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28 import java.util.EventListenerProxy;
31 * A class which extends the {@code EventListenerProxy}
32 * specifically for adding a {@code VetoableChangeListener}
33 * with a "constrained" property.
34 * Instances of this class can be added
35 * as {@code VetoableChangeListener}s to a bean
36 * which supports firing vetoable change events.
38 * If the object has a {@code getVetoableChangeListeners} method
39 * then the array returned could be a mixture of {@code VetoableChangeListener}
40 * and {@code VetoableChangeListenerProxy} objects.
42 * @see java.util.EventListenerProxy
43 * @see VetoableChangeSupport#getVetoableChangeListeners
46 public class VetoableChangeListenerProxy
47 extends EventListenerProxy<VetoableChangeListener>
48 implements VetoableChangeListener {
50 private final String propertyName;
53 * Constructor which binds the {@code VetoableChangeListener}
54 * to a specific property.
56 * @param propertyName the name of the property to listen on
57 * @param listener the listener object
59 public VetoableChangeListenerProxy(String propertyName, VetoableChangeListener listener) {
61 this.propertyName = propertyName;
65 * Forwards the property change event to the listener delegate.
67 * @param event the property change event
69 * @exception PropertyVetoException if the recipient wishes the property
70 * change to be rolled back
72 public void vetoableChange(PropertyChangeEvent event) throws PropertyVetoException{
73 getListener().vetoableChange(event);
77 * Returns the name of the named property associated with the listener.
79 * @return the name of the named property associated with the listener
81 public String getPropertyName() {
82 return this.propertyName;