/*

 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package java.util.stream;

import java.util.Comparator;

import java.util.Iterator;

import java.util.Objects;

import java.util.Optional;

import java.util.Spliterator;

import java.util.function.BiConsumer;

import java.util.function.BiFunction;

import java.util.function.BinaryOperator;

import java.util.function.Consumer;

import java.util.function.Function;

import java.util.function.IntFunction;

import java.util.function.Predicate;

import java.util.function.Supplier;

import java.util.function.ToDoubleFunction;

import java.util.function.ToIntFunction;

import java.util.function.ToLongFunction;

/**

 * A {@code Stream} implementation that delegates operations to another {@code

 * Stream}.

 *

 * @param <T> type of stream elements for this stream and underlying delegate

 * stream

 *

 * @since 1.8

 */

public class DelegatingStream<T> implements Stream<T> {

    final private Stream<T> delegate;

    /**

     * Construct a {@code Stream} that delegates operations to another {@code

     * Stream}.

     *

     * @param delegate the underlying {@link Stream} to which we delegate all

     *                 {@code Stream} methods

     * @throws NullPointerException if the delegate is null

     */

    public DelegatingStream(Stream<T> delegate) {

        this.delegate = Objects.requireNonNull(delegate);

    }

    // -- BaseStream methods --

    @Override

    public Spliterator<T> spliterator() {

        return delegate.spliterator();

    }

    @Override

    public boolean isParallel() {

        return delegate.isParallel();

    }

    @Override

    public Iterator<T> iterator() {

        return delegate.iterator();

    }

    // -- Stream methods --

    @Override

    public Stream<T> filter(Predicate<? super T> predicate) {

        return delegate.filter(predicate);

    }

    @Override

    public <R> Stream<R> map(Function<? super T, ? extends R> mapper) {

        return delegate.map(mapper);

    }

    @Override

    public IntStream mapToInt(ToIntFunction<? super T> mapper) {

        return delegate.mapToInt(mapper);

    }

    @Override

    public LongStream mapToLong(ToLongFunction<? super T> mapper) {

        return delegate.mapToLong(mapper);

    }

    @Override

    public DoubleStream mapToDouble(ToDoubleFunction<? super T> mapper) {

        return delegate.mapToDouble(mapper);

    }

    @Override

    public <R> Stream<R> flatMap(Function<? super T, ? extends Stream<? extends R>> mapper) {

        return delegate.flatMap(mapper);

    }

    @Override

    public IntStream flatMapToInt(Function<? super T, ? extends IntStream> mapper) {

        return delegate.flatMapToInt(mapper);

    }

    @Override

    public LongStream flatMapToLong(Function<? super T, ? extends LongStream> mapper) {

        return delegate.flatMapToLong(mapper);

    }

    @Override

    public DoubleStream flatMapToDouble(Function<? super T, ? extends DoubleStream> mapper) {

        return delegate.flatMapToDouble(mapper);

    }

    @Override

    public Stream<T> distinct() {

        return delegate.distinct();

    }

    @Override

    public Stream<T> sorted() {

        return delegate.sorted();

    }

    @Override

    public Stream<T> sorted(Comparator<? super T> comparator) {

        return delegate.sorted(comparator);

    }

    @Override

    public void forEach(Consumer<? super T> action) {

        delegate.forEach(action);

    }

    @Override

    public void forEachOrdered(Consumer<? super T> action) {

        delegate.forEachOrdered(action);

    }

    @Override

    public Stream<T> peek(Consumer<? super T> consumer) {

        return delegate.peek(consumer);

    }

    @Override

    public Stream<T> limit(long maxSize) {

        return delegate.limit(maxSize);

    }

    @Override

    public Stream<T> substream(long startingOffset) {

        return delegate.substream(startingOffset);

    }

    @Override

    public Stream<T> substream(long startingOffset, long endingOffset) {

        return delegate.substream(startingOffset, endingOffset);

    }

    @Override

    public <A> A[] toArray(IntFunction<A[]> generator) {

        return delegate.toArray(generator);

    }

    @Override

    public Object[] toArray() {

        return delegate.toArray();

    }

    @Override

    public T reduce(T identity, BinaryOperator<T> accumulator) {

        return delegate.reduce(identity, accumulator);

    }

    @Override

    public Optional<T> reduce(BinaryOperator<T> accumulator) {

        return delegate.reduce(accumulator);

    }

    @Override

    public <U> U reduce(U identity, BiFunction<U, ? super T, U> accumulator,

                        BinaryOperator<U> combiner) {

        return delegate.reduce(identity, accumulator, combiner);

    }

    @Override

    public <R> R collect(Supplier<R> resultFactory,

                         BiConsumer<R, ? super T> accumulator,

                         BiConsumer<R, R> combiner) {

        return delegate.collect(resultFactory, accumulator, combiner);

    }

    @Override

    public <R> R collect(Collector<? super T, R> collector) {

        return delegate.collect(collector);

    }

    @Override

    public Optional<T> max(Comparator<? super T> comparator) {

        return delegate.max(comparator);

    }

    @Override

    public Optional<T> min(Comparator<? super T> comparator) {

        return delegate.min(comparator);

    }

    @Override

    public long count() {

        return delegate.count();

    }

    @Override

    public boolean anyMatch(Predicate<? super T> predicate) {

        return delegate.anyMatch(predicate);

    }

    @Override

    public boolean allMatch(Predicate<? super T> predicate) {

        return delegate.allMatch(predicate);

    }

    @Override

    public boolean noneMatch(Predicate<? super T> predicate) {

        return delegate.noneMatch(predicate);

    }

    @Override

    public Optional<T> findFirst() {

        return delegate.findFirst();

    }

    @Override

    public Optional<T> findAny() {

        return delegate.findAny();

    }

    @Override

    public Stream<T> unordered() {

        return delegate.unordered();

    }

    @Override

    public Stream<T> sequential() {

        return delegate.sequential();

    }

    @Override

    public Stream<T> parallel() {

        return delegate.parallel();

    }

}