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annotate graal/com.oracle.max.base/src/com/sun/max/collect/LinkedIdentityHashMap.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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children bc8527f3071c
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3733
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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 java.util.*;
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26
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27 import com.sun.max.*;
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28
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29 /**
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30 */
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31 public class LinkedIdentityHashMap<K, V> extends IdentityHashMap<K, V> implements Iterable<K> {
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32
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33 private final LinkedList<K> order = new LinkedList<K>();
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34
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35 public LinkedIdentityHashMap() {
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36 }
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37
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38 public LinkedIdentityHashMap(int expectedMaxSize) {
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39 super(expectedMaxSize);
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40 }
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41
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42 @Override
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43 public V put(K key, V value) {
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44 final V oldValue = super.put(key, value);
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45 if (oldValue == null) {
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46 if (value != null) {
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47 order.add(key);
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48 }
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49 } else {
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50 if (value == null) {
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51 order.remove(key);
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52 }
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53 }
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54 return oldValue;
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55 }
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56
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57 public Iterator<K> iterator() {
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58 return order.iterator();
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59 }
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60
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61 public K first() {
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62 return order.getFirst();
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63 }
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64
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65 public K last() {
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66 return order.getLast();
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67 }
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68
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69 @Override
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70 public boolean equals(Object other) {
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71 if (other instanceof LinkedIdentityHashMap) {
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72 final LinkedIdentityHashMap map = (LinkedIdentityHashMap) other;
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73 if (order.size() != map.order.size()) {
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74 return false;
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75 }
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76 final Iterator iterator = map.order.iterator();
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77 for (K key : order) {
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78 if (key != iterator.next() || !get(key).equals(map.get(key))) {
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79 return false;
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80 }
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81 }
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82 return true;
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83 }
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84 return false;
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85 }
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86
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87 @Override
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88 public int hashCode() {
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89 return order.hashCode();
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90 }
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91
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92 @Override
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93 public LinkedIdentityHashMap<K, V> clone() {
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94 return Utils.cast(super.clone());
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95 }
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96
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97 public Collection<K> toCollection() {
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98 return keySet();
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99 }
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100 }