|
78
|
1 /*******************************************************************************
|
|
|
2 * Copyright (c) 2006, 2007 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 *******************************************************************************/
|
|
|
11 module org.eclipse.core.databinding.observable.map.BidirectionalMap;
|
|
|
12
|
|
|
13 import java.lang.all;
|
|
|
14
|
|
|
15 import java.util.Collections;
|
|
|
16 import java.util.HashMap;
|
|
|
17 import java.util.HashSet;
|
|
|
18 import java.util.Iterator;
|
|
|
19 import java.util.Map;
|
|
|
20 import java.util.Set;
|
|
|
21
|
|
|
22 import org.eclipse.core.databinding.observable.Realm;
|
|
|
23
|
|
|
24 /**
|
|
|
25 *
|
|
|
26 * <p>
|
|
|
27 * This class is thread safe. All state accessing methods must be invoked from
|
|
|
28 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
|
|
|
29 * listeners may be invoked from any thread.
|
|
|
30 * </p>
|
|
|
31 * @since 1.0
|
|
|
32 *
|
|
|
33 */
|
|
|
34 public class BidirectionalMap : ObservableMap {
|
|
|
35
|
|
|
36 private Map valueToElements = new HashMap();
|
|
|
37
|
|
|
38 private IMapChangeListener mapListener = new class() IMapChangeListener {
|
|
|
39
|
|
|
40 public void handleMapChange(MapChangeEvent event) {
|
|
|
41 MapDiff diff = event.diff;
|
|
|
42 for (Iterator it = diff.getAddedKeys().iterator(); it.hasNext();) {
|
|
|
43 Object addedKey = it.next();
|
|
|
44 addMapping(addedKey, diff.getNewValue(addedKey));
|
|
|
45 }
|
|
|
46 for (Iterator it = diff.getChangedKeys().iterator(); it.hasNext();) {
|
|
|
47 Object changedKey = it.next();
|
|
|
48 removeMapping(changedKey, diff.getOldValue(changedKey));
|
|
|
49 addMapping(changedKey, diff.getNewValue(changedKey));
|
|
|
50 }
|
|
|
51 for (Iterator it = diff.getRemovedKeys().iterator(); it.hasNext();) {
|
|
|
52 Object removedKey = it.next();
|
|
|
53 removeMapping(removedKey, diff.getOldValue(removedKey));
|
|
|
54 }
|
|
|
55 fireMapChange(diff);
|
|
|
56 }
|
|
|
57 };
|
|
|
58
|
|
|
59 /**
|
|
|
60 * @param wrappedMap
|
|
|
61 */
|
|
|
62 public this(IObservableMap wrappedMap) {
|
|
|
63 super(wrappedMap.getRealm(), wrappedMap);
|
|
|
64 wrappedMap.addMapChangeListener(mapListener);
|
|
|
65 for (Iterator it = wrappedMap.entrySet().iterator(); it.hasNext();) {
|
|
|
66 Map.Entry entry = cast(Entry) it.next();
|
|
|
67 addMapping(entry.getKey(), entry.getValue());
|
|
|
68 }
|
|
|
69 }
|
|
|
70
|
|
|
71 /**
|
|
|
72 * @param key
|
|
|
73 * @param value
|
|
|
74 */
|
|
|
75 private void addMapping(Object key, Object value) {
|
|
|
76 Object elementOrSet = valueToElements.get(value);
|
|
|
77 if (elementOrSet is null) {
|
|
|
78 valueToElements.put(value, key);
|
|
|
79 return;
|
|
|
80 }
|
|
|
81 if (!( null !is cast(Set)elementOrSet )) {
|
|
|
82 elementOrSet = new HashSet(Collections.singleton(elementOrSet));
|
|
|
83 valueToElements.put(value, elementOrSet);
|
|
|
84 }
|
|
|
85 Set set = cast(Set) elementOrSet;
|
|
|
86 set.add(key);
|
|
|
87 }
|
|
|
88
|
|
|
89 /**
|
|
|
90 * @param functionValue
|
|
|
91 * @param element
|
|
|
92 */
|
|
|
93 private void removeMapping(Object functionValue, Object element) {
|
|
|
94 Object elementOrSet = valueToElements.get(functionValue);
|
|
|
95 if ( null !is cast(Set)elementOrSet ) {
|
|
|
96 Set set = cast(Set) elementOrSet;
|
|
|
97 set.remove(element);
|
|
|
98 if (set.size() is 0) {
|
|
|
99 valueToElements.remove(functionValue);
|
|
|
100 }
|
|
|
101 } else {
|
|
|
102 valueToElements.remove(functionValue);
|
|
|
103 }
|
|
|
104 }
|
|
|
105
|
|
|
106 }
|
