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1 /*******************************************************************************
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2 * Copyright (c) 2006-2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Brad Reynolds - bug 164653
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11 * Matthew Hall - bug 184830
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12 *******************************************************************************/
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13
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14 module org.eclipse.core.databinding.observable.map.WritableMap;
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15
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16 import java.lang.all;
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17
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18 import java.util.Collections;
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19 import java.util.HashMap;
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20 import java.util.HashSet;
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21 import java.util.Iterator;
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22 import java.util.Map;
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23 import java.util.Set;
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24
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25 import org.eclipse.core.databinding.observable.Diffs;
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26 import org.eclipse.core.databinding.observable.Realm;
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27 import org.eclipse.core.internal.databinding.Util;
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28
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29 /**
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30 *
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31 * <p>
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32 * This class is thread safe. All state accessing methods must be invoked from
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33 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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34 * listeners may be invoked from any thread.
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35 * </p>
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36 * @since 1.0
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37 */
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38 public class WritableMap : ObservableMap {
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39
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40 /**
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41 * Constructs a new WritableMap on the default realm.
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42 */
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43 public this() {
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44 this(Realm.getDefault());
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45 }
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46
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47 /**
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48 * Constructs a new WritableMap on the given realm.
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49 *
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50 * @param realm
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51 * the realm
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52 */
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53 public this(Realm realm) {
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54 super(realm, new HashMap());
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55 }
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56
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57 /**
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58 * Associates the provided <code>value</code> with the <code>key</code>. Must be invoked from the current realm.
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59 */
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60 public Object put(Object key, Object value) {
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61 checkRealm();
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62 Object result = wrappedMap.put(key, value);
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63 if (!Util.equals(result, value)) {
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64 if (resultisnull) {
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65 fireMapChange(Diffs.createMapDiffSingleAdd(key, value));
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66 } else {
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67 fireMapChange(Diffs.createMapDiffSingleChange(key, result,
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68 value));
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69 }
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70 }
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71 return result;
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72 }
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73
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74 /**
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75 * Removes the value with the provide <code>key</code>. Must be invoked from the current realm.
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76 */
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77 public Object remove(Object key) {
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78 checkRealm();
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79 Object result = wrappedMap.remove(key);
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80 if (result !is null) {
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81 fireMapChange(Diffs.createMapDiffSingleRemove(key, result));
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82 }
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83 return result;
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84 }
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85
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86 /**
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87 * Clears the map. Must be invoked from the current realm.
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88 */
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89 public void clear() {
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90 checkRealm();
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91 if (!isEmpty()) {
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92 Map copy = new HashMap(wrappedMap);
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93 wrappedMap.clear();
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94 fireMapChange(Diffs.createMapDiffRemoveAll(copy));
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95 }
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96 }
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97
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98 /**
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99 * Adds the provided <code>map</code>'s contents to this map. Must be invoked from the current realm.
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100 */
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101 public void putAll(Map map) {
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102 checkRealm();
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103 Set addedKeys = new HashSet(map.size());
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104 Map changes = new HashMap(map.size());
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105 for (Iterator it = map.entrySet().iterator(); it.hasNext();) {
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106 Map.Entry entry = cast(Entry) it.next();
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107 Object previousValue = wrappedMap.put(entry.getKey(), entry.getValue());
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108 if (previousValueisnull) {
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109 addedKeys.add(entry.getKey());
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110 } else {
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111 changes.put(entry.getKey(), previousValue);
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112 }
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113 }
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114 if (!addedKeys.isEmpty() || !changes.isEmpty()) {
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115 fireMapChange(Diffs.createMapDiff(addedKeys, Collections.EMPTY_SET, changes.keySet(), changes, wrappedMap));
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116 }
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117 }
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118
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119 }
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