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1
17 package org.eclipse.emf.common.notify.impl;
18
19
20 import java.util.Collection  ;
21
22 import org.eclipse.emf.common.notify.Adapter;
23 import org.eclipse.emf.common.notify.Notification;
24 import org.eclipse.emf.common.notify.Notifier;
25 import org.eclipse.emf.common.util.BasicEList;
26 import org.eclipse.emf.common.util.ECollections;
27 import org.eclipse.emf.common.util.EList;
28
29
30
33 public class BasicNotifierImpl implements Notifier
34 {
35
38 public BasicNotifierImpl()
39 {
40 }
41
42 public static class EAdapterList extends BasicEList
43 {
44 protected Notifier notifier;
45
46 public EAdapterList(Notifier notifier)
47 {
48 this.notifier = notifier;
49 }
50
51 protected boolean safe;
52
53 protected boolean canContainNull()
54 {
55 return false;
56 }
57
58 protected boolean useEquals()
59 {
60 return false;
61 }
62
63 protected Object [] newData(int capacity)
64 {
65 return new Adapter [capacity];
66 }
67
68 protected void didAdd(int index, Object newObject)
69 {
70 Adapter adapter = (Adapter)newObject;
71 adapter.setTarget(notifier);
72 }
73
74 protected void didRemove(int index, Object oldObject)
75 {
76 Adapter adapter = (Adapter)oldObject;
77 if (notifier.eDeliver())
78 {
79 Notification notification =
80 new NotificationImpl(Notification.REMOVING_ADAPTER, oldObject, null, index)
81 {
82 public Object getNotifier()
83 {
84 return notifier;
85 }
86 };
87 adapter.notifyChanged(notification);
88 }
89 if (adapter instanceof Adapter.Internal)
90 {
91 ((Adapter.Internal)adapter).unsetTarget(notifier);
92 }
93 else if (adapter.getTarget() == notifier)
94 {
95 adapter.setTarget(null);
96 }
97 }
98
99 public Object [] data()
100 {
101 safe = true;
102 return (Adapter [])data;
103 }
104
105 protected void ensureSafety()
106 {
107 if (safe && data != null)
108 {
109 Object [] oldData = data;
110 data = newData(data.length);
111 System.arraycopy(oldData, 0, data, 0, size);
112 safe = false;
113 }
114 }
115
116 public boolean add(Object object)
117 {
118 ensureSafety();
119 return super.add(object);
120 }
121
122 public void add(int index, Object object)
123 {
124 ensureSafety();
125 super.add(index, object);
126 }
127
128 public boolean addAll(Collection collection)
129 {
130 ensureSafety();
131 return super.addAll(collection);
132 }
133
134 public boolean remove(Object object)
135 {
136 ensureSafety();
137 return super.remove(object);
138 }
139
140 public Object remove(int index)
141 {
142 ensureSafety();
143 return super.remove(index);
144 }
145
146 public boolean removeAll(Collection collection)
147 {
148 ensureSafety();
149 return super.removeAll(collection);
150 }
151
152 public void clear()
153 {
154 ensureSafety();
155 super.clear();
156 }
157
158 public boolean retainAll(Collection collection)
159 {
160 ensureSafety();
161 return super.retainAll(collection);
162 }
163
164 public Object set(int index, Object object)
165 {
166 ensureSafety();
167 return super.set(index, object);
168 }
169
170 public void move(int newPosition, Object object)
171 {
172 ensureSafety();
173 super.move(newPosition, object);
174 }
175
176 public Object move(int newPosition, int oldPosition)
177 {
178 ensureSafety();
179 return super.move(newPosition, oldPosition);
180 }
181 }
182
183
186 public EList eAdapters()
187 {
188 return ECollections.EMPTY_ELIST;
189 }
190
191
195 protected BasicEList eBasicAdapters()
196 {
197 return null;
198 }
199
200
203 public boolean eDeliver()
204 {
205 return false;
206 }
207
208
211 public void eSetDeliver(boolean deliver)
212 {
213 throw new UnsupportedOperationException ();
214 }
215
216
219 public void eNotify(Notification notification)
220 {
221 if (eDeliver() && eBasicAdapters() != null)
222 {
223 int size = eBasicAdapters().size();
224 if (size > 0)
225 {
226 Adapter [] adapters = (Adapter [])eBasicAdapters().data();
227 for (int i = 0; i < size; ++i)
228 {
229 adapters[i].notifyChanged(notification);
230 }
231 }
232 }
233 }
234
235
241 public boolean eNotificationRequired()
242 {
243 BasicEList eAdapters = eBasicAdapters();
244 return eAdapters != null && eDeliver() && !eAdapters.isEmpty();
245 }
246 }
247 |
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