1 /*
2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.util.stream;
27
28 import java.util.Comparator;
29 import java.util.Objects;
30 import java.util.Optional;
31 import java.util.Spliterator;
32 import java.util.function.BiConsumer;
33 import java.util.function.BiFunction;
34 import java.util.function.BinaryOperator;
35 import java.util.function.BooleanSupplier;
36 import java.util.function.Consumer;
37 import java.util.function.Function;
38 import java.util.function.IntFunction;
39 import java.util.function.Predicate;
40 import java.util.function.Supplier;
41 import java.util.function.ToDoubleFunction;
42 import java.util.function.ToIntFunction;
43 import java.util.function.ToLongFunction;
44
45 /**
46 * A {@code Stream} implementation that delegate operations to another {@code
47 * Stream}.
48 *
49 * @since 1.8
50 */
51 public class DelegatingStream<T> implements Stream<T> {
52 final private Stream<T> delegate;
53
54 /**
55 * Construct a {@code Stream} that delegates operations to another {@code
56 * Stream}.
57 *
58 * @param delegate The {@link Stream} that actually performs the operation
59 * @throws NullPointerException if the delegate is null
60 */
61 public DelegatingStream(Stream<T> delegate) {
62 this.delegate = Objects.requireNonNull(delegate);
63 }
64
65 // -- BaseStream methods --
66
67 public Spliterator<T> spliterator() {
68 return delegate.spliterator();
69 }
70
71 public boolean isParallel() {
72 return delegate.isParallel();
73 }
74
75 public int getStreamFlags() {
76 return delegate.getStreamFlags();
77 }
78
79 // -- Stream methods --
80
81 public Stream<T> filter(Predicate<? super T> predicate) {
82 return delegate.filter(predicate);
83 }
84
85 public <R> Stream<R> map(Function<? super T, ? extends R> mapper) {
86 return delegate.map(mapper);
87 }
88
89 public IntStream map(ToIntFunction<? super T> mapper) {
90 return delegate.map(mapper);
91 }
92
93 public LongStream map(ToLongFunction<? super T> mapper) {
94 return delegate.map(mapper);
95 }
96
97 public DoubleStream map(ToDoubleFunction<? super T> mapper) {
98 return delegate.map(mapper);
99 }
100
101 public <R> Stream<R> explode(BiConsumer<Stream.Downstream<R>, ? super T> exploder) {
102 return delegate.explode(exploder);
103 }
104
105 public Stream<T> distinct() {
106 return delegate.distinct();
107 }
108
109 public Stream<T> sorted() {
110 return delegate.sorted();
111 }
112
113 public Stream<T> sorted(Comparator<? super T> comparator) {
114 return delegate.sorted(comparator);
115 }
116
117 public void forEach(Consumer<? super T> consumer) {
118 delegate.forEach(consumer);
119 }
120
121 public void forEachUntil(Consumer<? super T> consumer, BooleanSupplier until) {
122 delegate.forEachUntil(consumer, until);
123 }
124
125 public Stream<T> peek(Consumer<? super T> consumer) {
126 return delegate.peek(consumer);
127 }
128
129 public Stream<T> limit(long maxSize) {
130 return delegate.limit(maxSize);
131 }
132
133 public Stream<T> substream(long startingOffset) {
134 return delegate.substream(startingOffset);
135 }
136
137 public Stream<T> substream(long startingOffset, long endingOffset) {
138 return delegate.substream(startingOffset, endingOffset);
139 }
140
141 public <A> A[] toArray(IntFunction<A[]> generator) {
142 return delegate.toArray(generator);
143 }
144
145 public T reduce(T identity, BinaryOperator<T> reducer) {
146 return delegate.reduce(identity, reducer);
147 }
148
149 public Optional<T> reduce(BinaryOperator<T> reducer) {
150 return delegate.reduce(reducer);
151 }
152
153 public <U> U reduce(U identity, BiFunction<U, ? super T, U> accumulator,
154 BinaryOperator<U> reducer) {
155 return delegate.reduce(identity, accumulator, reducer);
156 }
157
158 public <R> R collect(Supplier<R> resultFactory,
159 BiConsumer<R, ? super T> accumulator,
160 BiConsumer<R, R> reducer) {
161 return delegate.collect(resultFactory, accumulator, reducer);
162 }
163
164 public <R> R collect(Collector<? super T, R> collector) {
165 return delegate.collect(collector);
166 }
167
168 public <R> R collectUnordered(Collector<? super T, R> collector) {
169 return delegate.collectUnordered(collector);
170 }
171
172 public boolean anyMatch(Predicate<? super T> predicate) {
173 return delegate.anyMatch(predicate);
174 }
175
176 public boolean allMatch(Predicate<? super T> predicate) {
177 return delegate.allMatch(predicate);
178 }
179
180 public boolean noneMatch(Predicate<? super T> predicate) {
181 return delegate.noneMatch(predicate);
182 }
183
184 public Optional<T> findFirst() {
185 return delegate.findFirst();
186 }
187
188 public Optional<T> findAny() {
189 return delegate.findAny();
190 }
191
192 public Stream<T> sequential() {
193 return delegate.sequential();
194 }
195
196 public Stream<T> parallel() {
197 return delegate.parallel();
198 }
199 }