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/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.util.stream;
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import java.util.IntSummaryStatistics;
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import java.util.Objects;
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import java.util.OptionalDouble;
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import java.util.OptionalInt;
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import java.util.PrimitiveIterator;
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import java.util.Spliterator;
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import java.util.Spliterators;
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import java.util.function.BiConsumer;
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import java.util.function.BinaryOperator;
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import java.util.function.IntBinaryOperator;
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import java.util.function.IntConsumer;
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import java.util.function.IntFunction;
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import java.util.function.IntPredicate;
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import java.util.function.IntToDoubleFunction;
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import java.util.function.IntToLongFunction;
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import java.util.function.IntUnaryOperator;
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import java.util.function.ObjIntConsumer;
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import java.util.function.Supplier;
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/**
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* Abstract base class for an intermediate pipeline stage or pipeline source
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* stage implementing whose elements are of type {@code int}.
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*
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* @param <E_IN> type of elements in the upstream source
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* @since 1.8
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*/
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abstract class IntPipeline<E_IN>
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extends AbstractPipeline<E_IN, Integer, IntStream>
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implements IntStream {
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/**
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* Constructor for the head of a stream pipeline.
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*
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* @param source {@code Supplier<Spliterator>} describing the stream source
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* @param sourceFlags The source flags for the stream source, described in
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* {@link StreamOpFlag}
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* @param parallel {@code true} if the pipeline is parallel
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*/
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IntPipeline(Supplier<? extends Spliterator<Integer>> source,
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int sourceFlags, boolean parallel) {
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super(source, sourceFlags, parallel);
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}
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/**
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* Constructor for the head of a stream pipeline.
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*
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* @param source {@code Spliterator} describing the stream source
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* @param sourceFlags The source flags for the stream source, described in
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* {@link StreamOpFlag}
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* @param parallel {@code true} if the pipeline is parallel
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*/
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IntPipeline(Spliterator<Integer> source,
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int sourceFlags, boolean parallel) {
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super(source, sourceFlags, parallel);
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}
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/**
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* Constructor for appending an intermediate operation onto an existing
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* pipeline.
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*
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* @param upstream the upstream element source
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* @param opFlags the operation flags for the new operation
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*/
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IntPipeline(AbstractPipeline<?, E_IN, ?> upstream, int opFlags) {
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super(upstream, opFlags);
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}
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/**
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* Adapt a {@code Sink<Integer> to an {@code IntConsumer}, ideally simply
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* by casting.
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*/
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private static IntConsumer adapt(Sink<Integer> sink) {
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if (sink instanceof IntConsumer) {
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return (IntConsumer) sink;
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}
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else {
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if (Tripwire.ENABLED)
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Tripwire.trip(AbstractPipeline.class,
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"using IntStream.adapt(Sink<Integer> s)");
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return sink::accept;
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}
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}
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/**
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* Adapt a {@code Spliterator<Integer>} to a {@code Spliterator.OfInt}.
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*
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* @implNote
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* The implementation attempts to cast to a Spliterator.OfInt, and throws an
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* exception if this cast is not possible.
