java.beans

Class PropertyChangeSupport

java.lang.Object

java.beans.PropertyChangeSupport

All Implemented Interfaces:

Serializable

public class PropertyChangeSupport
extends Object
implements Serializable

This is a utility class that can be used by beans that support bound properties. You can use an instance of this class as a member field of your bean and delegate various work to it. This class is serializable. When it is serialized it will save (and restore) any listeners that are themselves serializable. Any non-serializable listeners will be skipped during serialization.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PropertyChangeSupport(Object sourceBean) Constructs a PropertyChangeSupport object.

Method Summary

Methods

Modifier and Type	Method and Description
void	addPropertyChangeListener(PropertyChangeListener listener) Add a PropertyChangeListener to the listener list.
void	firePropertyChange(String propertyName, Object oldValue, Object newValue) Report a bound property update to any registered listeners.
PropertyChangeListener[]	getPropertyChangeListeners() Returns an array of all the listeners that were added to the PropertyChangeSupport object with addPropertyChangeListener().
void	removePropertyChangeListener(PropertyChangeListener listener) Remove a PropertyChangeListener from the listener list.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PropertyChangeSupport

public PropertyChangeSupport(Object sourceBean)

Constructs a PropertyChangeSupport object.

Parameters:

sourceBean - The bean to be given as the source for any events.

Method Detail

addPropertyChangeListener

public void addPropertyChangeListener(PropertyChangeListener listener)

Add a PropertyChangeListener to the listener list. The listener is registered for all properties.

Parameters:

listener - The PropertyChangeListener to be added

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)

Remove a PropertyChangeListener from the listener list. This removes a PropertyChangeListener that was registered for all properties.

Parameters:

listener - The PropertyChangeListener to be removed

getPropertyChangeListeners

public PropertyChangeListener[] getPropertyChangeListeners()

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

Returns:

all of the PropertyChangeListeners added or an empty array if no listeners have been added

Since:

1.4

firePropertyChange

public void firePropertyChange(String propertyName,
                      Object oldValue,
                      Object newValue)

Report a bound property update to any registered listeners. 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.