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1
11 package org.eclipse.ui.internal.preferences;
12
13 import java.util.ArrayList  ;
14 import java.util.Collection ;
15 import java.util.Collections ;
16 import java.util.HashMap ;
17 import java.util.HashSet ;
18 import java.util.Iterator ;
19 import java.util.List ;
20 import java.util.Map ;
21
22
25 public final class PropertyListenerList {
26 private Map listeners;
27 private List globalListeners;
28 private static String [] singlePropertyDelta;
29 private static Object mutex = new Object ();
30
31 public PropertyListenerList() {
32 }
33
34 public void firePropertyChange(String prefId) {
35 String [] delta;
36
37 synchronized(mutex) {
41 if (singlePropertyDelta != null) {
42 delta = singlePropertyDelta;
43 singlePropertyDelta = null;
44 } else {
45 delta = new String [] {prefId};
46 }
47 }
48
49 delta[0] = prefId;
50
51 firePropertyChange(delta);
52
53 if (singlePropertyDelta == null) {
56 synchronized(mutex) {
57 singlePropertyDelta = delta;
58 }
59 }
60 }
61
62 public void firePropertyChange(String [] propertyIds) {
63 if (globalListeners != null) {
64 for (Iterator iter = globalListeners.iterator(); iter.hasNext();) {
65 IPropertyMapListener next = (IPropertyMapListener) iter.next();
66
67 next.propertyChanged(propertyIds);
68 }
69 }
70
71 if (listeners != null) {
72
73 Collection result = Collections.EMPTY_SET;
77 HashSet union = null;
78
79 for (int i = 0; i < propertyIds.length; i++) {
80 String property = propertyIds[i];
81
82 List existingListeners = (List )listeners.get(property);
83
84 if (existingListeners != null) {
85 if (result == Collections.EMPTY_SET) {
86 result = existingListeners;
87 } else {
88 if (union == null) {
89 union = new HashSet ();
90 union.addAll(result);
91 result = union;
92 }
93
94 union.addAll(existingListeners);
95 }
96 }
97 }
98
99 for (Iterator iter = result.iterator(); iter.hasNext();) {
100 IPropertyMapListener next = (IPropertyMapListener) iter.next();
101
102 next.propertyChanged(propertyIds);
103 }
104 }
105 }
106
107 public void add(IPropertyMapListener newListener) {
108 if (globalListeners == null) {
109 globalListeners = new ArrayList ();
110 }
111
112 globalListeners.add(newListener);
113 newListener.listenerAttached();
114 }
115
116
123 private void addInternal(String propertyId, IPropertyMapListener newListener) {
124 if (listeners == null) {
125 listeners = new HashMap ();
126 }
127
128 List listenerList = (List )listeners.get(propertyId);
129
130 if (listenerList == null) {
131 listenerList = new ArrayList (1);
132 listeners.put(propertyId, listenerList);
133 }
134
135 if (!listenerList.contains(newListener)) {
136 listenerList.add(newListener);
137 }
138 }
139
140 public void add(String [] propertyIds, IPropertyMapListener newListener) {
141 for (int i = 0; i < propertyIds.length; i++) {
142 String id = propertyIds[i];
143
144 addInternal(id, newListener);
145 }
146 newListener.listenerAttached();
147 }
148
149 public void remove(String propertyId, IPropertyMapListener toRemove) {
150 if (listeners == null) {
151 return;
152 }
153 List listenerList = (List )listeners.get(propertyId);
154
155 if (listenerList != null) {
156 listenerList.remove(toRemove);
157
158 if (listenerList.isEmpty()) {
159 listeners.remove(propertyId);
160
161 if (listeners.isEmpty()) {
162 listeners = null;
163 }
164 }
165 }
166 }
167
168 public void removeAll() {
169 globalListeners = null;
170 listeners = null;
171 }
172
173 public void remove(IPropertyMapListener toRemove) {
174 if (globalListeners != null) {
175 globalListeners.remove(toRemove);
176 if (globalListeners.isEmpty()) {
177 globalListeners = null;
178 }
179 }
180
181 if (listeners != null) {
182 for (Iterator iter = listeners.keySet().iterator(); iter.hasNext();) {
183 String key = (String ) iter.next();
184
185 remove(key, toRemove);
186 }
187 }
188 }
189
190 public boolean isEmpty() {
191 return globalListeners == null && listeners == null;
192 }
193 }
194 |
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