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*/
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private static Spliterator.OfInt adapt(Spliterator<Integer> s) {
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if (s instanceof Spliterator.OfInt) {
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return (Spliterator.OfInt) s;
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}
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else {
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if (Tripwire.ENABLED)
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Tripwire.trip(AbstractPipeline.class,
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"using IntStream.adapt(Spliterator<Integer> s)");
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throw new UnsupportedOperationException("IntStream.adapt(Spliterator<Integer> s)");
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}
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}
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// Shape-specific methods
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@Override
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final StreamShape getOutputShape() {
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return StreamShape.INT_VALUE;
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}
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@Override
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final <P_IN> Node<Integer> evaluateToNode(PipelineHelper<Integer> helper,
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Spliterator<P_IN> spliterator,
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boolean flattenTree,
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IntFunction<Integer[]> generator) {
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return Nodes.collectInt(helper, spliterator, flattenTree);
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}
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@Override
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final <P_IN> Spliterator<Integer> wrap(PipelineHelper<Integer> ph,
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Supplier<Spliterator<P_IN>> supplier,
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boolean isParallel) {
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return new StreamSpliterators.IntWrappingSpliterator<>(ph, supplier, isParallel);
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}
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@Override
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final Spliterator.OfInt lazySpliterator(Supplier<? extends Spliterator<Integer>> supplier) {
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return new StreamSpliterators.DelegatingSpliterator.OfInt((Supplier<Spliterator.OfInt>) supplier);
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}
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@Override
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final void forEachWithCancel(Spliterator<Integer> spliterator, Sink<Integer> sink) {
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Spliterator.OfInt spl = adapt(spliterator);
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IntConsumer adaptedSink = adapt(sink);
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do { } while (!sink.cancellationRequested() && spl.tryAdvance(adaptedSink));
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}
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@Override
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final Node.Builder<Integer> makeNodeBuilder(long exactSizeIfKnown,
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IntFunction<Integer[]> generator) {
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return Nodes.intBuilder(exactSizeIfKnown);
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}
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// IntStream
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@Override
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public final PrimitiveIterator.OfInt iterator() {
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return Spliterators.iteratorFromSpliterator(spliterator());
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}
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@Override
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public final Spliterator.OfInt spliterator() {
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return adapt(super.spliterator());
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}
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// Stateless intermediate ops from IntStream
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@Override
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public final LongStream longs() {
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return new LongPipeline.StatelessOp<Integer>(this, StreamShape.INT_VALUE,
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StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Long> sink) {
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return new Sink.ChainedInt(sink) {
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@Override
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public void accept(int t) {
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downstream.accept((long) t);
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}
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};
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}
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};
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}
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@Override
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public final DoubleStream doubles() {
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return new DoublePipeline.StatelessOp<Integer>(this, StreamShape.INT_VALUE,
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StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Double> sink) {
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return new Sink.ChainedInt(sink) {
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@Override
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public void accept(int t) {
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downstream.accept((double) t);
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}
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};
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}
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};
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}
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@Override
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public final Stream<Integer> boxed() {
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return mapToObj(Integer::valueOf);
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}
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@Override
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public final IntStream map(IntUnaryOperator mapper) {
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Objects.requireNonNull(mapper);
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return new StatelessOp<Integer>(this, StreamShape.INT_VALUE,
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StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Integer> sink) {
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return new Sink.ChainedInt(sink) {
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@Override
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public void accept(int t) {
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downstream.accept(mapper.applyAsInt(t));
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}
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};
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}
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};
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}
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@Override
