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