OneUniverse.java revision 16177:89ef4b822745 
1/*
2 * Copyright (c) 2006, 2007, 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     6276988
27 * @summary All enum constants in a class should share a single "universe".
28 * @modules java.base/java.util:open
29 */
30
31import java.lang.reflect.Field;
32import java.math.RoundingMode;
33import java.util.EnumSet;
34
35public class OneUniverse {
36
37    private static final Field universeField;
38
39    static {
40        try {
41            universeField = EnumSet.class.getDeclaredField("universe");
42        } catch (NoSuchFieldException e) {
43            throw new AssertionError(e);
44        }
45        universeField.setAccessible(true);
46    }
47
48    public static void main(String... args) {
49
50        EnumSet<RoundingMode> noneSet = EnumSet.noneOf(RoundingMode.class);
51        EnumSet<RoundingMode> allSet  = EnumSet.allOf(RoundingMode.class);
52
53        if (getUniverse(noneSet) != getUniverse(allSet)) {
54            throw new AssertionError(
55                    "Multiple universes detected.  Inform the bridge!");
56        }
57    }
58
59    private static <E extends Enum<E>> Enum<E>[] getUniverse(EnumSet<E> set) {
60        try {
61            return (Enum<E>[]) universeField.get(set);
62        } catch (IllegalAccessException e) {
63            throw new AssertionError(e);
64        }
65    }
66}
67