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public final <U> Stream<U> mapToObj(IntFunction<? extends U> mapper) {
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Objects.requireNonNull(mapper);
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return new ReferencePipeline.StatelessOp<Integer, U>(this, StreamShape.INT_VALUE,
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StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<U> sink) {
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return new Sink.ChainedInt(sink) {
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@Override
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public void accept(int t) {
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downstream.accept(mapper.apply(t));
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}
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};
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}
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};
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}
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@Override
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public final LongStream mapToLong(IntToLongFunction mapper) {
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Objects.requireNonNull(mapper);
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return new LongPipeline.StatelessOp<Integer>(this, StreamShape.INT_VALUE,
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StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Long> sink) {
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return new Sink.ChainedInt(sink) {
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@Override
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public void accept(int t) {
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downstream.accept(mapper.applyAsLong(t));
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}
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};
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}
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};
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}
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@Override
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public final DoubleStream mapToDouble(IntToDoubleFunction mapper) {
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Objects.requireNonNull(mapper);
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return new DoublePipeline.StatelessOp<Integer>(this, StreamShape.INT_VALUE,
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StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Double> sink) {
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return new Sink.ChainedInt(sink) {
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@Override
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public void accept(int t) {
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downstream.accept(mapper.applyAsDouble(t));
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}
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};
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}
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};
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}
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@Override
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public final IntStream flatMap(IntFunction<? extends IntStream> mapper) {
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return new StatelessOp<Integer>(this, StreamShape.INT_VALUE,
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StreamOpFlag.NOT_SORTED | StreamOpFlag.NOT_DISTINCT | StreamOpFlag.NOT_SIZED) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Integer> sink) {
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return new Sink.ChainedInt(sink) {
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public void accept(int t) {
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// We can do better that this too; optimize for depth=0 case and just grab spliterator and forEach it
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IntStream result = mapper.apply(t);
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if (result != null)
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result.sequential().forEach(i -> downstream.accept(i));
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}
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};
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}
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};
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}
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@Override
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public IntStream unordered() {
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if (!isOrdered())
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return this;
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return new StatelessOp<Integer>(this, StreamShape.INT_VALUE, StreamOpFlag.NOT_ORDERED) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Integer> sink) {
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return sink;
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}
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};
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}
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@Override
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public final IntStream filter(IntPredicate predicate) {
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Objects.requireNonNull(predicate);
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return new StatelessOp<Integer>(this, StreamShape.INT_VALUE,
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StreamOpFlag.NOT_SIZED) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Integer> sink) {
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return new Sink.ChainedInt(sink) {
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@Override
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public void accept(int t) {
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if (predicate.test(t))
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downstream.accept(t);
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}
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};
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}
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};
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}
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@Override
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public final IntStream peek(IntConsumer consumer) {
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Objects.requireNonNull(consumer);
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return new StatelessOp<Integer>(this, StreamShape.INT_VALUE,
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0) {
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@Override
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Sink<Integer> opWrapSink(int flags, Sink<Integer> sink) {
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return new Sink.ChainedInt(sink) {
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@Override
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public void accept(int t) {
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consumer.accept(t);
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downstream.accept(t);
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}
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};
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}
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};
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}
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// Stateful intermediate ops from IntStream
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private IntStream slice(long skip, long limit) {
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return SliceOps.makeInt(this, skip, limit);
