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