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23 package org.openjdk.tests.java.util.stream;
24 
25 import org.openjdk.testlib.java.util.stream.*;
26 import java.util.*;
27 
28 import java.util.stream.BaseStream;
29 import java.util.stream.Stream;
30 import java.util.stream.IntStream;
31 import java.util.stream.LongStream;
32 import java.util.stream.DoubleStream;
33 
34 import org.testng.annotations.Test;
35 
36 import java.util.function.Function;
37 
38 import static org.openjdk.testlib.java.util.stream.LambdaTestHelpers.*;
39 
40 /**
41  * @test
42  * @bug 8148115
43  */
44 @Test
45 public class FindFirstOpTest extends OpTestCase {
46 
testFindFirst()47     public void testFindFirst() {
48         assertFalse(Collections.emptySet().stream().findFirst().isPresent(), "no result");
49         assertFalse(countTo(10).stream().filter(x -> x > 10).findFirst().isPresent(), "no result");
50 
51         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.filter(pEven).findFirst().get()}).stream(), Arrays.asList(2));
52         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.findFirst().get()}).stream(), Arrays.asList(1));
53         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.filter(e -> e == 499).findFirst().get()}).stream(), Arrays.asList(499));
54         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.filter(e -> e == 999).findFirst().get()}).stream(), Arrays.asList(999));
55         exerciseOps(countTo(0), s -> Arrays.asList(new Integer[]{s.findFirst().orElse(-1)}).stream(), Arrays.asList(-1));
56         exerciseOps(countTo(1000), s -> Arrays.asList(new Integer[]{s.filter(e -> e == 1499).findFirst().orElse(-1)}).stream(), Arrays.asList(-1));
57     }
58 
59     @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
testStream(String name, TestData.OfRef<Integer> data)60     public void testStream(String name, TestData.OfRef<Integer> data) {
61         exerciseStream(data, s -> s);
62         exerciseStream(data, s -> s.filter(pTrue));
63         exerciseStream(data, s -> s.filter(pFalse));
64         exerciseStream(data, s -> s.filter(pEven));
65     }
66 
exerciseStream(TestData.OfRef<Integer> data, Function<Stream<Integer>, Stream<Integer>> fs)67     void exerciseStream(TestData.OfRef<Integer> data, Function<Stream<Integer>, Stream<Integer>> fs) {
68         Iterator<Integer> i = fs.apply(data.stream()).iterator();
69         Optional<Integer> expected = i.hasNext() ? Optional.of(i.next()) : Optional.empty();
70         withData(data).terminal(fs, s -> s.findFirst())
71                       .expectedResult(expected)
72                       .resultAsserter((act, exp, ord, par) -> {
73                           if (par & !ord) {
74                               assertContains(act, fs.apply(data.stream()).iterator());
75                           }
76                           else {
77                               assertEquals(act, exp);
78                           }
79                       })
80                       .exercise();
81     }
82 
83     @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
testIntStream(String name, TestData.OfInt data)84     public void testIntStream(String name, TestData.OfInt data) {
85         exerciseIntStream(data, s -> s);
86         exerciseIntStream(data, s -> s.filter(ipTrue));
87         exerciseIntStream(data, s -> s.filter(ipFalse));
88         exerciseIntStream(data, s -> s.filter(ipEven));
89     }
90 
exerciseIntStream(TestData.OfInt data, Function<IntStream, IntStream> fs)91     void exerciseIntStream(TestData.OfInt data, Function<IntStream, IntStream> fs) {
92         OptionalInt r = exerciseTerminalOps(data, fs, s -> s.findFirst());
93         if (r.isPresent()) {
94             PrimitiveIterator.OfInt i = fs.apply(data.stream()).iterator();
95             assertTrue(i.hasNext());
96             assertEquals(i.nextInt(), r.getAsInt());
97         }
98         else {
99             assertFalse(fs.apply(data.stream()).iterator().hasNext());
100         }
101     }
102 
103     @Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class)
testLongStream(String name, TestData.OfLong data)104     public void testLongStream(String name, TestData.OfLong data) {
105         exerciseLongStream(data, s -> s);
106         exerciseLongStream(data, s -> s.filter(lpTrue));
107         exerciseLongStream(data, s -> s.filter(lpFalse));
108         exerciseLongStream(data, s -> s.filter(lpEven));
109     }
110 
exerciseLongStream(TestData.OfLong data, Function<LongStream, LongStream> fs)111     void exerciseLongStream(TestData.OfLong data, Function<LongStream, LongStream> fs) {
112         OptionalLong r = exerciseTerminalOps(data, fs, s -> s.findFirst());
113         if (r.isPresent()) {
114             PrimitiveIterator.OfLong i = fs.apply(data.stream()).iterator();
115             assertTrue(i.hasNext());
116             assertEquals(i.nextLong(), r.getAsLong());
117         }
118         else {
119             assertFalse(fs.apply(data.stream()).iterator().hasNext());
120         }
121     }
122 
123     @Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
testDoubleStream(String name, TestData.OfDouble data)124     public void testDoubleStream(String name, TestData.OfDouble data) {
125         exerciseDoubleStream(data, s -> s);
126         exerciseDoubleStream(data, s -> s.filter(dpTrue));
127         exerciseDoubleStream(data, s -> s.filter(dpFalse));
128         exerciseDoubleStream(data, s -> s.filter(dpEven));
129     }
130 
exerciseDoubleStream(TestData.OfDouble data, Function<DoubleStream, DoubleStream> fs)131     void exerciseDoubleStream(TestData.OfDouble data, Function<DoubleStream, DoubleStream> fs) {
132         OptionalDouble r = exerciseTerminalOps(data, fs, s -> s.findFirst());
133         if (r.isPresent()) {
134             PrimitiveIterator.OfDouble i = fs.apply(data.stream()).iterator();
135             assertTrue(i.hasNext());
136             assertEquals(i.nextDouble(), r.getAsDouble());
137         }
138         else {
139             assertFalse(fs.apply(data.stream()).iterator().hasNext());
140         }
141     }
142 }
143