Implementing a Constrained Property
A constrained property fires a PropertyChangeEvent whenever its
value is about to be changed. Any listener can veto the event,
thereby preventing the change. This example bean implements a single
constrained integer property called myProperty.
int myProperty;
public int getMyProperty() {
return myProperty;
}
public void setMyProperty(int newValue) throws PropertyVetoException {
try {
vceListeners.fireVetoableChange(
"myProperty", new Integer(myProperty), new Integer(newValue));
myProperty = newValue;
} catch (PropertyVetoException e) {
throw e;
}
}
// Create the listener list.
VetoableChangeSupport vceListeners = new VetoableChangeSupport(this);
// The listener list wrapper methods.
public synchronized void addVetoableChangeListener(VetoableChangeListener listener) {
vceListeners.addVetoableChangeListener(listener);
}
public synchronized void removeVetoableChangeListener(VetoableChangeListener listener) {
vceListeners.removeVetoableChangeListener(listener);
}
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