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1 /*******************************************************************************
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2 * Copyright (c) 2008 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 215531)
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10 * Matthew Hall - bug 230267
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11 ******************************************************************************/
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12
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13 module org.eclipse.jface.internal.databinding.viewers.ObservableViewerElementSet;
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85
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14 import org.eclipse.jface.internal.databinding.viewers.ViewerElementSet;
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78
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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.Iterator;
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21 import java.util.Set;
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22
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23 import org.eclipse.core.databinding.observable.Diffs;
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24 import org.eclipse.core.databinding.observable.Realm;
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25 import org.eclipse.core.databinding.observable.set.AbstractObservableSet;
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26 import org.eclipse.core.databinding.observable.set.IObservableSet;
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27 import org.eclipse.core.databinding.observable.set.WritableSet;
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28 import org.eclipse.core.runtime.Assert;
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29 import org.eclipse.jface.viewers.IElementComparer;
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30 import org.eclipse.jface.viewers.StructuredViewer;
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31
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32 /**
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33 * An {@link IObservableSet} of elements in a {@link StructuredViewer}.
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34 * Elements of the set are compared using an {@link IElementComparer} instead of
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35 * {@link #equals(Object)}.
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36 * <p>
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37 * This class is <i>not</i> a strict implementation the {@link IObservableSet}
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38 * interface. It intentionally violates the {@link Set} contract, which requires
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39 * the use of {@link #equals(Object)} when comparing elements. This class is
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40 * designed for use with {@link StructuredViewer} which uses
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41 * {@link IElementComparer} for element comparisons.
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42 *
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43 *
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44 * @since 1.2
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45 */
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46 public class ObservableViewerElementSet : AbstractObservableSet {
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47 private Set wrappedSet;
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48 private Object elementType;
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49 private IElementComparer comparer;
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50
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51 /**
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52 * Constructs an ObservableViewerElementSet on the given {@link Realm} which
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53 * uses the given {@link IElementComparer} to compare elements.
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54 *
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55 * @param realm
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56 * the realm of the constructed set.
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57 * @param elementType
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58 * the element type of the constructed set.
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59 * @param comparer
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60 * the {@link IElementComparer} used to compare elements.
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61 */
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62 public this(Realm realm, Object elementType,
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63 IElementComparer comparer) {
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64 super(realm);
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65
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66 Assert.isNotNull(cast(Object)comparer);
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67 this.wrappedSet = new ViewerElementSet(comparer);
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68 this.elementType = elementType;
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69 this.comparer = comparer;
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70 }
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71
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72 protected Set getWrappedSet() {
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73 return wrappedSet;
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74 }
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75
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76 public Object getElementType() {
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77 return elementType;
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78 }
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79
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80 public Iterator iterator() {
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81 getterCalled();
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82 final Iterator wrappedIterator = wrappedSet.iterator();
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83 return new class() Iterator {
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84 Object last;
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85
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86 public bool hasNext() {
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87 getterCalled();
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88 return wrappedIterator.hasNext();
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89 }
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90
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91 public Object next() {
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92 getterCalled();
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93 return last = wrappedIterator.next();
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94 }
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95
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96 public void remove() {
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97 getterCalled();
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98 wrappedIterator.remove();
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99 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET,
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100 Collections.singleton(last)));
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101 }
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102 };
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103 }
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104
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105 public bool add(Object o) {
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106 getterCalled();
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107 bool changed = wrappedSet.add(o);
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108 if (changed)
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109 fireSetChange(Diffs.createSetDiff(Collections.singleton(o),
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110 Collections.EMPTY_SET));
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111 return changed;
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112 }
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113
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114 public bool addAll(Collection c) {
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115 getterCalled();
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116 Set additions = new ViewerElementSet(comparer);
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117 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
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118 Object element = iterator.next();
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119 if (wrappedSet.add(element))
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120 additions.add(element);
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121 }
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122 bool changed = !additions.isEmpty();
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123 if (changed)
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124 fireSetChange(Diffs.createSetDiff(additions, Collections.EMPTY_SET));
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125 return changed;
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126 }
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127
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128 public bool remove(Object o) {
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129 getterCalled();
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130 bool changed = wrappedSet.remove(o);
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131 if (changed)
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132 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET,
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133 Collections.singleton(o)));
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134 return changed;
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135 }
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136
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137 public bool removeAll(Collection c) {
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138 getterCalled();
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139 Set removals = new ViewerElementSet(comparer);
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140 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
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141 Object element = iterator.next();
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142 if (wrappedSet.remove(element))
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143 removals.add(element);
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144 }
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145 bool changed = !removals.isEmpty();
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146 if (changed)
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147 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
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148 return changed;
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149 }
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150
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151 public bool retainAll(Collection c) {
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152 getterCalled();
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153 Set removals = new ViewerElementSet(comparer);
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154 Object[] toRetain = c.toArray();
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155 outer: for (Iterator iterator = wrappedSet.iterator(); iterator
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156 .hasNext();) {
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157 Object element = iterator.next();
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158 // Cannot rely on c.contains(element) because we must compare
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159 // elements using IElementComparer.
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160 for (int i = 0; i < toRetain.length; i++) {
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161 if (comparer.opEquals(element, toRetain[i]))
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162 continue outer;
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163 }
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164 iterator.remove();
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165 removals.add(element);
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166 }
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167 bool changed = !removals.isEmpty();
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168 if (changed)
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169 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
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170 return changed;
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171 }
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172
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173 public void clear() {
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174 getterCalled();
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175 if (!wrappedSet.isEmpty()) {
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176 Set removals = wrappedSet;
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177 wrappedSet = new ViewerElementSet(comparer);
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178 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
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179 }
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180 }
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181
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182 /**
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183 * Returns an {@link IObservableSet} for holding viewer elements, using the
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184 * given {@link IElementComparer} for comparisons.
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185 *
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186 * @param realm
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187 * the realm of the returned observable
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188 * @param elementType
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189 * the element type of the returned set
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190 * @param comparer
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191 * the element comparer to use in element comparisons (may be
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192 * null). If null, the returned set will compare elements
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193 * according to the standard contract for {@link Set} interface
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194 * contract.
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195 * @return a Set for holding viewer elements, using the given
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196 * {@link IElementComparer} for comparisons.
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197 */
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198 public static IObservableSet withComparer(Realm realm, Object elementType,
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199 IElementComparer comparer) {
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200 if (comparer is null)
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201 return new WritableSet(realm, Collections.EMPTY_SET, elementType);
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202 return new ObservableViewerElementSet(realm, elementType, comparer);
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203 }
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204 }
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