1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @run testng UnmodifiableMapEntrySet
* @summary Unit tests for wrapping classes should delegate to default methods
*/
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Spliterator;
import java.util.TreeMap;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;
import static org.testng.Assert.assertEquals;
@Test(groups = "unit")
public class UnmodifiableMapEntrySet {
static Object[][] collections;
static <M extends Map<Integer, Integer>> M fillMap(int size, M m) {
for (int i = 0; i < size; i++) {
m.put(i, i);
}
return m;
}
@DataProvider(name="maps")
static Object[][] mapCases() {
if (collections != null) {
return collections;
}
List<Object[]> cases = new ArrayList<>();
for (int size : new int[] {1, 2, 16}) {
cases.add(new Object[] {
String.format("new HashMap(%d)", size),
(Supplier<Map<Integer, Integer>>)
() -> Collections.unmodifiableMap(fillMap(size, new HashMap<>())) });
cases.add(new Object[] {
String.format("new TreeMap(%d)", size),
(Supplier<Map<Integer, Integer>>)
() -> Collections.unmodifiableSortedMap(fillMap(size, new TreeMap<>())) });
}
return cases.toArray(new Object[0][]);
}
static class EntryConsumer implements Consumer<Map.Entry<Integer, Integer>> {
int updates;
@Override
public void accept(Map.Entry<Integer, Integer> me) {
try {
me.setValue(Integer.MAX_VALUE);
updates++;
} catch (UnsupportedOperationException e) {
}
}
void assertNoUpdates() {
assertEquals(updates, 0, "Updates to entries");
}
}
void testWithEntryConsumer(Consumer<EntryConsumer> c) {
EntryConsumer ec = new EntryConsumer();
c.accept(ec);
ec.assertNoUpdates();
}
@Test(dataProvider = "maps")
public void testForEach(String d, Supplier<Map<Integer, Integer>> ms) {
testWithEntryConsumer(
ec -> ms.get().entrySet().forEach(ec));
}
@Test(dataProvider = "maps")
public void testIteratorForEachRemaining(String d, Supplier<Map<Integer, Integer>> ms) {
testWithEntryConsumer(
ec -> ms.get().entrySet().iterator().forEachRemaining(ec));
}
@Test(dataProvider = "maps")
public void testIteratorNext(String d, Supplier<Map<Integer, Integer>> ms) {
testWithEntryConsumer(ec -> {
for (Map.Entry<Integer, Integer> me : ms.get().entrySet()) {
ec.accept(me);
}
});
}
@Test(dataProvider = "maps")
public void testSpliteratorForEachRemaining(String d, Supplier<Map<Integer, Integer>> ms) {
testSpliterator(
ms.get().entrySet()::spliterator,
// Higher order function returning a consumer that
// traverses all spliterator elements using an EntryConsumer
s -> ec -> s.forEachRemaining(ec));
}
@Test(dataProvider = "maps")
public void testSpliteratorTryAdvance(String d, Supplier<Map<Integer, Integer>> ms) {
testSpliterator(
ms.get().entrySet()::spliterator,
// Higher order function returning a consumer that
// traverses all spliterator elements using an EntryConsumer
s -> ec -> { while (s.tryAdvance(ec)); });
}
void testSpliterator(Supplier<Spliterator<Map.Entry<Integer, Integer>>> ss,
// Higher order function that given a spliterator returns a
// consumer for that spliterator which traverses elements
// using an EntryConsumer
Function<Spliterator<Map.Entry<Integer, Integer>>, Consumer<EntryConsumer>> sc) {
testWithEntryConsumer(sc.apply(ss.get()));
Spliterator<Map.Entry<Integer, Integer>> s = ss.get();
Spliterator<Map.Entry<Integer, Integer>> split = s.trySplit();
if (split != null) {
testWithEntryConsumer(sc.apply(split));
testWithEntryConsumer(sc.apply(s));
}
}
@Test(dataProvider = "maps")
public void testStreamForEach(String d, Supplier<Map<Integer, Integer>> ms) {
testWithEntryConsumer(ec -> ms.get().entrySet().stream().forEach(ec));
}
@Test(dataProvider = "maps")
public void testParallelStreamForEach(String d, Supplier<Map<Integer, Integer>> ms) {
testWithEntryConsumer(ec -> ms.get().entrySet().parallelStream().forEach(ec));
}
}
|
