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.*;
  26 import java.util.stream.*;
  27 
  28 import org.testng.annotations.Test;
  29 
  30 import java.util.function.Function;
  31 
  32 import static java.util.stream.LambdaTestHelpers.*;
  33 
  34 
  35 /**
  36  * FindFirstOpTest
  37  */
  38 @Test
  39 public class FindFirstOpTest extends OpTestCase {
  40 
  41     public void testFindFirst() {
  42         assertFalse(Collections.emptySet().stream().findFirst().isPresent(), "no result");
  43         assertFalse(countTo(10).stream().filter(x -> x > 10).findFirst().isPresent(), "no result");
  44 
  45         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.filter(pEven).findFirst().get()}).stream(), Arrays.asList(2));
  46         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.findFirst().get()}).stream(), Arrays.asList(1));
  47         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.filter(e -> e == 499).findFirst().get()}).stream(), Arrays.asList(499));
  48         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.filter(e -> e == 999).findFirst().get()}).stream(), Arrays.asList(999));
  49         exerciseOps(countTo(0), s -> Arrays.asList(new Integer[]{s.findFirst().orElse(-1)}).stream(), Arrays.asList(-1));
  50         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.filter(e -> e == 1499).findFirst().orElse(-1)}).stream(), Arrays.asList(-1));
  51     }
  52 
  53     @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
  54     public void testStream(String name, TestData.OfRef<Integer> data) {
  55         exerciseStream(data, s -> s);
  56         exerciseStream(data, s -> s.filter(pTrue));
  57         exerciseStream(data, s -> s.filter(pFalse));
  58         exerciseStream(data, s -> s.filter(pEven));
  59     }
  60 
  61     void exerciseStream(TestData.OfRef<Integer> data, Function<Stream<Integer>, Stream<Integer>> fs) {
  62         Iterator<Integer> i = fs.apply(data.stream()).iterator();
  63         Optional<Integer> expected = i.hasNext() ? Optional.of(i.next()) : Optional.empty();
  64         withData(data).terminal(fs, s -> s.findFirst())
  65                       .expectedResult(expected)
  66                       .resultAsserter((act, exp, ord, par) -> {
  67                           if (par & !ord) {
  68                               assertContains(act, fs.apply(data.stream()).iterator());
  69                           }
  70                           else {
  71                               assertEquals(act, exp);
  72                           }
  73                       })
  74                       .exercise();
  75     }
  76 
  77     @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
  78     public void testIntStream(String name, TestData.OfInt data) {
  79         exerciseIntStream(data, s -> s);
  80         exerciseIntStream(data, s -> s.filter(ipTrue));
  81         exerciseIntStream(data, s -> s.filter(ipFalse));
  82         exerciseIntStream(data, s -> s.filter(ipEven));
  83     }
  84 
  85     void exerciseIntStream(TestData.OfInt data, Function<IntStream, IntStream> fs) {
  86         OptionalInt r = exerciseTerminalOps(data, fs, s -> s.findFirst());
  87         if (r.isPresent()) {
  88             PrimitiveIterator.OfInt i = fs.apply(data.stream()).iterator();
  89             assertTrue(i.hasNext());
  90             assertEquals(i.nextInt(), r.getAsInt());
  91         }
  92         else {
  93             assertFalse(fs.apply(data.stream()).iterator().hasNext());
  94         }
  95     }
  96 
  97     @Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class)
  98     public void testLongStream(String name, TestData.OfLong data) {
  99         exerciseLongStream(data, s -> s);
 100         exerciseLongStream(data, s -> s.filter(lpTrue));
 101         exerciseLongStream(data, s -> s.filter(lpFalse));
 102         exerciseLongStream(data, s -> s.filter(lpEven));
 103     }
 104 
 105     void exerciseLongStream(TestData.OfLong data, Function<LongStream, LongStream> fs) {
 106         OptionalLong r = exerciseTerminalOps(data, fs, s -> s.findFirst());
 107         if (r.isPresent()) {
 108             PrimitiveIterator.OfLong i = fs.apply(data.stream()).iterator();
 109             assertTrue(i.hasNext());
 110             assertEquals(i.nextLong(), r.getAsLong());
 111         }
 112         else {
 113             assertFalse(fs.apply(data.stream()).iterator().hasNext());
 114         }
 115     }
 116 
 117     @Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
 118     public void testDoubleStream(String name, TestData.OfDouble data) {
 119         exerciseDoubleStream(data, s -> s);
 120         exerciseDoubleStream(data, s -> s.filter(dpTrue));
 121         exerciseDoubleStream(data, s -> s.filter(dpFalse));
 122         exerciseDoubleStream(data, s -> s.filter(dpEven));
 123     }
 124 
 125     void exerciseDoubleStream(TestData.OfDouble data, Function<DoubleStream, DoubleStream> fs) {
 126         OptionalDouble r = exerciseTerminalOps(data, fs, s -> s.findFirst());
 127         if (r.isPresent()) {
 128             PrimitiveIterator.OfDouble i = fs.apply(data.stream()).iterator();
 129             assertTrue(i.hasNext());
 130             assertEquals(i.nextDouble(), r.getAsDouble());
 131         }
 132         else {
 133             assertFalse(fs.apply(data.stream()).iterator().hasNext());
 134         }
 135     }
 136 }