements in the upstream source
* @since 1.8
*/
abstract static class StatefulOp<E_IN> extends LongPipeline<E_IN> {
/**
* Construct a new LongStream by appending a stateful intermediate
* operation to an existing stream.
* @param upstream The upstream pipeline stage
* @param inputShape The stream shape for the upstream pipeline stage
* @param opFlags Operation flags for the new stage
*/
StatefulOp(AbstractPipeline<?, E_IN, ?> upstream,
StreamShape inputShape,
int opFlags) {
super(upstream, opFlags);
assert upstream.getOutputShape() == inputShape;
}
@Override
final boolean opIsStateful() {
return true;
}
@Override
abstract <P_IN> Node<Long> opEvaluateParallel(PipelineHelper<Long> helper,
Spliterator<P_IN> spliterator,
IntFunction<Long[]> generator);
}
}