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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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85
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13 import org.eclipse.jface.internal.databinding.viewers.ViewerElementSet;
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78
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14
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15 import java.lang.all;
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16
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17 import java.util.Collection;
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18 import java.util.Collections;
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19 import java.util.HashSet;
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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.runtime.Assert;
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27 import org.eclipse.jface.viewers.CheckStateChangedEvent;
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28 import org.eclipse.jface.viewers.ICheckStateListener;
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29 import org.eclipse.jface.viewers.ICheckable;
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30
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31 /**
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32 *
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33 * @since 1.2
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34 */
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35 public class CheckableCheckedElementsObservableSet :
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36 AbstractObservableSet {
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37 private ICheckable checkable;
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38 private Set wrappedSet;
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39 private Object elementType;
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40 private ICheckStateListener listener;
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41
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42 /**
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43 * Constructs a new instance on the given realm and checkable.
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44 *
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45 * @param realm
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46 * the observable's realm
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47 * @param checkable
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48 * the ICheckable to track
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49 * @param elementType
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50 * type of elements in the set
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51 */
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52 public this(Realm realm,
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53 ICheckable checkable, Object elementType) {
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54 this(realm, checkable, elementType, new HashSet());
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55 }
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56
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57 /**
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58 * Constructs a new instance of the given realm, and checkable,
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59 *
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60 * @param realm
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61 * the observable's realm
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62 * @param checkable
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63 * the ICheckable to track
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64 * @param elementType
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65 * type of elements in the set
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66 * @param wrappedSet
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67 * the set being wrapped
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68 */
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69 public this(Realm realm,
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70 ICheckable checkable, Object elementType, Set wrappedSet) {
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71 super(realm);
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72 Assert.isNotNull(cast(Object)checkable, "Checkable cannot be null"); //$NON-NLS-1$
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73 Assert.isNotNull(cast(Object)wrappedSet, "Wrapped set cannot be null"); //$NON-NLS-1$
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74 this.checkable = checkable;
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75 this.wrappedSet = wrappedSet;
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76 this.elementType = elementType;
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77
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78 listener = new class(wrappedSet) ICheckStateListener {
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79 Set wrappedSet_;
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80 this(Set s){ wrappedSet_ = wrappedSet;}
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81 public void checkStateChanged(CheckStateChangedEvent event) {
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82 Object element = event.getElement();
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83 if (event.getChecked()) {
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84 if (wrappedSet_.add(element))
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85 fireSetChange(Diffs.createSetDiff(Collections
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86 .singleton(element), Collections.EMPTY_SET));
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87 } else {
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88 if (wrappedSet_.remove(element))
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89 fireSetChange(Diffs.createSetDiff(
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90 Collections.EMPTY_SET, Collections
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91 .singleton(element)));
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92 }
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93 }
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94 };
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95 checkable.addCheckStateListener(listener);
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96 }
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97
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98 protected Set getWrappedSet() {
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99 return wrappedSet;
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100 }
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101
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102 Set createDiffSet() {
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103 return new HashSet();
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104 }
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105
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106 public Object getElementType() {
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107 return elementType;
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108 }
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109
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110 public bool add(String o) {
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111 return add(stringcast(o));
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112 }
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113 public bool add(Object o) {
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114 getterCalled();
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115 bool added = wrappedSet.add(o);
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116 if (added) {
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117 checkable.setChecked(o, true);
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118 fireSetChange(Diffs.createSetDiff(Collections.singleton(o),
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119 Collections.EMPTY_SET));
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120 }
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121 return added;
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122 }
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123
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124 alias AbstractObservableSet.remove remove;
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125 public bool remove(String o) {
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126 return remove(stringcast(o));
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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 removed = wrappedSet.remove(o);
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131 if (removed) {
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132 checkable.setChecked(o, false);
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133 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET,
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134 Collections.singleton(o)));
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135 }
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136 return removed;
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137 }
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138
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139 public bool addAll(Collection c) {
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140 getterCalled();
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141 Set additions = createDiffSet();
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142 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
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143 Object element = iterator.next();
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144 if (wrappedSet.add(element)) {
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145 checkable.setChecked(element, true);
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146 additions.add(element);
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147 }
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148 }
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149 bool changed = !additions.isEmpty();
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150 if (changed)
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151 fireSetChange(Diffs.createSetDiff(additions, Collections.EMPTY_SET));
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152 return changed;
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153 }
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154
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155 public bool removeAll(Collection c) {
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156 getterCalled();
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157 Set removals = createDiffSet();
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158 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
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159 Object element = iterator.next();
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160 if (wrappedSet.remove(element)) {
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161 checkable.setChecked(element, false);
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162 removals.add(element);
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163 }
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164 }
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165 bool changed = !removals.isEmpty();
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166 if (changed)
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167 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
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168 return changed;
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169 }
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170
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171 public bool retainAll(Collection c) {
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172 getterCalled();
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173
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174 // To ensure that elements are compared correctly, e.g. ViewerElementSet
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175 Set toRetain = createDiffSet();
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176 toRetain.addAll(c);
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177
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178 Set removals = createDiffSet();
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179 for (Iterator iterator = wrappedSet.iterator(); iterator.hasNext();) {
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180 Object element = iterator.next();
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181 if (!toRetain.contains(element)) {
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182 iterator.remove();
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183 checkable.setChecked(element, false);
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184 removals.add(element);
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185 }
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186 }
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187 bool changed = !removals.isEmpty();
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188 if (changed)
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189 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
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190 return changed;
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191 }
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192
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193 public void clear() {
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194 removeAll(wrappedSet);
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195 }
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196
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197 public Iterator iterator() {
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198 getterCalled();
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199 final Iterator wrappedIterator = wrappedSet.iterator();
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200 return new class() Iterator {
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201 private Object last = null;
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202
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203 public bool hasNext() {
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204 getterCalled();
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205 return wrappedIterator.hasNext();
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206 }
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207
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208 public Object next() {
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209 getterCalled();
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210 return last = wrappedIterator.next();
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211 }
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212
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213 public void remove() {
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214 getterCalled();
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215 wrappedIterator.remove();
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216 checkable.setChecked(last, false);
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217 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET,
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218 Collections.singleton(last)));
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219 }
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220 };
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221 }
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222
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223 public synchronized void dispose() {
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224 if (checkable !is null) {
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225 checkable.removeCheckStateListener(listener);
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226 checkable = null;
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227 listener = null;
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228 }
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229 super.dispose();
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230 }
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231 }
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