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annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/ObjectLocationIdentity.java @ 12426:492c428f6035

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made use of substitution when deriving a new Providers object
author Doug Simon <doug.simon@oracle.com>
date Mon, 14 Oct 2013 11:24:04 +0200
parents e04a86167368
children f5c368c08508
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1 /*
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2 * Copyright (c) 2013, 2013, 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.oracle.graal.api.meta;
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24
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25 import java.util.*;
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26
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27 /**
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28 * A {@link LocationIdentity} warpping an object.
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29 */
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30 public final class ObjectLocationIdentity implements LocationIdentity {
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31
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32 private static IdentityHashMap<Object, LocationIdentity> map = new IdentityHashMap<>();
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33
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34 private Object object;
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35
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36 public static LocationIdentity create(Object object) {
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37 synchronized (map) {
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38 if (map.containsKey(object)) {
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39 return map.get(object);
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40 } else {
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41 ObjectLocationIdentity locationIdentity = new ObjectLocationIdentity(object);
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42 map.put(object, locationIdentity);
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43 return locationIdentity;
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44 }
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45 }
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46 }
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47
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48 private ObjectLocationIdentity(Object object) {
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49 this.object = object;
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50 }
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51
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52 @Override
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53 public String toString() {
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54 return "Identity(" + object + ")";
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55 }
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56 }