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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 147515
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11 * Matthew Hall - bug 221351
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12 *******************************************************************************/
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13
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14 module org.eclipse.core.databinding.observable.set.WritableSet;
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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.Collection;
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19 import java.util.Collections;
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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.Set;
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23
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24 import org.eclipse.core.databinding.observable.Diffs;
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25 import org.eclipse.core.databinding.observable.Realm;
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26
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27 /**
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28 * Mutable (writable) implementation of {@link IObservableSet}.
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29 *
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30 * <p>
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31 * This class is thread safe. All state accessing methods must be invoked from
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32 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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33 * listeners may be invoked from any thread.
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34 * </p>
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35 *
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36 * @since 1.0
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37 */
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38 public class WritableSet : ObservableSet {
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39
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40 /**
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41 * Constructs a new empty instance in the default realm with a
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42 * <code>null</code> element type.
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43 *
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44 */
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45 public this() {
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46 this(Realm.getDefault());
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47 }
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48
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49 /**
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50 * Constructs a new instance in the default realm containing the
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51 * elements of the given collection. Changes to the given collection after
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52 * calling this method do not affect the contents of the created WritableSet.
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53 *
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54 * @param c
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55 * @param elementType
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56 * can be <code>null</code>
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57 */
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58 public this(Collection c, Object elementType) {
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59 this(Realm.getDefault(), new HashSet(c), elementType);
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60 }
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61
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62 /**
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63 * Constructs a new empty instance in the given realm and a
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64 * <code>null</code> element type.
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65 *
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66 * @param realm
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67 */
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68 public this(Realm realm) {
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69 this(realm, new HashSet(), null);
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70 }
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71
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72 /**
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73 * Constructs a new instance in the default realm with the given element
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74 * type, containing the elements of the given collection. Changes to the
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75 * given collection after calling this method do not affect the contents of
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76 * the created WritableSet.
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77 *
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78 * @param realm
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79 * @param c
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80 * @param elementType
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81 * can be <code>null</code>
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82 */
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83 public this(Realm realm, Collection c, Object elementType) {
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84 super(realm, new HashSet(c), elementType);
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85 this.elementType = elementType;
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86 }
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87
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88 public bool add(Object o) {
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89 getterCalled();
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90 bool added = wrappedSet.add(o);
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91 if (added) {
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92 fireSetChange(Diffs.createSetDiff(Collections.singleton(o), Collections.EMPTY_SET));
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93 }
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94 return added;
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95 }
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96
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97 public bool addAll(Collection c) {
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98 getterCalled();
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99 Set additions = new HashSet();
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100 Iterator it = c.iterator();
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101 while (it.hasNext()) {
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102 Object element = it.next();
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103 if (wrappedSet.add(element)) {
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104 additions.add(element);
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105 }
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106 }
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107 if (additions.size() > 0) {
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108 fireSetChange(Diffs.createSetDiff(additions, Collections.EMPTY_SET));
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109 return true;
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110 }
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111 return false;
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112 }
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113
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114 public bool remove(Object o) {
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115 getterCalled();
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116 bool removed = wrappedSet.remove(o);
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117 if (removed) {
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118 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, Collections
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119 .singleton(o)));
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120 }
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121 return removed;
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122 }
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123
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124 public bool removeAll(Collection c) {
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125 getterCalled();
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126 Set removes = new HashSet();
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127 Iterator it = c.iterator();
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128 while (it.hasNext()) {
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129 Object element = it.next();
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130 if (wrappedSet.remove(element)) {
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131 removes.add(element);
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132 }
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133 }
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134 if (removes.size() > 0) {
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135 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
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136 return true;
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137 }
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138 return false;
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139 }
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140
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141 public bool retainAll(Collection c) {
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142 getterCalled();
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143 Set removes = new HashSet();
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144 Iterator it = wrappedSet.iterator();
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145 while (it.hasNext()) {
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146 Object element = it.next();
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147 if (!c.contains(element)) {
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148 it.remove();
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149 removes.add(element);
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150 }
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151 }
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152 if (removes.size() > 0) {
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153 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
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154 return true;
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155 }
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156 return false;
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157 }
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158
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159 public void clear() {
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160 getterCalled();
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161 Set removes = new HashSet(wrappedSet);
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162 wrappedSet.clear();
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163 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
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164 }
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165
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166 /**
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167 * @param elementType can be <code>null</code>
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168 * @return new instance with the default realm
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169 */
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170 public static WritableSet withElementType(Object elementType) {
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171 return new WritableSet(Realm.getDefault(), new HashSet(), elementType);
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172 }
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173 }
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