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.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package org.openjdk.tests.java.util.stream;
24
25 import java.util.Collection;
26 import java.util.stream.*;
27
28 import org.testng.annotations.Test;
29
30 import java.util.Arrays;
31 import java.util.List;
32 import java.util.concurrent.atomic.AtomicInteger;
33
34 import static java.util.stream.LambdaTestHelpers.assertCountSum;
35
36 /**
37 * SliceOpTest
38 *
39 * @author Brian Goetz
40 */
41 @Test
42 public class IntSliceOpTest extends OpTestCase {
43
44 private static final int[] EMPTY_INT_ARRAY = new int[0];
45
46 public void testSkip() {
47 assertCountSum(IntStream.range(0, 0).skip(0).boxed(), 0, 0);
48 assertCountSum(IntStream.range(0, 0).skip(4).boxed(), 0, 0);
49 assertCountSum(IntStream.range(1, 5).skip(4).boxed(), 0, 0);
50 assertCountSum(IntStream.range(1, 5).skip(2).boxed(), 2, 7);
51 assertCountSum(IntStream.range(1, 5).skip(0).boxed(), 4, 10);
52
53 assertCountSum(IntStream.range(0, 0).parallel().skip(0).boxed(), 0, 0);
54 assertCountSum(IntStream.range(0, 0).parallel().skip(4).boxed(), 0, 0);
55 assertCountSum(IntStream.range(1, 5).parallel().skip(4).boxed(), 0, 0);
56 assertCountSum(IntStream.range(1, 5).parallel().skip(2).boxed(), 2, 7);
57 assertCountSum(IntStream.range(1, 5).parallel().skip(0).boxed(), 4, 10);
58
59 exerciseOps(EMPTY_INT_ARRAY, s -> s.skip(0), EMPTY_INT_ARRAY);
60 exerciseOps(EMPTY_INT_ARRAY, s -> s.skip(10), EMPTY_INT_ARRAY);
61
62 exerciseOps(IntStream.range(1, 2).toArray(), s -> s.skip(0), IntStream.range(1, 2).toArray());
63 exerciseOps(IntStream.range(1, 2).toArray(), s -> s.skip(1), EMPTY_INT_ARRAY);
64 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(0), IntStream.range(1, 101).toArray());
65 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(10), IntStream.range(11, 101).toArray());
66 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(100), EMPTY_INT_ARRAY);
67 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(200), EMPTY_INT_ARRAY);
68 }
69
70 public void testLimit() {
71 assertCountSum(IntStream.range(0, 0).limit(4).boxed(), 0, 0);
72 assertCountSum(IntStream.range(1, 3).limit(4).boxed(), 2, 3);
73 assertCountSum(IntStream.range(1, 5).limit(4).boxed(), 4, 10);
74 assertCountSum(IntStream.range(1, 9).limit(4).boxed(), 4, 10);
75
76 assertCountSum(IntStream.range(0, 0).parallel().limit(4).boxed(), 0, 0);
77 assertCountSum(IntStream.range(1, 3).parallel().limit(4).boxed(), 2, 3);
78 assertCountSum(IntStream.range(1, 5).parallel().limit(4).boxed(), 4, 10);
79 assertCountSum(IntStream.range(1, 9).parallel().limit(4).boxed(), 4, 10);
80
81 exerciseOps(EMPTY_INT_ARRAY, s -> s.limit(0), EMPTY_INT_ARRAY);
82 exerciseOps(EMPTY_INT_ARRAY, s -> s.limit(10), EMPTY_INT_ARRAY);
83
84 exerciseOps(IntStream.range(1, 2).toArray(), s -> s.limit(0), EMPTY_INT_ARRAY);
85 exerciseOps(IntStream.range(1, 2).toArray(), s -> s.limit(1), IntStream.range(1, 2).toArray());
86 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.limit(0), EMPTY_INT_ARRAY);
87 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.limit(10), IntStream.range(1, 11).toArray());
88 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.limit(10).limit(10), IntStream.range(1, 11).toArray());
89 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.limit(100), IntStream.range(1, 101).toArray());
90 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.limit(100).limit(10), IntStream.range(1, 11).toArray());
91 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.limit(200), IntStream.range(1, 101).toArray());
92 }
93
94 public void testSkipLimit() {
95 exerciseOps(EMPTY_INT_ARRAY, s -> s.skip(0).limit(0), EMPTY_INT_ARRAY);
96 exerciseOps(EMPTY_INT_ARRAY, s -> s.skip(0).limit(10), EMPTY_INT_ARRAY);
97 exerciseOps(EMPTY_INT_ARRAY, s -> s.skip(10).limit(0), EMPTY_INT_ARRAY);
98 exerciseOps(EMPTY_INT_ARRAY, s -> s.skip(10).limit(10), EMPTY_INT_ARRAY);
99
100 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(0).limit(100), IntStream.range(1, 101).toArray());
101 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(0).limit(10), IntStream.range(1, 11).toArray());
