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comparison org.eclipse.core.databinding/src/org/eclipse/core/databinding/observable/set/WritableSet.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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children 383ce7bd736b
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2006-2008 IBM Corporation 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 * IBM Corporation - initial API and implementation
10 * Brad Reynolds - bug 147515
11 * Matthew Hall - bug 221351
12 *******************************************************************************/
13
14 module org.eclipse.core.databinding.observable.set.WritableSet;
15
16 import java.lang.all;
17
18 import java.util.Collection;
19 import java.util.Collections;
20 import java.util.HashSet;
21 import java.util.Iterator;
22 import java.util.Set;
23
24 import org.eclipse.core.databinding.observable.Diffs;
25 import org.eclipse.core.databinding.observable.Realm;
26
27 /**
28 * Mutable (writable) implementation of {@link IObservableSet}.
29 *
30 * <p>
31 * This class is thread safe. All state accessing methods must be invoked from
32 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
33 * listeners may be invoked from any thread.
34 * </p>
35 *
36 * @since 1.0
37 */
38 public class WritableSet : ObservableSet {
39
40 /**
41 * Constructs a new empty instance in the default realm with a
42 * <code>null</code> element type.
43 *
44 */
45 public this() {
46 this(Realm.getDefault());
47 }
48
49 /**
50 * Constructs a new instance in the default realm containing the
51 * elements of the given collection. Changes to the given collection after
52 * calling this method do not affect the contents of the created WritableSet.
53 *
54 * @param c
55 * @param elementType
56 * can be <code>null</code>
57 */
58 public this(Collection c, Object elementType) {
59 this(Realm.getDefault(), new HashSet(c), elementType);
60 }
61
62 /**
63 * Constructs a new empty instance in the given realm and a
64 * <code>null</code> element type.
65 *
66 * @param realm
67 */
68 public this(Realm realm) {
69 this(realm, new HashSet(), null);
70 }
71
72 /**
73 * Constructs a new instance in the default realm with the given element
74 * type, containing the elements of the given collection. Changes to the
75 * given collection after calling this method do not affect the contents of
76 * the created WritableSet.
77 *
78 * @param realm
79 * @param c
80 * @param elementType
81 * can be <code>null</code>
82 */
83 public this(Realm realm, Collection c, Object elementType) {
84 super(realm, new HashSet(c), elementType);
85 this.elementType = elementType;
86 }
87
88 public bool add(Object o) {
89 getterCalled();
90 bool added = wrappedSet.add(o);
91 if (added) {
92 fireSetChange(Diffs.createSetDiff(Collections.singleton(o), Collections.EMPTY_SET));
93 }
94 return added;
95 }
96
97 public bool addAll(Collection c) {
98 getterCalled();
99 Set additions = new HashSet();
100 Iterator it = c.iterator();
101 while (it.hasNext()) {
102 Object element = it.next();
103 if (wrappedSet.add(element)) {
104 additions.add(element);
105 }
106 }
107 if (additions.size() > 0) {
108 fireSetChange(Diffs.createSetDiff(additions, Collections.EMPTY_SET));
109 return true;
110 }
111 return false;
112 }
113
114 public bool remove(Object o) {
115 getterCalled();
116 bool removed = wrappedSet.remove(o);
117 if (removed) {
118 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, Collections
119 .singleton(o)));
120 }
121 return removed;
122 }
123
124 public bool removeAll(Collection c) {
125 getterCalled();
126 Set removes = new HashSet();
127 Iterator it = c.iterator();
128 while (it.hasNext()) {
129 Object element = it.next();
130 if (wrappedSet.remove(element)) {
131 removes.add(element);
132 }
133 }
134 if (removes.size() > 0) {
135 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
136 return true;
137 }
138 return false;
139 }
140
141 public bool retainAll(Collection c) {
142 getterCalled();
143 Set removes = new HashSet();
144 Iterator it = wrappedSet.iterator();
145 while (it.hasNext()) {
146 Object element = it.next();
147 if (!c.contains(element)) {
148 it.remove();
149 removes.add(element);
150 }
151 }
152 if (removes.size() > 0) {
153 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
154 return true;
155 }
156 return false;
157 }
158
159 public void clear() {
160 getterCalled();
161 Set removes = new HashSet(wrappedSet);
162 wrappedSet.clear();
163 fireSetChange(Diffs.createSetDiff(Collections.EMPTY_SET, removes));
164 }
165
166 /**
167 * @param elementType can be <code>null</code>
168 * @return new instance with the default realm
169 */
170 public static WritableSet withElementType(Object elementType) {
171 return new WritableSet(Realm.getDefault(), new HashSet(), elementType);
172 }
173 }