1 /* 2 * Copyright (c) 2012, 2016, 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 24 /* 25 * @test 26 * @summary flat-map operations 27 * @bug 8044047 8076458 28 */ 29 30 package org.openjdk.tests.java.util.stream; 31 32 import org.testng.annotations.Test; 33 34 import java.util.Arrays; 35 import java.util.Collection; 36 import java.util.Collections; 37 import java.util.concurrent.atomic.AtomicInteger; 38 import java.util.function.Function; 39 import java.util.function.Supplier; 40 import java.util.stream.DoubleStream; 41 import java.util.stream.DoubleStreamTestDataProvider; 42 import java.util.stream.IntStream; 43 import java.util.stream.IntStreamTestDataProvider; 44 import java.util.stream.LongStream; 45 import java.util.stream.LongStreamTestDataProvider; 46 import java.util.stream.OpTestCase; 47 import java.util.stream.Stream; 48 import java.util.stream.StreamTestDataProvider; 49 import java.util.stream.TestData; 50 51 import static java.util.stream.LambdaTestHelpers.*; 52 import static java.util.stream.ThowableHelper.checkNPE; 53 54 @Test 55 public class FlatMapOpTest extends OpTestCase { 56 57 public void testNullMapper() { 58 checkNPE(() -> Stream.of(1).flatMap(null)); 59 checkNPE(() -> IntStream.of(1).flatMap(null)); 60 checkNPE(() -> LongStream.of(1).flatMap(null)); 61 checkNPE(() -> DoubleStream.of(1).flatMap(null)); 62 } 63 64 static final Function<Integer, Stream<Integer>> integerRangeMapper 65 = e -> IntStream.range(0, e).boxed(); 66 67 public void testFlatMap() { 68 String[] stringsArray = {"hello", "there", "", "yada"}; 69 Stream<String> strings = Arrays.asList(stringsArray).stream(); 70 assertConcat(strings.flatMap(flattenChars).iterator(), "hellothereyada"); 71 72 assertCountSum(countTo(10).stream().flatMap(mfId), 10, 55); 73 assertCountSum(countTo(10).stream().flatMap(mfNull), 0, 0); 74 assertCountSum(countTo(3).stream().flatMap(mfLt), 6, 4); 75 76 exerciseOps(TestData.Factory.ofArray("stringsArray", stringsArray), s -> s.flatMap(flattenChars)); 77 exerciseOps(TestData.Factory.ofArray("LONG_STRING", new String[] {LONG_STRING}), s -> s.flatMap(flattenChars)); 78 } 79 80 @Test 81 public void testClose() { 82 AtomicInteger before = new AtomicInteger(); 83 AtomicInteger onClose = new AtomicInteger(); 84 85 Supplier<Stream<Integer>> s = () -> { 86 before.set(0); onClose.set(0); 87 return Stream.of(1, 2).peek(e -> before.getAndIncrement()); 88 }; 89 90 s.get().flatMap(i -> Stream.of(i, i).onClose(onClose::getAndIncrement)).count(); 91 assertEquals(before.get(), onClose.get()); 92 93 s.get().flatMapToInt(i -> IntStream.of(i, i).onClose(onClose::getAndIncrement)).count(); 94 assertEquals(before.get(), onClose.get()); 95 96 s.get().flatMapToLong(i -> LongStream.of(i, i).onClose(onClose::getAndIncrement)).count(); 97 assertEquals(before.get(), onClose.get()); 98 99 s.get().flatMapToDouble(i -> DoubleStream.of(i, i).onClose(onClose::getAndIncrement)).count(); 100 assertEquals(before.get(), onClose.get()); 101 } 102 103 @Test 104 public void testIntClose() { 105 AtomicInteger before = new AtomicInteger(); 106 AtomicInteger onClose = new AtomicInteger(); 107 108 IntStream.of(1, 2).peek(e -> before.getAndIncrement()). 109 flatMap(i -> IntStream.of(i, i).onClose(onClose::getAndIncrement)).count(); 110 assertEquals(before.get(), onClose.get()); 111 } 112 113 @Test 114 public void testLongClose() { 115 AtomicInteger before = new AtomicInteger(); 116 AtomicInteger onClose = new AtomicInteger(); 117 118 LongStream.of(1, 2).peek(e -> before.getAndIncrement()). 