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comparison org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/viewers/CheckableCheckedElementsObservableSet.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2008 Matthew Hall and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * Matthew Hall - initial API and implementation (bug 124684)
10 ******************************************************************************/
11
12 module org.eclipse.jface.internal.databinding.viewers.CheckableCheckedElementsObservableSet;
13
14 import java.lang.all;
15
16 import java.util.Collection;
17 import java.util.Collections;
18 import java.util.HashSet;
19 import java.util.Iterator;
20 import java.util.Set;
21
22 import org.eclipse.core.databinding.observable.Diffs;
23 import org.eclipse.core.databinding.observable.Realm;
24 import org.eclipse.core.databinding.observable.set.AbstractObservableSet;
25 import org.eclipse.core.runtime.Assert;
26 import org.eclipse.jface.viewers.CheckStateChangedEvent;
27 import org.eclipse.jface.viewers.ICheckStateListener;
28 import org.eclipse.jface.viewers.ICheckable;
29
30 /**
31 *
32 * @since 1.2
33 */
34 public class CheckableCheckedElementsObservableSet :
35 AbstractObservableSet {
36 private ICheckable checkable;
37 private Set wrappedSet;
38 private Object elementType;
39 private ICheckStateListener listener;
40
41 /**
42 * Constructs a new instance on the given realm and checkable.
43 *
44 * @param realm
45 * the observable's realm
46 * @param checkable
47 * the ICheckable to track
48 * @param elementType
49 * type of elements in the set
50 */
51 public this(Realm realm,
52 ICheckable checkable, Object elementType) {
53 this(realm, checkable, elementType, new HashSet());
54 }
55
56 /**
57 * Constructs a new instance of the given realm, and checkable,
58 *
59 * @param realm
60 * the observable's realm
61 * @param checkable
62 * the ICheckable to track
63 * @param elementType
64 * type of elements in the set
65 * @param wrappedSet
66 * the set being wrapped
67 */
68 public this(Realm realm,
69 ICheckable checkable, Object elementType, Set wrappedSet) {
70 super(realm);
71 Assert.isNotNull(checkable, "Checkable cannot be null"); //$NON-NLS-1$
72 Assert.isNotNull(wrappedSet, "Wrapped set cannot be null"); //$NON-NLS-1$
73 this.checkable = checkable;
74 this.wrappedSet = wrappedSet;
75 this.elementType = elementType;
76
77 listener = new class(wrappedSet) ICheckStateListener {
78 Set wrappedSet_;
79 this(Set s){ wrappedSet_ = wrappedSet;}
80 public void checkStateChanged(CheckStateChangedEvent event) {
81 Object element = event.getElement();
82 if (event.getChecked()) {
83 if (wrappedSet_.add(element))
84 fireSetChange(Diffs.createSetDiff(Collections
85 .singleton(element), Collections.EMPTY_SET));
86 } else {
87 if (wrappedSet_.remove(element))
88 fireSetChange(Diffs.createSetDiff(
89 Collections.EMPTY_SET, Collections
90 .singleton(element)));
91 }
92 }
93 };
94 checkable.addCheckStateListener(listener);
95 }
96
97 protected Set getWrappedSet() {
98 return wrappedSet;
99 }
100
101 Set createDiffSet() {
102 return new HashSet();
103 }
104
105 public Object getElementType() {
106 return elementType;
107 }
108
109 public bool add(Object o) {
110 getterCalled();
111 bool added = wrappedSet.add(o);
112 if (added) {
113 checkable.setChecked(o, true);
114 fireSetChange(Diffs.createSetDiff(Collections.singleton(o),
115 Collections.EMPTY_SET));
116 }
117 return added;
118 }
119
120 public bool remove(Object o) {
121 getterCalled();
122 bool removed = wrappedSet.remove(o);
123 if (removed) {
124 checkable.setChecked(o, false);
125 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET,
126 Collections.singleton(o)));
127 }
128 return removed;
129 }
130
131 public bool addAll(Collection c) {
132 getterCalled();
133 Set additions = createDiffSet();
134 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
135 Object element = iterator.next();
136 if (wrappedSet.add(element)) {
137 checkable.setChecked(element, true);
138 additions.add(element);
139 }
140 }
141 bool changed = !additions.isEmpty();
142 if (changed)
143 fireSetChange(Diffs.createSetDiff(additions, Collections.EMPTY_SET));
144 return changed;
145 }
146
147 public bool removeAll(Collection c) {
148 getterCalled();
149 Set removals = createDiffSet();
150 for (Iterator iterator = c.iterator(); iterator.hasNext();) {
151 Object element = iterator.next();
152 if (wrappedSet.remove(element)) {
153 checkable.setChecked(element, false);
154 removals.add(element);
155 }
156 }
157 bool changed = !removals.isEmpty();
158 if (changed)
159 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
160 return changed;
161 }
162
163 public bool retainAll(Collection c) {
164 getterCalled();
165
166 // To ensure that elements are compared correctly, e.g. ViewerElementSet
167 Set toRetain = createDiffSet();
168 toRetain.addAll(c);
169
170 Set removals = createDiffSet();
171 for (Iterator iterator = wrappedSet.iterator(); iterator.hasNext();) {
172 Object element = iterator.next();
173 if (!toRetain.contains(element)) {
174 iterator.remove();
175 checkable.setChecked(element, false);
176 removals.add(element);
177 }
178 }
179 bool changed = !removals.isEmpty();
180 if (changed)
181 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removals));
182 return changed;
183 }
184
185 public void clear() {
186 removeAll(wrappedSet);
187 }
188
189 public Iterator iterator() {
190 getterCalled();
191 final Iterator wrappedIterator = wrappedSet.iterator();
192 return new class() Iterator {
193 private Object last = null;
194
195 public bool hasNext() {
196 getterCalled();
197 return wrappedIterator.hasNext();
198 }
199
200 public Object next() {
201 getterCalled();
202 return last = wrappedIterator.next();
203 }
204
205 public void remove() {
206 getterCalled();
207 wrappedIterator.remove();
208 checkable.setChecked(last, false);
209 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET,
210 Collections.singleton(last)));
211 }
212 };
213 }
214
215 public synchronized void dispose() {
216 if (checkable !is null) {
217 checkable.removeCheckStateListener(listener);
218 checkable = null;
219 listener = null;
220 }
221 super.dispose();
222 }
223 }