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}
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@Override
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public final IntStream limit(long maxSize) {
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if (maxSize < 0)
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throw new IllegalArgumentException(Long.toString(maxSize));
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return slice(0, maxSize);
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}
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@Override
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public final IntStream substream(long startingOffset) {
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if (startingOffset < 0)
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throw new IllegalArgumentException(Long.toString(startingOffset));
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if (startingOffset == 0)
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return this;
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else
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return slice(startingOffset, -1);
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}
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@Override
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public final IntStream substream(long startingOffset, long endingOffset) {
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if (startingOffset < 0 || endingOffset < startingOffset)
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throw new IllegalArgumentException(String.format("substream(%d, %d)", startingOffset, endingOffset));
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return slice(startingOffset, endingOffset - startingOffset);
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}
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@Override
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public final IntStream sorted() {
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return SortedOps.makeInt(this);
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}
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@Override
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public final IntStream distinct() {
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// While functional and quick to implement, this approach is not very efficient.
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// An efficient version requires an int-specific map/set implementation.
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return boxed().distinct().mapToInt(i -> i);
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}
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// Terminal ops from IntStream
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@Override
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public void forEach(IntConsumer action) {
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evaluate(ForEachOps.makeInt(action, false));
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}
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@Override
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public void forEachOrdered(IntConsumer action) {
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evaluate(ForEachOps.makeInt(action, true));
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}
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@Override
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public final int sum() {
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return reduce(0, Integer::sum);
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}
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@Override
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public final OptionalInt min() {
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return reduce(Math::min);
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}
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@Override
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public final OptionalInt max() {
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return reduce(Math::max);
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}
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@Override
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public final long count() {
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return longs().map(e -> 1L).sum();
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}
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@Override
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public final OptionalDouble average() {
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long[] avg = collect(() -> new long[2],
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|
433 |
(ll, i) -> {
|
|
434 |
ll[0]++;
|
|
435 |
ll[1] += i;
|
|
436 |
},
|
|
437 |
(ll, rr) -> {
|
|
438 |
ll[0] += rr[0];
|
|
439 |
ll[1] += rr[1];
|
|
440 |
});
|
|
441 |
return avg[0] > 0
|
|
442 |
? OptionalDouble.of((double) avg[1] / avg[0])
|
|
443 |
: OptionalDouble.empty();
|
|
444 |
}
|
|
445 |
|
|
446 |
@Override
|
|
447 |
public final IntSummaryStatistics summaryStatistics() {
|
|
448 |
return collect(IntSummaryStatistics::new, IntSummaryStatistics::accept,
|
|
449 |
IntSummaryStatistics::combine);
|
|
450 |
}
|
|
451 |
|
|
452 |
@Override
|
|
453 |
public final int reduce(int identity, IntBinaryOperator op) {
|
|
454 |
return evaluate(ReduceOps.makeInt(identity, op));
|
|
455 |
}
|
|
456 |
|
|
457 |
@Override
|
|
458 |
public final OptionalInt reduce(IntBinaryOperator op) {
|
|
459 |
return evaluate(ReduceOps.makeInt(op));
|
|
460 |
}
|
|
461 |
|
|
462 |
@Override
|
|
463 |
public final <R> R collect(Supplier<R> resultFactory,
|
|
464 |
ObjIntConsumer<R> accumulator,
|
|
465 |
BiConsumer<R, R> combiner) {
|
|
466 |
BinaryOperator<R> operator = (left, right) -> {
|
|
467 |
combiner.accept(left, right);
|
|
468 |
return left;
|
|
469 |
};
|
|
470 |
return evaluate(ReduceOps.makeInt(resultFactory, accumulator, operator));
|
|
471 |
}
|
|
472 |
|
|
473 |
@Override
|
|
474 |
public final boolean anyMatch(IntPredicate predicate) {
|
|
475 |
return evaluate(MatchOps.makeInt(predicate, MatchOps.MatchKind.ANY));
|
|
476 |
}
|
|
477 |
|
|
478 |
@Override
|
|
479 |
public final boolean allMatch(IntPredicate predicate) {
|
|
480 |
return evaluate(MatchOps.makeInt(predicate, MatchOps.MatchKind.ALL));
|
|
481 |
}
|
|
482 |
|
|
483 |
@Override
|
|
484 |
public final boolean noneMatch(IntPredicate predicate) {
|
|
485 |
return evaluate(MatchOps.makeInt(predicate, MatchOps.MatchKind.NONE));
|
|
486 |
}
|
|
487 |
|
|
488 |
@Override
|
|
489 |
public final OptionalInt findFirst() {
|
|
490 |
return evaluate(FindOps.makeInt(true));
|
|
491 |
}
|
|
492 |
|
|
493 |
@Override
|
|
494 |
public final OptionalInt findAny() {
|
|
495 |
return evaluate(FindOps.makeInt(false));
|
|
496 |
}
|
|
497 |
|
|
498 |
@Override
|
|
499 |
public final int[] toArray() {
|
|
500 |
return Nodes.flattenInt((Node.OfInt) evaluateToArrayNode(Integer[]::new))
|
|
501 |
.asIntArray();
|
|
502 |
}
|
|
503 |
|
|
504 |
//
|
|
505 |
|
|
506 |
/**
|
|
507 |
* Source stage of an IntStream.
|
|
508 |
*
|
|
509 |
* @param <E_IN> type of elements in the upstream source
|
|
510 |
* @since 1.8
|
|
511 |
*/
|
|
512 |
static class Head<E_IN> extends IntPipeline<E_IN> {
|
|
513 |
/**
|
|
514 |
* Constructor for the source stage of an IntStream.
|
|
515 |
*
|
|
516 |
* @param source {@code Supplier<Spliterator>} describing the stream
|
|
517 |
* source
|
|
518 |
* @param sourceFlags the source flags for the stream source, described
|
|
519 |
* in {@link StreamOpFlag}
|
|
520 |
* @param parallel {@code true} if the pipeline is parallel
|
|
521 |
*/
|
|
522 |
Head(Supplier<? extends Spliterator<Integer>> source,
|
|
523 |
int sourceFlags, boolean parallel) {
|
|
524 |
super(source, sourceFlags, parallel);
|
|
525 |
}
|
|
526 |
|
|
527 |
/**
|
|
528 |
* Constructor for the source stage of an IntStream.
