1/*
2 * Copyright (c) 2012, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 */
23package java.util.stream;
24
25import org.testng.Assert;
26
27import java.util.Spliterator;
28import java.util.function.IntFunction;
29
30/** Test helper class for java.util.stream test framework */
31public final class CollectorOps {
32    private CollectorOps() { }
33
34    public static <E_IN> StatefulTestOp<E_IN> collector() {
35        return new StatefulCollector<>(0, StreamShape.REFERENCE);
36    }
37
38    /* Utility classes for collecting output of intermediate pipeline stages */
39    public static class StatefulCollector<E_IN> implements StatefulTestOp<E_IN> {
40        private final int opFlags;
41        private final StreamShape inputShape;
42
43        public StatefulCollector(int opFlags, StreamShape inputShape) {
44            this.opFlags = opFlags;
45            this.inputShape = inputShape;
46        }
47
48        @Override
49        public StreamShape inputShape() {
50            return inputShape;
51        }
52
53        @Override
54        public StreamShape outputShape() {
55            return inputShape;
56        }
57
58        @Override
59        public int opGetFlags() {
60            return opFlags;
61        }
62
63        @Override
64        public Sink<E_IN> opWrapSink(int flags, boolean parallel, Sink<E_IN> sink) {
65            return sink;
66        }
67
68        @Override
69        public <P_IN> Node<E_IN> opEvaluateParallel(PipelineHelper<E_IN> helper,
70                                                    Spliterator<P_IN> spliterator,
71                                                    IntFunction<E_IN[]> generator) {
72            return helper.evaluate(spliterator, false, generator);
73        }
74    }
75
76    public static class TestParallelSizedOp<T> extends StatefulCollector<T> {
77        public TestParallelSizedOp() {
78            this(StreamShape.REFERENCE);
79        }
80
81        protected TestParallelSizedOp(StreamShape shape) {
82            super(0, shape);
83        }
84
85        @Override
86        public <P_IN> Node<T> opEvaluateParallel(PipelineHelper<T> helper,
87                                                 Spliterator<P_IN> spliterator,
88                                                 IntFunction<T[]> generator) {
89            int flags = helper.getStreamAndOpFlags();
90
91            Assert.assertTrue(StreamOpFlag.SIZED.isKnown(flags));
92            return super.opEvaluateParallel(helper, spliterator, generator);
93        }
94
95        public static class OfInt extends TestParallelSizedOp<Integer> {
96            public OfInt() {
97                super(StreamShape.INT_VALUE);
98            }
99        }
100
101        public static class OfLong extends TestParallelSizedOp<Long> {
102            public OfLong() {
103                super(StreamShape.LONG_VALUE);
104            }
105        }
106
107        public static class OfDouble extends TestParallelSizedOp<Double> {
108            public OfDouble() {
109                super(StreamShape.DOUBLE_VALUE);
110            }
111        }
112    }
113}
114