Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/collect/HashIdentity.java @ 4240:394424b7df1a
Disabled certain DaCapo tests for fastdebug testing in the gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 06 Jan 2012 18:35:39 +0100 |
parents | bc8527f3071c |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.collect; |
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24 |
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25 import com.sun.max.*; |
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26 |
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27 /** |
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28 * Defines the semantics of key comparison in a {@linkplain HashMapping hash based data structure} where reference |
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29 * identity is used for {@linkplain #equivalent(Object, Object) equivalence} and the hash code are obtained from |
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30 * {@link System#identityHashCode(Object)}. There is a {@linkplain #instance(Class) singleton} instance of this class. |
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31 */ |
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32 public final class HashIdentity<T> implements HashEquivalence<T> { |
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33 |
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34 private HashIdentity() { |
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35 } |
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36 |
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37 public boolean equivalent(T object1, T object2) { |
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38 return object1 == object2; |
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39 } |
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40 |
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41 public int hashCode(T object) { |
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42 if (object == null) { |
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43 return 0; |
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44 } |
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45 return System.identityHashCode(object); |
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46 } |
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48 private static final HashIdentity identity = new HashIdentity<>(); |
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49 |
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50 public static <T> HashIdentity<T> instance(Class<HashIdentity<T>> type) { |
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51 return Utils.cast(type, identity); |
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52 } |
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53 } |