javax.swing.event
Class SwingPropertyChangeSupport

java.lang.Object
  java.beans.PropertyChangeSupport
      javax.swing.event.SwingPropertyChangeSupport

All Implemented Interfaces:

Serializable

public final class SwingPropertyChangeSupport

extends PropertyChangeSupport

This subclass of java.beans.PropertyChangeSupport is identical in functionality -- it sacrifices thread-safety (not a Swing concern) for reduce memory consumption, which helps performance (both big Swing concerns). Most of the overridden methods are only necessary because all of PropertyChangeSupport's instance data is private, without accessor methods.

Constructor Summary
SwingPropertyChangeSupport ( Object  sourceBean)           Constructs a SwingPropertyChangeSupport object.

 

Method Summary
void	addPropertyChangeListener ( PropertyChangeListener           Add a PropertyChangeListener to the listener list.
void	addPropertyChangeListener ( String  propertyName, PropertyChangeListener           Add a PropertyChangeListener for a specific property.
void	firePropertyChange ( PropertyChangeEvent           Fire an existing PropertyChangeEvent to any registered listeners.
void	firePropertyChange ( String  propertyName, Object  oldValue, Object           Report a bound property update to any registered listeners.
PropertyChangeListener	getPropertyChangeListeners ()           Returns an array of all the listeners that were added to the SwingPropertyChangeSupport object with addPropertyChangeListener().
PropertyChangeListener	getPropertyChangeListeners ( String           Returns an array of all the listeners which have been associated with the named property.
boolean	hasListeners ( String           Check if there are any listeners for a specific property.
void	removePropertyChangeListener ( PropertyChangeListener           Remove a PropertyChangeListener from the listener list.
void	removePropertyChangeListener ( String  propertyName, PropertyChangeListener           Remove a PropertyChangeListener for a specific property.

 

Methods inherited from class java.beans. PropertyChangeSupport
addPropertyChangeListener , addPropertyChangeListener , fireIndexedPropertyChange , fireIndexedPropertyChange , fireIndexedPropertyChange , firePropertyChange , firePropertyChange , firePropertyChange , firePropertyChange , getPropertyChangeListeners , getPropertyChangeListeners , hasListeners , removePropertyChangeListener , removePropertyChangeListener
firePropertyChange , firePropertyChange

 

Methods inherited from class java.lang. Object
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait

 

Constructor Detail

SwingPropertyChangeSupport

public SwingPropertyChangeSupport(Object sourceBean)

Constructs a SwingPropertyChangeSupport 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.

Overrides:

addPropertyChangeListener in class PropertyChangeSupport

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.

Overrides:

removePropertyChangeListener in class PropertyChangeSupport

Parameters:

listener - The PropertyChangeListener to be removed

getPropertyChangeListeners

 
public PropertyChangeListener[] getPropertyChangeListeners () 

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

If some listeners have been added with a named property, then the returned array will be a mixture of PropertyChangeListeners and PropertyChangeListenerProxys. If the calling method is interested in distinguishing the listeners then it must test each element to see if it's a PropertyChangeListenerProxy perform the cast and examine the parameter.

 PropertyChangeListener[] listeners = support.getPropertyChangeListeners();
 for (int i = 0; i < listeners.length; i++) {
	 if (listeners[i] instanceof PropertyChangeListenerProxy) {
     PropertyChangeListenerProxy proxy = 
                    (PropertyChangeListenerProxy)listeners[i];
     if (proxy.getPropertyName().equals("foo")) {
       // proxy is a PropertyChangeListener which was associated
       // with the property named "foo"
     }
   }
 }

Overrides:

getPropertyChangeListeners in class PropertyChangeSupport

Returns:

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

Since:

1.4

See Also:

PropertyChangeListenerProxy , PropertyChangeSupport.getPropertyChangeListeners()

addPropertyChangeListener

 
public void addPropertyChangeListener ( String propertyName,
 PropertyChangeListener listener) 

Add a PropertyChangeListener for a specific property. The listener will be invoked only when a call on firePropertyChange names that specific property.

Overrides:

addPropertyChangeListener in class PropertyChangeSupport

Parameters:

propertyName - The name of the property to listen on.

listener - The PropertyChangeListener to be added

removePropertyChangeListener

 
public void removePropertyChangeListener ( String propertyName,
 PropertyChangeListener listener) 

Remove a PropertyChangeListener for a specific property.

Overrides:

removePropertyChangeListener in class PropertyChangeSupport

Parameters:

propertyName - The name of the property that was listened on.

listener - The PropertyChangeListener to be removed

getPropertyChangeListeners

 
public PropertyChangeListener[] getPropertyChangeListeners ( String propertyName) 

Returns an array of all the listeners which have been associated with the named property.

Overrides:

getPropertyChangeListeners in class PropertyChangeSupport

Returns:

all of the PropertyChangeListeners associated with the named property or an empty array if no listeners have been added

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.

Overrides:

firePropertyChange in class PropertyChangeSupport

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.

firePropertyChange

 
public void firePropertyChange ( PropertyChangeEvent evt) 

Fire an existing PropertyChangeEvent to any registered listeners. No event is fired if the given event's old and new values are equal and non-null.

Overrides:

firePropertyChange in class PropertyChangeSupport

Parameters:

evt - The PropertyChangeEvent object.

hasListeners

 
public boolean hasListeners ( String propertyName) 

Check if there are any listeners for a specific property.

Overrides:

hasListeners in class PropertyChangeSupport

Parameters:

propertyName - the property name.

Returns:

true if there are ore or more listeners for the given property