AbstractGraphModel


1   package JSci.awt;
2   
3   import javax.swing.event.EventListenerList  ;
4   
5   /**
6   * The AbstractGraphModel class handles the dispatching of
7   * GraphDataEvents to interested listeners.
8   * @version 1.2
9   * @author Mark Hale
10  */
11  public abstract class AbstractGraphModel extends Object   {
12          private final EventListenerList   listenerList = new EventListenerList  ();
13          private final GraphDataEvent dataChangedEvent = new GraphDataEvent(this);
14  
15          /**
16          * Notifies all listeners that the graph data may have changed.
17          */
18          protected final void fireGraphDataChanged() {
19                  fireGraphChanged(dataChangedEvent);
20          }
21          /**
22          * Notifies all listeners that a series may have changed.
23          */
24          protected final void fireGraphSeriesUpdated(int series) {
25                  final GraphDataEvent event = new GraphDataEvent(this, series);
26                  fireGraphChanged(event);
27          }
28          /**
29          * Notifies all listeners of a given graph data event.
30          */
31          protected final void fireGraphChanged(GraphDataEvent event) {
32                  final Object   listeners[] = listenerList.getListenerList();
33                  for(int i=listeners.length-2; i>=0; i-=2) {
34                          if(listeners[i] == GraphDataListener.class)
35                                  ((GraphDataListener)listeners[i+1]).dataChanged(event);
36                  }
37          }
38          /**
39          * Adds a listener to the list that's notified each time a change to the graph data occurs.
40          */
41          public final void addGraphDataListener(GraphDataListener l) {
42                  listenerList.add(GraphDataListener.class, l);
43          }
44          /**
45          * Removes a listener from the list that's notified each time a change to the graph data occurs.
46          */
47          public final void removeGraphDataListener(GraphDataListener l) {
48                  listenerList.remove(GraphDataListener.class, l);
49          }
50  }
51  
52
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