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/* |
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* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* @test |
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* @bug 6585904 |
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* @run testng CheckedIdentityMap |
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* @summary Checked collections with underlying maps with identity comparisons |
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*/ |
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|
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import org.testng.annotations.Test; |
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|
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import java.util.IdentityHashMap; |
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import java.util.Map; |
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|
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import static java.util.Collections.checkedMap; |
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import static org.testng.Assert.assertEquals; |
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import static org.testng.Assert.assertNotEquals; |
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|
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public class CheckedIdentityMap { |
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|
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@Test |
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public void testHashCode() { |
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Map<Integer, Integer> m1 = checkedMap( |
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new IdentityHashMap<Integer, Integer>(), |
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Integer.class, Integer.class); |
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Map<Integer, Integer> m2 = checkedMap( |
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new IdentityHashMap<Integer, Integer>(), |
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Integer.class, Integer.class); |
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// NB: these are unique instances. Compare vs. Integer.valueOf(1) |
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m1.put(new Integer(1), new Integer(1)); |
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m2.put(new Integer(1), new Integer(1)); |
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|
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Map.Entry<Integer, Integer> e1 = m1.entrySet().iterator().next(); |
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Map.Entry<Integer, Integer> e2 = m2.entrySet().iterator().next(); |
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|
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assertNotEquals(e1, e2); |
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assertEquals(e1.hashCode(), hashCode(e1)); |
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assertEquals(e2.hashCode(), hashCode(e2)); |
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} |
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|
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static int hashCode(Map.Entry<?,?> e) { |
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return (System.identityHashCode(e.getKey()) ^ |
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System.identityHashCode(e.getValue())); |
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} |
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} |