102 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(0).limit(0), EMPTY_INT_ARRAY);
103 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(10).limit(100), IntStream.range(11, 101).toArray());
104 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(10).limit(10), IntStream.range(11, 21).toArray());
105 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(10).limit(0), EMPTY_INT_ARRAY);
106 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(100).limit(100), EMPTY_INT_ARRAY);
107 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(100).limit(10), EMPTY_INT_ARRAY);
108 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(100).limit(0), EMPTY_INT_ARRAY);
109 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(200).limit(100), EMPTY_INT_ARRAY);
110 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(200).limit(10), EMPTY_INT_ARRAY);
111 exerciseOps(IntStream.range(1, 101).toArray(), s -> s.skip(200).limit(0), EMPTY_INT_ARRAY);
112 }
113
114 private int sliceSize(int dataSize, int skip, int limit) {
115 int size = Math.max(0, dataSize - skip);
116 if (limit >= 0)
117 size = Math.min(size, limit);
118 return size;
119 }
120
121 private int sliceSize(int dataSize, int skip) {
122 return Math.max(0, dataSize - skip);
123 }
124
125 @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
126 public void testSkipOps(String name, TestData.OfInt data) {
127 List<Integer> skips = sizes(data.size());
128
129 for (int s : skips) {
130 setContext("skip", s);
131 Collection<Integer> sr = exerciseOps(data, st -> st.skip(s));
132 assertEquals(sr.size(), sliceSize(data.size(), s));
133
134 sr = exerciseOps(data, st -> st.skip(s).skip(s / 2));
135 assertEquals(sr.size(), sliceSize(sliceSize(data.size(), s), s / 2));
136 }
137 }
138
139 @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
140 public void testSkipLimitOps(String name, TestData.OfInt data) {
141 List<Integer> skips = sizes(data.size());
142 List<Integer> limits = skips;
143
144 for (int s : skips) {
145 setContext("skip", s);
146 for (int limit : limits) {
147 setContext("limit", limit);
148 Collection<Integer> sr = exerciseOps(data, st -> st.skip(s).limit(limit));
149 assertEquals(sr.size(), sliceSize(sliceSize(data.size(), s), 0, limit));
150
151 sr = exerciseOps(data, st -> st.skip(s).limit(limit));
152 assertEquals(sr.size(), sliceSize(data.size(), s, limit));
153 }
154 }
155 }
156
157 @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
158 public void testLimitOps(String name, TestData.OfInt data) {
159 List<Integer> limits = sizes(data.size());
160
161 for (int limit : limits) {
162 setContext("limit", limit);
163 Collection<Integer> sr = exerciseOps(data, st -> st.limit(limit));
164 assertEquals(sr.size(), sliceSize(data.size(), 0, limit));
165
166 sr = exerciseOps(data, st -> st.limit(limit).limit(limit / 2));
167 assertEquals(sr.size(), sliceSize(sliceSize(data.size(), 0, limit), 0, limit / 2));
168 }
169 }
170
171 public void testLimitSort() {
172 exerciseOps(IntStream.range(1, 101).map(i -> 101 - i).toArray(), s -> s.limit(10).sorted());
173 }
174
175 @Test(groups = { "serialization-hostile" })
176 public void testLimitShortCircuit() {
177 for (int l : Arrays.asList(0, 10)) {
178 setContext("limit", l);
179 AtomicInteger ai = new AtomicInteger();
180 IntStream.range(1, 101)
181 .peek(i -> ai.getAndIncrement())
182 .limit(l).toArray();
183 // For the case of a zero limit, one element will get pushed through the sink chain
184 assertEquals(ai.get(), l, "tee block was called too many times");
185 }
186 }
187
188 public void testSkipParallel() {
189 int[] l = IntStream.range(1, 1001).parallel().skip(200).limit(200).sequential().toArray();
190 assertEquals(l.length, 200);
191 assertEquals(l[l.length - 1], 400);
192 }
193
194 public void testLimitParallel() {
195 int[] l = IntStream.range(1, 1001).parallel().limit(500).sequential().toArray();
196 assertEquals(l.length, 500);
197 assertEquals(l[l.length - 1], 500);
198 }
199
200 private List<Integer> sizes(int size) {
201 if (size < 4) {
202 return Arrays.asList(0, 1, 2, 3, 4, 6);
203 }
204 else {
205 return Arrays.asList(0, 1, size / 2, size - 1, size, size + 1, 2 * size);
206 }
207 }
208 }