1    package j3d.viewer; 
2     
3     
4    import javax.swing.event.TreeModelEvent; 
5    import javax.swing.event.TreeModelListener; 
6    import java.util.Enumeration; 
7    import java.util.Vector; 
8     
9    public class TreeModelSupport { 
10       private Vector vector = new Vector(); 
11    
12       public void addTreeModelListener(TreeModelListener listener) { 
13           if (listener != null && !vector.contains(listener)) { 
14               vector.addElement(listener); 
15           } 
16       } 
17    
18       public void removeTreeModelListener(TreeModelListener listener) { 
19           if (listener != null) { 
20               vector.removeElement(listener); 
21           } 
22       } 
23    
24       public void fireTreeNodesChanged(TreeModelEvent e) { 
25           Enumeration listeners = vector.elements(); 
26           while (listeners.hasMoreElements()) { 
27               TreeModelListener listener = (TreeModelListener) listeners.nextElement(); 
28               listener.treeNodesChanged(e); 
29           } 
30       } 
31    
32       public void fireTreeNodesInserted(TreeModelEvent e) { 
33           Enumeration listeners = vector.elements(); 
34           while (listeners.hasMoreElements()) { 
35               TreeModelListener listener = (TreeModelListener) listeners.nextElement(); 
36               listener.treeNodesInserted(e); 
37           } 
38       } 
39    
40       public void fireTreeNodesRemoved(TreeModelEvent e) { 
41           Enumeration listeners = vector.elements(); 
42           while (listeners.hasMoreElements()) { 
43               TreeModelListener listener = (TreeModelListener) listeners.nextElement(); 
44               listener.treeNodesRemoved(e); 
45           } 
46       } 
47    
48       public void fireTreeStructureChanged(TreeModelEvent e) { 
49           Enumeration listeners = vector.elements(); 
50           while (listeners.hasMoreElements()) { 
51               TreeModelListener listener = (TreeModelListener) listeners.nextElement(); 
52               listener.treeStructureChanged(e); 
53           } 
54       } 
55   } 
56