1 /*
   2  * Copyright (c) 2012, 2015, 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
  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         exerciseOps(data, s -> s.flatMap(mfLt));
 145         exerciseOps(data, s -> s.flatMap(integerRangeMapper));
 146         exerciseOps(data, s -> s.flatMap((Integer e) -> IntStream.range(0, e).boxed().limit(10)));
 147     }
 148 
 149     //
 150 
 151     @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
 152     public void testIntOps(String name, TestData.OfInt data) {
 153         Collection<Integer> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToInt(j -> j)));
 154         assertEquals(data.size(), result.size());
 155         assertContents(data, result);
 156 
 157         result = exerciseOps(data, s -> s.flatMap(i -> IntStream.empty()));
 158         assertEquals(0, result.size());
 159 
 160         exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, e)));
 161         exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, e).limit(10)));
 162     }
 163 
 164     //
 165 
 166     @Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class)
 167     public void testLongOps(String name, TestData.OfLong data) {
 168         Collection<Long> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToLong(j -> j)));
 169         assertEquals(data.size(), result.size());
 170         assertContents(data, result);
 171 
 172         result = exerciseOps(data, s -> LongStream.empty());
 173         assertEquals(0, result.size());
 174 
 175         exerciseOps(data, s -> s.flatMap(e -> LongStream.range(0, e)));
 176         exerciseOps(data, s -> s.flatMap(e -> LongStream.range(0, e).limit(10)));
 177     }
 178 
 179     //
 180 
 181     @Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
 182     public void testDoubleOps(String name, TestData.OfDouble data) {
 183         Collection<Double> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToDouble(j -> j)));
 184         assertEquals(data.size(), result.size());
 185         assertContents(data, result);
 186 
 187         result = exerciseOps(data, s -> DoubleStream.empty());
 188         assertEquals(0, result.size());
 189 
 190         exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, (int) e).asDoubleStream()));
 191         exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, (int) e).limit(10).asDoubleStream()));
 192     }
 193 }