Name: sdC67446 Date: 10/01/99


The method
    public EventListener[] getListeners(Class listenerType)
of class
    javax.swing.AbstractListModel
throws ClassCastException if 'listenerType' is not
ListDataListener.class.

The doc says:
--------------------------------------------------
public EventListener[] getListeners(Class listenerType)

      Return an array of all the listeners of the given type that were
      added to this model.
      Since:
            1.3

The demo test:
--------------------------------------------------
import javax.swing.*;
import javax.swing.event.*;

public class Test {

    public static class FakeListDataListener implements ListDataListener {
        public void intervalAdded(ListDataEvent event) {}
        public void intervalRemoved(ListDataEvent event) {}
        public void contentsChanged(ListDataEvent event) {}
    }

    public static class StubListModel extends AbstractListModel {
        public int getSize() { return 10; }
        public Object getElementAt(int index) { return null; }
        public void fireContentsChanged(Object object, int index0, int index1) {
            super.fireContentsChanged(object,index0,index1);
        }
        public void fireIntervalAdded(Object object, int index0, int index1) {
            super.fireIntervalAdded(object,index0,index1);
        }
        public void fireIntervalRemoved(Object object, int index0, int index1) {
            super.fireIntervalRemoved(object,index0,index1);
        }
    }

    public static void main(String argv[]) {
        StubListModel model = new StubListModel();
        FakeListDataListener l = new FakeListDataListener();
        try {
            System.out.println("1");
            model.addListDataListener(l);
            model.getListeners(ListDataListener.class);
            System.out.println("OK");
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            System.out.println("2");
            model.addListDataListener(l);
            model.getListeners(Integer.class);
            System.out.println("OK");
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            System.out.println("3");
            model.addListDataListener(l);
            model.getListeners(StubListModel.class);
            System.out.println("OK");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Output:
--------------------------------------------------
1
OK
2
java.lang.ClassCastException: [Ljava.lang.Integer;
        at javax.swing.event.EventListenerList.getListeners(EventListenerList.java:124)
        at javax.swing.AbstractListModel.getListeners(AbstractListModel.java:156)
        at Test.main(Test.java:40)
3
java.lang.ClassCastException: [LTest$StubListModel;
        at javax.swing.event.EventListenerList.getListeners(EventListenerList.java:124)
        at javax.swing.AbstractListModel.getListeners(AbstractListModel.java:156)
        at Test.main(Test.java:48)

--------------------------------------------------
======================================================================

Name: sdC67446 Date: 10/12/99


The same problem:

1) in javax.swing.DefaultBoundedRangeModel

   The method public EventListener[] getListeners(Class listenerType)
   of class javax.swing.DefaultBoundedRangeModel
   throws ClassCastException if 'listenerType' is not
   ChangeListener.class.

2) in javax.swing.DefaultListSelectionModel

   The method public EventListener[] getListeners(Class listenerType)
   of class javax.swing.DefaultListSelectionModel
   throws ClassCastException if 'listenerType' is not
   ListSelectionListener.class.

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