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root/jsr166/jsr166/src/test/jtreg/util/Collections/EmptyCollectionSerialization.java
Revision: 1.4
Committed: Sun Oct 18 17:34:26 2015 UTC (8 years, 7 months ago) by jsr166
Branch: MAIN
Changes since 1.3: +24 -23 lines
Log Message:
improve tests

File Contents

# Content
1 /*
2 * Copyright (c) 2002, 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
24 /*
25 * @test
26 * @bug 4684279 7129185
27 * @summary Empty utility collections should be singletons
28 * @author Josh Bloch
29 * @run testng EmptyCollectionSerialization
30 */
31
32 import java.util.*;
33 import java.util.function.Supplier;
34 import java.io.*;
35 import org.testng.annotations.Test;
36 import org.testng.annotations.DataProvider;
37
38 import static org.testng.Assert.fail;
39 import static org.testng.Assert.assertSame;
40
41 public class EmptyCollectionSerialization {
42 private static Object patheticDeepCopy(Object o) throws Exception {
43 // Serialize
44 ByteArrayOutputStream bos = new ByteArrayOutputStream();
45 ObjectOutputStream oos = new ObjectOutputStream(bos);
46 oos.writeObject(o);
47 byte[] serializedForm = bos.toByteArray();
48
49 // Deserialize
50 InputStream is = new ByteArrayInputStream(serializedForm);
51 ObjectInputStream ois = new ObjectInputStream(is);
52 return ois.readObject();
53 }
54
55 @Test(dataProvider="SerializableSingletons")
56 public static void serializableSingletons(String description, Supplier<Object> o) {
57 try {
58 Object singleton = o.get();
59 assertSame(o.get(), singleton, description + ": broken Supplier not returning singleton");
60 Object copy = patheticDeepCopy(singleton);
61 assertSame(copy, singleton, description + ": " +
62 copy.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(copy)) +
63 " is not the singleton " +
64 singleton.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(singleton)));
65 } catch (Exception all) {
66 fail(description + ": Unexpected Exception", all);
67 }
68 }
69
70 @DataProvider(name = "SerializableSingletons", parallel = true)
71 public static Iterator<Object[]> navigableMapProvider() {
72 return makeSingletons().iterator();
73 }
74
75 public static Collection<Object[]> makeSingletons() {
76 Object[][] params = {
77 {"Collections.EMPTY_LIST",
78 (Supplier) () -> Collections.EMPTY_LIST},
79 {"Collections.EMPTY_MAP",
80 (Supplier) () -> Collections.EMPTY_MAP},
81 {"Collections.EMPTY_SET",
82 (Supplier) () -> Collections.EMPTY_SET},
83 {"Collections.emptyList()",
84 (Supplier) () -> Collections.emptyList()},
85 {"Collections.emptyMap()",
86 (Supplier) () -> Collections.emptyMap()},
87 {"Collections.emptySet()",
88 (Supplier) () -> Collections.emptySet()},
89 {"Collections.emptySortedSet()",
90 (Supplier) () -> Collections.emptySortedSet()},
91 {"Collections.emptySortedMap()",
92 (Supplier) () -> Collections.emptySortedMap()},
93 {"Collections.emptyNavigableSet()",
94 (Supplier) () -> Collections.emptyNavigableSet()},
95 {"Collections.emptyNavigableMap()",
96 (Supplier) () -> Collections.emptyNavigableMap()},
97 };
98 return Arrays.asList(params);
99 }
100 }