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.
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22 */
23package org.openjdk.tests.java.util.stream;
24
25import org.openjdk.testlib.java.util.stream.*;
26import java.util.*;
27
28import java.util.stream.BaseStream;
29import java.util.stream.Stream;
30import java.util.stream.IntStream;
31import java.util.stream.LongStream;
32import java.util.stream.DoubleStream;
33
34import org.testng.annotations.Test;
35
36import java.util.function.Function;
37
38import static org.openjdk.testlib.java.util.stream.LambdaTestHelpers.*;
39
40
41/**
42 * FindFirstOpTest
43 */
44@Test
45public class FindFirstOpTest extends OpTestCase {
46
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)
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
67    void exerciseStream(TestData.OfRef<Integer> data, Function<Stream<Integer>, Stream<Integer>> fs) {
68        Optional<Integer> r = exerciseTerminalOps(data, fs, s -> s.findFirst());
69        if (r.isPresent()) {
70            Iterator<Integer> i = fs.apply(data.stream()).iterator();
71            assertTrue(i.hasNext());
72            assertEquals(i.next(), r.get());
73        }
74        else {
75            assertFalse(fs.apply(data.stream()).iterator().hasNext());
76        }
77    }
78
79    @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
80    public void testIntStream(String name, TestData.OfInt data) {
81        exerciseIntStream(data, s -> s);
82        exerciseIntStream(data, s -> s.filter(ipTrue));
83        exerciseIntStream(data, s -> s.filter(ipFalse));
84        exerciseIntStream(data, s -> s.filter(ipEven));
85    }
86
87    void exerciseIntStream(TestData.OfInt data, Function<IntStream, IntStream> fs) {
88        OptionalInt r = exerciseTerminalOps(data, fs, s -> s.findFirst());
89        if (r.isPresent()) {
90            PrimitiveIterator.OfInt i = fs.apply(data.stream()).iterator();
91            assertTrue(i.hasNext());
92            assertEquals(i.nextInt(), r.getAsInt());
93        }
94        else {
95            assertFalse(fs.apply(data.stream()).iterator().hasNext());
96        }
97    }
98
99    @Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class)
100    public void testLongStream(String name, TestData.OfLong data) {
101        exerciseLongStream(data, s -> s);
102        exerciseLongStream(data, s -> s.filter(lpTrue));
103        exerciseLongStream(data, s -> s.filter(lpFalse));
104        exerciseLongStream(data, s -> s.filter(lpEven));
105    }
106
107    void exerciseLongStream(TestData.OfLong data, Function<LongStream, LongStream> fs) {
108        OptionalLong r = exerciseTerminalOps(data, fs, s -> s.findFirst());
109        if (r.isPresent()) {
110            PrimitiveIterator.OfLong i = fs.apply(data.stream()).iterator();
111            assertTrue(i.hasNext());
112            assertEquals(i.nextLong(), r.getAsLong());
113        }
114        else {
115            assertFalse(fs.apply(data.stream()).iterator().hasNext());
116        }
117    }
118
119    @Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
120    public void testDoubleStream(String name, TestData.OfDouble data) {
121        exerciseDoubleStream(data, s -> s);
122        exerciseDoubleStream(data, s -> s.filter(dpTrue));
123        exerciseDoubleStream(data, s -> s.filter(dpFalse));
124        exerciseDoubleStream(data, s -> s.filter(dpEven));
125    }
126
127    void exerciseDoubleStream(TestData.OfDouble data, Function<DoubleStream, DoubleStream> fs) {
128        OptionalDouble r = exerciseTerminalOps(data, fs, s -> s.findFirst());
129        if (r.isPresent()) {
130            PrimitiveIterator.OfDouble i = fs.apply(data.stream()).iterator();
131            assertTrue(i.hasNext());
132            assertEquals(i.nextDouble(), r.getAsDouble());
133        }
134        else {
135            assertFalse(fs.apply(data.stream()).iterator().hasNext());
136        }
137    }
138}
139