|
|
529 |
*
|
|
530 |
* @param source {@code Spliterator} describing the stream source
|
|
531 |
* @param sourceFlags the source flags for the stream source, described
|
|
532 |
* in {@link StreamOpFlag}
|
|
533 |
* @param parallel {@code true} if the pipeline is parallel
|
|
534 |
*/
|
|
535 |
Head(Spliterator<Integer> source,
|
|
536 |
int sourceFlags, boolean parallel) {
|
|
537 |
super(source, sourceFlags, parallel);
|
|
538 |
}
|
|
539 |
|
|
540 |
@Override
|
|
541 |
final boolean opIsStateful() {
|
|
542 |
throw new UnsupportedOperationException();
|
|
543 |
}
|
|
544 |
|
|
545 |
@Override
|
|
546 |
final Sink<E_IN> opWrapSink(int flags, Sink<Integer> sink) {
|
|
547 |
throw new UnsupportedOperationException();
|
|
548 |
}
|
|
549 |
|
|
550 |
// Optimized sequential terminal operations for the head of the pipeline
|
|
551 |
|
|
552 |
@Override
|
|
553 |
public void forEach(IntConsumer action) {
|
|
554 |
if (!isParallel()) {
|
|
555 |
adapt(sourceStageSpliterator()).forEachRemaining(action);
|
|
556 |
}
|
|
557 |
else {
|
|
558 |
super.forEach(action);
|
|
559 |
}
|
|
560 |
}
|
|
561 |
|
|
562 |
@Override
|
|
563 |
public void forEachOrdered(IntConsumer action) {
|
|
564 |
if (!isParallel()) {
|
|
565 |
adapt(sourceStageSpliterator()).forEachRemaining(action);
|
|
566 |
}
|
|
567 |
else {
|
|
568 |
super.forEachOrdered(action);
|
|
569 |
}
|
|
570 |
}
|
|
571 |
}
|
|
572 |
|
|
573 |
/**
|
|
574 |
* Base class for a stateless intermediate stage of an IntStream
|
|
575 |
*
|
|
576 |
* @param <E_IN> type of elements in the upstream source
|
|
577 |
* @since 1.8
|
|
578 |
*/
|
|
579 |
abstract static class StatelessOp<E_IN> extends IntPipeline<E_IN> {
|
|
580 |
/**
|
|
581 |
* Construct a new IntStream by appending a stateless intermediate
|
|
582 |
* operation to an existing stream.
|
|
583 |
* @param upstream The upstream pipeline stage
|
|
584 |
* @param inputShape The stream shape for the upstream pipeline stage
|
|
585 |
* @param opFlags Operation flags for the new stage
|
|
586 |
*/
|
|
587 |
StatelessOp(AbstractPipeline<?, E_IN, ?> upstream,
|
|
588 |
StreamShape inputShape,
|
|
589 |
int opFlags) {
|
|
590 |
super(upstream, opFlags);
|
|
591 |
assert upstream.getOutputShape() == inputShape;
|
|
592 |
}
|
|
593 |
|
|
594 |
@Override
|
|
595 |
final boolean opIsStateful() {
|
|
596 |
return false;
|
|
597 |
}
|
|
598 |
}
|
|
599 |
|
|
600 |
/**
|
|
601 |
* Base class for a stateful intermediate stage of an IntStream.
|
|
602 |
*
|
|
603 |
* @param <E_IN> type of elements in the upstream source
|
|
604 |
* @since 1.8
|
|
605 |
*/
|
|
606 |
abstract static class StatefulOp<E_IN> extends IntPipeline<E_IN> {
|
|
607 |
/**
|
|
608 |
* Construct a new IntStream by appending a stateful intermediate
|
|
609 |
* operation to an existing stream.
|
|
610 |
* @param upstream The upstream pipeline stage
|
|
611 |
* @param inputShape The stream shape for the upstream pipeline stage
|
|
612 |
* @param opFlags Operation flags for the new stage
|
|
613 |
*/
|
|
614 |
StatefulOp(AbstractPipeline<?, E_IN, ?> upstream,
|
|
615 |
StreamShape inputShape,
|
|
616 |
int opFlags) {
|
|
617 |
super(upstream, opFlags);
|
|
618 |
assert upstream.getOutputShape() == inputShape;
|
|
619 |
}
|
|
620 |
|
|
621 |
@Override
|
|
622 |
final boolean opIsStateful() {
|
|
623 |
return true;
|
|
624 |
}
|
|
625 |
|
|
626 |
@Override
|
|
627 |
abstract <P_IN> Node<Integer> opEvaluateParallel(PipelineHelper<Integer> helper,
|
|
628 |
Spliterator<P_IN> spliterator,
|
|
629 |
IntFunction<Integer[]> generator);
|
|
630 |
}
|
|
631 |
}
|