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1
11 package org.eclipse.ui.internal.preferences;
12
13 import java.util.ArrayList  ;
14
15
18 public abstract class PropertyMapAdapter implements IDynamicPropertyMap {
19
20 private PropertyListenerList listeners;
21 private int ignoreCount = 0;
22 private ArrayList queuedEvents = new ArrayList ();
23
24
27 public final void addListener(IPropertyMapListener listener) {
28 if (listeners == null) {
29 listeners = new PropertyListenerList();
30 attachListener();
31 }
32 listeners.add(listener);
33 }
34
35
38 public final void removeListener(IPropertyMapListener listener) {
39 if (listeners != null) {
40 listeners.remove(listener);
41 if (listeners.isEmpty()) {
42 detachListener();
43 listeners = null;
44 }
45 }
46 }
47
48
51 public final boolean isCommonProperty(String propertyId) {
52 return true;
53 }
54
55
60 public void dispose() {
61 if (listeners != null) {
62 detachListener();
63 listeners = null;
64 }
65 }
66
67 protected final void firePropertyChange(String prefId) {
68 if (ignoreCount > 0) {
69 queuedEvents.add(prefId);
70 return;
71 }
72
73 if (listeners != null) {
74 listeners.firePropertyChange(prefId);
75 }
76 }
77
78 public final void addListener(String [] eventsOfInterest, IPropertyMapListener listener) {
79 if (listeners == null) {
80 listeners = new PropertyListenerList();
81 attachListener();
82 }
83 listeners.add(eventsOfInterest, listener);
84 }
85
86 protected final void firePropertyChange(String [] prefIds) {
87 if (ignoreCount > 0) {
88 for (int i = 0; i < prefIds.length; i++) {
89 queuedEvents.add(prefIds[i]);
90 }
91 return;
92 }
93
94 if (listeners != null) {
95 listeners.firePropertyChange(prefIds);
96 }
97 }
98
99 public final void startTransaction() {
100 ignoreCount++;
101 }
102
103 public final void endTransaction() {
104 ignoreCount--;
105 if (ignoreCount == 0 && !queuedEvents.isEmpty()) {
106 if (listeners != null) {
107 listeners.firePropertyChange((String []) queuedEvents.toArray(new String [queuedEvents.size()]));
108 }
109 queuedEvents.clear();
110 }
111 }
112
113 public boolean equals(Object toCompare) {
114 return toCompare instanceof IPropertyMap && PropertyUtil.isEqual(this, (IPropertyMap)toCompare);
115 }
116
117 protected abstract void attachListener();
118 protected abstract void detachListener();
119 }
120 |
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