Name: sdR10048 Date: 04/16/2001


public PropertyChangeListener[] javax.swing.event.getPropertyChangeListeners()
throws ArrayStoreException if some PropertyChangeListeners have been
added previously. See example:
--------------------------------------------------
[archer] ~/tmp
% cat test.java
import java.beans.*;
import javax.swing.event.*;

class FakePropertyChangeAdapter implements PropertyChangeListener{
    public void propertyChange(PropertyChangeEvent evt){};
}

public class test {
    public static void main(String[] args) {
        SwingPropertyChangeSupport pcs = new
            SwingPropertyChangeSupport("the thing");
        pcs.addPropertyChangeListener(new FakePropertyChangeAdapter());
        pcs.getPropertyChangeListeners();
    }
}

[archer] ~/tmp
% java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b58)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b58, mixed mode)

[archer] ~/tmp
% java test
Exception in thread "main" java.lang.ArrayStoreException
        at java.lang.System.arraycopy(Native Method)
        at java.util.ArrayList.toArray(ArrayList.java:293)
        at javax.swing.event.SwingPropertyChangeSupport.getPropertyChangeListeners(SwingProp
ertyChangeSupport.java:150)
        at test.main(test.java:13)
--------------------------------------------------
Javadoc says:

public PropertyChangeListener[] getPropertyChangeListeners()

    Returns an array of all the listeners that were added to the SwingPropertyChangeSupport
    object with addPropertyChangeListener().

    If some listeners have been added with a named property, then the returned array will be a
    mixture of PropertyChangeListeners and PropertyChangeListenerProxys. If
    the calling method is interested in distinguishing the listeners then it must test each element to
    see if it's a PropertyChangeListenerProxy perform the cast and examine the
    parameter.

     PropertyChangeListener[] listeners = support.getPropertyChangeListeners();
     for (int i = 0; i < listeners.length; i++) {
             if (listeners[i] instanceof PropertyChangeListenerProxy) {
         PropertyChangeListenerProxy proxy =
                        (PropertyChangeListenerProxy)listeners[i];
         if (proxy.getPropertyName().equals("foo")) {
           // proxy is a PropertyChangeListener which was associated
           // with the property named "foo"
         }
       }
     }

    Overrides:
        getPropertyChangeListeners in class
        PropertyChangeSupport
    Returns:
        all of the PropertyChangeListeners added or an empty array if no listeners
        have been added
    Since:
        1.4
    See Also:
        PropertyChangeListenerProxy,
        PropertyChangeSupport.getPropertyChangeListeners()

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