1/*
2 * Copyright (c) 2007, 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 6585904
27 * @run testng CheckedIdentityMap
28 * @summary Checked collections with underlying maps with identity comparisons
29 */
30
31import java.util.*;
32import static java.util.Collections.*;
33
34import static org.testng.Assert.assertEquals;
35import static org.testng.Assert.assertNotEquals;
36
37import org.testng.annotations.Test;
38
39public class CheckedIdentityMap {
40
41    @Test
42    public void testHashCode() {
43        Map<Integer, Integer> m1 = checkedMap(
44            new IdentityHashMap<Integer, Integer>(),
45            Integer.class, Integer.class);
46        Map<Integer, Integer> m2 = checkedMap(
47            new IdentityHashMap<Integer, Integer>(),
48            Integer.class, Integer.class);
49        // NB: these are unique instances. Compare vs. Integer.valueOf(1)
50        m1.put(new Integer(1), new Integer(1));
51        m2.put(new Integer(1), new Integer(1));
52
53        Map.Entry<Integer, Integer> e1 = m1.entrySet().iterator().next();
54        Map.Entry<Integer, Integer> e2 = m2.entrySet().iterator().next();
55
56        assertNotEquals(e1, e2);
57        assertEquals(e1.hashCode(), hashCode(e1));
58        assertEquals(e2.hashCode(), hashCode(e2));
59    }
60
61    static int hashCode(Map.Entry<?,?> e) {
62        return (System.identityHashCode(e.getKey()) ^
63                System.identityHashCode(e.getValue()));
64    }
65}
66