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1 package rero.client;
2
3 import javax.swing.event.*;
4 import java.util.*;
5
6 import java.lang.ref.*;
7
8 public class WatchableData
9 {
10 protected LinkedList listeners;
11 protected ChangeEvent eventObject;
12
13 public WatchableData()
14 {
15 listeners = new LinkedList();
16 eventObject = new ChangeEvent(this);
17 }
18
19 public void addChangeListener(ChangeListener l)
20 {
21 listeners.add(new WeakReference(l));
22 }
23
24 public void removeChangeListener(ChangeListener l)
25 {
26 listeners.remove(l);
27 }
28
29 public void fireEvent()
30 {
31 ListIterator i = listeners.listIterator();
32 while (i.hasNext())
33 {
34 ChangeListener temp = (ChangeListener)(((WeakReference)i.next()).get());
35
36 if (temp == null)
37 i.remove();
38 else
39 temp.stateChanged(eventObject);
40 }
41 }
42 }
43 |
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