question: protected final void fireVetoableChange ( PropertyChangeEvent event ) throws PropertyVetoException { VetoableChangeSupport aVetoSupport = this . vetoSupport ; if ( aVetoSupport == null ) { return ; } aVetoSupport . fireVetoableChange ( event ) ; }
target:  General support for reporting constrained property changes. Sends the given PropertyChangeEvent to any registered PropertyChangeListener.<p> Most bean setters will invoke the fireXXX methods that get a property name and the old and new value. However some frameworks and setters may prefer to use this general method. Also, this method allows to fire IndexedPropertyChangeEvents that have been introduced in Java 5.