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/*
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* Copyright (c) 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.Comparator;
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import java.util.Iterator;
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import java.util.Objects;
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import java.util.Optional;
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import java.util.Spliterator;
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import java.util.function.BiConsumer;
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import java.util.function.BiFunction;
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import java.util.function.BinaryOperator;
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import java.util.function.Consumer;
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import java.util.function.Function;
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import java.util.function.IntFunction;
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import java.util.function.Predicate;
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import java.util.function.Supplier;
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import java.util.function.ToDoubleFunction;
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import java.util.function.ToIntFunction;
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import java.util.function.ToLongFunction;
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/**
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* A {@code Stream} implementation that delegates operations to another {@code
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* Stream}.
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*
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* @param <T> type of stream elements for this stream and underlying delegate
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* stream
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*
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* @since 1.8
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*/
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public class DelegatingStream<T> implements Stream<T> {
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final private Stream<T> delegate;
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/**
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* Construct a {@code Stream} that delegates operations to another {@code
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* Stream}.
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*
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* @param delegate the underlying {@link Stream} to which we delegate all
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* {@code Stream} methods
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* @throws NullPointerException if the delegate is null
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*/
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public DelegatingStream(Stream<T> delegate) {
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this.delegate = Objects.requireNonNull(delegate);
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}
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// -- BaseStream methods --
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@Override
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public Spliterator<T> spliterator() {
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return delegate.spliterator();
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}
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@Override
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public boolean isParallel() {
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return delegate.isParallel();
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}
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@Override
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public Iterator<T> iterator() {
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return delegate.iterator();
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}
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// -- Stream methods --
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@Override
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public Stream<T> filter(Predicate<? super T> predicate) {
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return delegate.filter(predicate);
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}
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@Override
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public <R> Stream<R> map(Function<? super T, ? extends R> mapper) {
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return delegate.map(mapper);
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}
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@Override
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public IntStream mapToInt(ToIntFunction<? super T> mapper) {
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return delegate.mapToInt(mapper);
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}
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@Override
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public LongStream mapToLong(ToLongFunction<? super T> mapper) {
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return delegate.mapToLong(mapper);
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}
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@Override
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public DoubleStream mapToDouble(ToDoubleFunction<? super T> mapper) {
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return delegate.mapToDouble(mapper);
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}
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@Override
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public <R> Stream<R> flatMap(Function<? super T, ? extends Stream<? extends R>> mapper) {
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return delegate.flatMap(mapper);
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}
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@Override
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public IntStream flatMapToInt(Function<? super T, ? extends IntStream> mapper) {
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return delegate.flatMapToInt(mapper);
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}
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@Override
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public LongStream flatMapToLong(Function<? super T, ? extends LongStream> mapper) {
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return delegate.flatMapToLong(mapper);
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}
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@Override
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public DoubleStream flatMapToDouble(Function<? super T, ? extends DoubleStream> mapper) {
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return delegate.flatMapToDouble(mapper);
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}
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@Override
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public Stream<T> distinct() {
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return delegate.distinct();
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}
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@Override
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public Stream<T> sorted() {
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return delegate.sorted();
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}
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@Override
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public Stream<T> sorted(Comparator<? super T> comparator) {
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return delegate.sorted(comparator);
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}
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@Override
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public void forEach(Consumer<? super T> action) {
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delegate.forEach(action);
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}
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@Override
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public void forEachOrdered(Consumer<? super T> action) {
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delegate.forEachOrdered(action);
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}
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@Override
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public Stream<T> peek(Consumer<? super T> consumer) {
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return delegate.peek(consumer);
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}
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@Override
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public Stream<T> limit(long maxSize) {
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return delegate.limit(maxSize);
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}
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@Override
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public Stream<T> substream(long startingOffset) {
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return delegate.substream(startingOffset);
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}
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@Override
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public Stream<T> substream(long startingOffset, long endingOffset) {
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return delegate.substream(startingOffset, endingOffset);
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}
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@Override
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public <A> A[] toArray(IntFunction<A[]> generator) {
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return delegate.toArray(generator);
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}
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@Override
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public Object[] toArray() {
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return delegate.toArray();
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}
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@Override
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public T reduce(T identity, BinaryOperator<T> accumulator) {
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return delegate.reduce(identity, accumulator);
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}
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@Override
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public Optional<T> reduce(BinaryOperator<T> accumulator) {
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return delegate.reduce(accumulator);
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}
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@Override
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public <U> U reduce(U identity, BiFunction<U, ? super T, U> accumulator,
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BinaryOperator<U> combiner) {
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return delegate.reduce(identity, accumulator, combiner);
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}
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@Override
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public <R> R collect(Supplier<R> resultFactory,
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BiConsumer<R, ? super T> accumulator,
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BiConsumer<R, R> combiner) {
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return delegate.collect(resultFactory, accumulator, combiner);
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}
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@Override
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public <R> R collect(Collector<? super T, R> collector) {
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return delegate.collect(collector);
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}
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@Override
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public Optional<T> max(Comparator<? super T> comparator) {
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return delegate.max(comparator);
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}
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@Override
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public Optional<T> min(Comparator<? super T> comparator) {
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return delegate.min(comparator);
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}
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@Override
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public long count() {
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return delegate.count();
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}
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@Override
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public boolean anyMatch(Predicate<? super T> predicate) {
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return delegate.anyMatch(predicate);
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}
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@Override
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public boolean allMatch(Predicate<? super T> predicate) {
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return delegate.allMatch(predicate);
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}
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@Override
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public boolean noneMatch(Predicate<? super T> predicate) {
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return delegate.noneMatch(predicate);
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}
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@Override
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public Optional<T> findFirst() {
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return delegate.findFirst();
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}
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@Override
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public Optional<T> findAny() {
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return delegate.findAny();
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}
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@Override
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public Stream<T> unordered() {
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return delegate.unordered();
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}
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@Override
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public Stream<T> sequential() {
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return delegate.sequential();
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}
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@Override
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public Stream<T> parallel() {
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return delegate.parallel();
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}
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}
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