1 /*
2 * Copyright (c) 2013, 2018, 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 /* @test
25 * @bug 8195649
26 * @summary Basic functional test of OptionalInt
27 * @author Mike Duigou
28 * @build ObscureException
29 * @run testng BasicInt
30 */
31
32 import java.util.NoSuchElementException;
33 import java.util.OptionalInt;
34 import java.util.concurrent.atomic.AtomicBoolean;
35 import java.util.function.IntPredicate;
36 import java.util.List;
37
38 import static org.testng.Assert.*;
39 import org.testng.annotations.Test;
40
41 public class BasicInt {
42
43 static final int INTVAL = 33_550_336;
44 static final int UNEXPECTED = 0xCAFEBABE;
45
46 /**
47 * Checks a block of assertions over an empty OptionalInt.
48 */
49 void checkEmpty(OptionalInt empty) {
50 assertTrue(empty.equals(OptionalInt.empty()));
51 assertTrue(OptionalInt.empty().equals(empty));
52 assertFalse(empty.equals(OptionalInt.of(UNEXPECTED)));
53 assertFalse(OptionalInt.of(UNEXPECTED).equals(empty));
54 assertFalse(empty.equals("unexpected"));
55
56 assertFalse(empty.isPresent());
57 assertTrue(empty.isEmpty());
58
59 assertEquals(empty.hashCode(), 0);
60 assertEquals(empty.orElse(UNEXPECTED), UNEXPECTED);
61 assertEquals(empty.orElseGet(() -> UNEXPECTED), UNEXPECTED);
62
63 assertThrows(NoSuchElementException.class, () -> empty.getAsInt());
64 assertThrows(NoSuchElementException.class, () -> empty.orElseThrow());
65 assertThrows(ObscureException.class, () -> empty.orElseThrow(ObscureException::new));
66
67 var b = new AtomicBoolean();
68 empty.ifPresent(s -> b.set(true));
69 assertFalse(b.get());
70
71 var b1 = new AtomicBoolean(false);
72 var b2 = new AtomicBoolean(false);
73 empty.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
74 assertFalse(b1.get());
75 assertTrue(b2.get());
76
77 assertEquals(empty.toString(), "OptionalInt.empty");
78 }
79
80 /**
81 * Checks a block of assertions over an OptionalInt that is expected to
82 * have a particular value present.
83 */
84 void checkPresent(OptionalInt opt, int expected) {
85 assertFalse(opt.equals(OptionalInt.empty()));
86 assertFalse(OptionalInt.empty().equals(opt));
87 assertTrue(opt.equals(OptionalInt.of(expected)));
88 assertTrue(OptionalInt.of(expected).equals(opt));
89 assertFalse(opt.equals(OptionalInt.of(UNEXPECTED)));
90 assertFalse(OptionalInt.of(UNEXPECTED).equals(opt));
91 assertFalse(opt.equals("unexpected"));
92
93 assertTrue(opt.isPresent());
94 assertEquals(opt.hashCode(), Integer.hashCode(expected));
95 assertEquals(opt.orElse(UNEXPECTED), expected);
96 assertEquals(opt.orElseGet(() -> UNEXPECTED), expected);
97
98 assertEquals(opt.getAsInt(), expected);
99 assertEquals(opt.orElseThrow(), expected);
100 assertEquals(opt.orElseThrow(ObscureException::new), expected);
101
102 var b = new AtomicBoolean(false);
103 opt.ifPresent(s -> b.set(true));
104 assertTrue(b.get());
105
106 var b1 = new AtomicBoolean(false);
107 var b2 = new AtomicBoolean(false);
108 opt.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
109 assertTrue(b1.get());
110 assertFalse(b2.get());
111
112 assertEquals(opt.toString(), "OptionalInt[" + expected + "]");
113 }
114
115 @Test(groups = "unit")
116 public void testEmpty() {
117 checkEmpty(OptionalInt.empty());
118 }
119
120 @Test(groups = "unit")
121 public void testPresent() {
122 checkPresent(OptionalInt.of(INTVAL), INTVAL);
123 }
124
125 @Test(groups = "unit")
126 public void testStreamEmpty() {
127 assertEquals(OptionalInt.empty().stream().toArray(), new int[] { });
128 }
129
130 @Test(groups = "unit")
131 public void testStreamPresent() {
132 assertEquals(OptionalInt.of(INTVAL).stream().toArray(), new int[] { INTVAL });
133 }
134
135 @Test(groups = "unit")
136 public void testIsEmpty() {
137 OptionalInt empty = OptionalInt.empty();
138 assertTrue(empty.isEmpty());
139 OptionalInt present = OptionalInt.of(1);
140 assertFalse(present.isEmpty());
141 var integerList = List.of(1, 2, 3, 4, 5);
142 IntPredicate isPositiveNumber = x -> x > 0;
143 IntPredicate isNegativeNumber = x -> x < 0;
144 OptionalInt positiveNumber = integerList.stream().mapToInt(Integer::intValue).filter(isPositiveNumber).findAny();
145 OptionalInt negativeNumber = integerList.stream().mapToInt(Integer::intValue).filter(isNegativeNumber).findAny();
146 assertFalse(positiveNumber.isEmpty());
147 assertTrue(negativeNumber.isEmpty());
148 }
149
150 }