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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 124684)
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10 ******************************************************************************/
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11
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12 module org.eclipse.jface.internal.databinding.viewers.CheckableCheckedElementsObservableSet;
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13
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14 import java.lang.all;
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15
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16 import java.util.Collection;
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17 import java.util.Collections;
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18 import java.util.HashSet;
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19 import java.util.Iterator;
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20 import java.util.Set;
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21
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22 import org.eclipse.core.databinding.observable.Diffs;
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23 import org.eclipse.core.databinding.observable.Realm;
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24 import org.eclipse.core.databinding.observable.set.AbstractObservableSet;
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25 import org.eclipse.core.runtime.Assert;
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26 import org.eclipse.jface.viewers.CheckStateChangedEvent;
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27 import org.eclipse.jface.viewers.ICheckStateListener;
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28 import org.eclipse.jface.viewers.ICheckable;
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29
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30 /**
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31 *
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32 * @since 1.2
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33 */
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34 public class CheckableCheckedElementsObservableSet :
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35 AbstractObservableSet {
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36 private ICheckable checkable;
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37 private Set wrappedSet;
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38 private Object elementType;
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39 private ICheckStateListener listener;
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40
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41 /**
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42 * Constructs a new instance on the given realm and checkable.
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43 *
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44 * @param realm
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45 * the observable's realm
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46 * @param checkable
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47 * the ICheckable to track
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48 * @param elementType
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49 * type of elements in the set
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50 */
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51 public this(Realm realm,
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52 ICheckable checkable, Object elementType) {
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53 this(realm, checkable, elementType, new HashSet());
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54 }
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55
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56 /**
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57 * Constructs a new instance of the given realm, and checkable,
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58 *
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59 * @param realm
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60 * the observable's realm
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61 * @param checkable
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62 * the ICheckable to track
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63 * @param elementType
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64 * type of elements in the set
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65 * @param wrappedSet
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66 * the set being wrapped
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67 */
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68 public this(Realm realm,
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69 ICheckable checkable, Object elementType, Set wrappedSet) {
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70 super(realm);
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71 Assert.isNotNull(checkable, "Checkable cannot be null"); //$NON-NLS-1$
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72 Assert.isNotNull(wrappedSet, "Wrapped set cannot be null"); //$NON-NLS-1$
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73 this.checkable = checkable;
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74 this.wrappedSet = wrappedSet;
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75 this.elementType = elementType;
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76
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77 listener = new class(wrappedSet) ICheckStateListener {
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78 Set wrappedSet_;
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79 this(Set s){ wrappedSet_ = wrappedSet;}
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80 public void checkStateChanged(CheckStateChangedEvent event) {
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81 Object element = event.getElement();
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82 if (event.getChecked()) {
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83 if (wrappedSet_.add(element))
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84 fireSetChange(Diffs.createSetDiff(Collections
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85 .singleton(element), Collections.EMPTY_SET));
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86 } else {
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87 if (wrappedSet_.remove(element))
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88 fireSetChange(Diffs.createSetDiff(
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89 Collections.EMPTY_SET, Collections
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90 .singleton(element)));
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91 }
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92 }
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93 };
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94 checkable.addCheckStateListener(listener);
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95 }
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96
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97 protected Set getWrappedSet() {
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98 return wrappedSet;
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99 }
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100
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101 Set createDiffSet() {
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102 return new HashSet();
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103 }
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104
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105 public Object getElementType() {
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106 return elementType;
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107 }
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108
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109 public bool add(Object o) {
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110 getterCalled();
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111 bool added = wrappedSet.add(o);
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112 if (added) {
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113 checkable.setChecked(o, true);
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114 fireSetChange(Diffs.createSetDiff(Collections.singleton(o),
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115 Collections.EMPTY_SET));
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116 }
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117 return added;
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118 }
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119
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120 public bool remove(Object o) {
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121 getterCalled();
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122 bool removed = wrappedSet.remove(o);
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123 if (removed) {
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124 checkable.setChecked(o, false);
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125 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET,
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126 Collections.singleton(o)));
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127 }
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128 return removed;
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129 }
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130
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131 public bool addAll(Collection c) {
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132 getterCalled();
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133 Set additions = createDiffSet();
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134 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
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135 Object element = iterator.next();
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136 if (wrappedSet.add(element)) {
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137 checkable.setChecked(element, true);
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138 additions.add(element);
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139 }
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140 }
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141 bool changed = !additions.isEmpty();
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142 if (changed)
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143 fireSetChange(Diffs.createSetDiff(additions, Collections.EMPTY_SET));
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144 return changed;
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145 }
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146
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147 public bool removeAll(Collection c) {
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148 getterCalled();
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149 Set removals = createDiffSet();
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150 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
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151 Object element = iterator.next();
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152 if (wrappedSet.remove(element)) {
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153 checkable.setChecked(element, false);
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154 removals.add(element);
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155 }
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156 }
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157 bool changed = !removals.isEmpty();
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158 if (changed)
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159 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
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160 return changed;
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161 }
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162
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163 public bool retainAll(Collection c) {
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164 getterCalled();
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165
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166 // To ensure that elements are compared correctly, e.g. ViewerElementSet
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167 Set toRetain = createDiffSet();
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168 toRetain.addAll(c);
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169
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170 Set removals = createDiffSet();
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171 for (Iterator iterator = wrappedSet.iterator(); iterator.hasNext();) {
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172 Object element = iterator.next();
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173 if (!toRetain.contains(element)) {
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174 iterator.remove();
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175 checkable.setChecked(element, false);
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176 removals.add(element);
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177 }
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178 }
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179 bool changed = !removals.isEmpty();
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180 if (changed)
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181 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
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182 return changed;
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183 }
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184
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185 public void clear() {
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186 removeAll(wrappedSet);
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187 }
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188
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189 public Iterator iterator() {
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190 getterCalled();
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191 final Iterator wrappedIterator = wrappedSet.iterator();
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192 return new class() Iterator {
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193 private Object last = null;
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194
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195 public bool hasNext() {
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196 getterCalled();
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197 return wrappedIterator.hasNext();
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198 }
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199
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200 public Object next() {
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201 getterCalled();
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202 return last = wrappedIterator.next();
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203 }
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204
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205 public void remove() {
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206 getterCalled();
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207 wrappedIterator.remove();
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208 checkable.setChecked(last, false);
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209 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET,
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210 Collections.singleton(last)));
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211 }
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212 };
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213 }
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214
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215 public synchronized void dispose() {
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216 if (checkable !is null) {
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217 checkable.removeCheckStateListener(listener);
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218 checkable = null;
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219 listener = null;
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220 }
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221 super.dispose();
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222 }
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223 }
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