--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/util/stream/DelegatingStream.java Wed Apr 17 14:39:04 2013 -0400
@@ -0,0 +1,270 @@
+/*
+ * 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
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+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();
+ }
+}