119 flatMap(i -> LongStream.of(i, i).onClose(onClose::getAndIncrement)).count(); 120 assertEquals(before.get(), onClose.get()); 121 } 122 123 @Test 124 public void testDoubleClose() { 125 AtomicInteger before = new AtomicInteger(); 126 AtomicInteger onClose = new AtomicInteger(); 127 128 DoubleStream.of(1, 2).peek(e -> before.getAndIncrement()). 129 flatMap(i -> DoubleStream.of(i, i).onClose(onClose::getAndIncrement)).count(); 130 assertEquals(before.get(), onClose.get()); 131 } 132 133 @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class) 134 public void testOps(String name, TestData.OfRef<Integer> data) { 135 Collection<Integer> result = exerciseOps(data, s -> s.flatMap(mfId)); 136 assertEquals(data.size(), result.size()); 137 138 result = exerciseOps(data, s -> s.flatMap(mfNull)); 139 assertEquals(0, result.size()); 140 141 result = exerciseOps(data, s-> s.flatMap(e -> Stream.empty())); 142 assertEquals(0, result.size()); 143 } 144 145 @Test(dataProvider = "StreamTestData<Integer>.small", dataProviderClass = StreamTestDataProvider.class) 146 public void testOpsX(String name, TestData.OfRef<Integer> data) { 147 exerciseOps(data, s -> s.flatMap(mfLt)); 148 exerciseOps(data, s -> s.flatMap(integerRangeMapper)); 149 exerciseOps(data, s -> s.flatMap((Integer e) -> IntStream.range(0, e).boxed().limit(10))); 150 } 151 152 // 153 154 @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class) 155 public void testIntOps(String name, TestData.OfInt data) { 156 Collection<Integer> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToInt(j -> j))); 157 assertEquals(data.size(), result.size()); 158 assertContents(data, result); 159 160 result = exerciseOps(data, s -> s.flatMap(i -> IntStream.empty())); 161 assertEquals(0, result.size()); 162 } 163 164 @Test(dataProvider = "IntStreamTestData.small", dataProviderClass = IntStreamTestDataProvider.class) 165 public void testIntOpsX(String name, TestData.OfInt data) { 166 exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, e))); 167 exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, e).limit(10))); 168 } 169 170 // 171 172 @Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class) 173 public void testLongOps(String name, TestData.OfLong data) { 174 Collection<Long> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToLong(j -> j))); 175 assertEquals(data.size(), result.size()); 176 assertContents(data, result); 177 178 result = exerciseOps(data, s -> LongStream.empty()); 179 assertEquals(0, result.size()); 180 } 181 182 @Test(dataProvider = "LongStreamTestData.small", dataProviderClass = LongStreamTestDataProvider.class) 183 public void testLongOpsX(String name, TestData.OfLong data) { 184 exerciseOps(data, s -> s.flatMap(e -> LongStream.range(0, e))); 185 exerciseOps(data, s -> s.flatMap(e -> LongStream.range(0, e).limit(10))); 186 } 187 188 // 189 190 @Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class) 191 public void testDoubleOps(String name, TestData.OfDouble data) { 192 Collection<Double> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToDouble(j -> j))); 193 assertEquals(data.size(), result.size()); 194 assertContents(data, result); 195 196 result = exerciseOps(data, s -> DoubleStream.empty()); 197 assertEquals(0, result.size()); 198 } 199 200 @Test(dataProvider = "DoubleStreamTestData.small", dataProviderClass = DoubleStreamTestDataProvider.class) 201 public void testDoubleOpsX(String name, TestData.OfDouble data) { 202 exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, (int) e).asDoubleStream())); 203 exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, (int) e).limit(10).asDoubleStream())); 204 } 205 }