Class java.beans.VetoableChangeSupport - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.beans.VetoableChangeSupport

java.lang.Object
   |
   +----java.beans.VetoableChangeSupport

public class VetoableChangeSupport
extends Object
implements Serializable

This is a utility class that can be used by beans that support constrained properties. You can use an instance of this class as a member field of your bean and delegate various work to it.

VetoableChangeSupport(Object)

addVetoableChangeListener(VetoableChangeListener): Add a VetoableListener to the listener list.
fireVetoableChange(String, Object, Object): Report a vetoable property update to any registered listeners.
removeVetoableChangeListener(VetoableChangeListener): Remove a VetoableChangeListener from the listener list.

VetoableChangeSupport

 public VetoableChangeSupport(Object sourceBean)

addVetoableChangeListener

 public synchronized void addVetoableChangeListener(VetoableChangeListener listener)

Add a VetoableListener to the listener list.

Parameters:: listener - The VetoableChangeListener to be added

removeVetoableChangeListener

 public synchronized void removeVetoableChangeListener(VetoableChangeListener listener)

Remove a VetoableChangeListener from the listener list.

Parameters:: listener - The VetoableChangeListener to be removed

fireVetoableChange

 public void fireVetoableChange(String propertyName,
                                Object oldValue,
                                Object newValue) throws PropertyVetoException

Report a vetoable property update to any registered listeners. If anyone vetos the change, then fire a new event reverting everyone to the old value and then rethrow the PropertyVetoException.

No event is fired if old and new are equal and non-null.

Parameters:: propertyName - The programmatic name of the property that was changed.; oldValue - The old value of the property.; newValue - The new value of the property.
Throws: PropertyVetoException: if the recipient wishes the property change to be rolled back.

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