org.springframework.binding.value.support
Class PropertyChangeSupport

Show UML class diagram

java.lang.Object
  org.springframework.binding.value.support.PropertyChangeSupport

All Implemented Interfaces:

Serializable

public final class PropertyChangeSupport
extends Object
implements Serializable

Convenience class that provides propertyChange support. Listeners can be (un)registered on specific properties while firing of PropertyChangeEvents is eased.

See Also:

Serialized Form

Constructor Summary

PropertyChangeSupport(Object sourceBean)
Constructs a SwingPropertyChangeSupport object.

Method Summary

void	addPropertyChangeListener(PropertyChangeListener listener) Add a PropertyChangeListener to the listener list.
void	addPropertyChangeListener(String propertyName, PropertyChangeListener listener) Add a PropertyChangeListener for a specific property.
void	firePropertyChange(PropertyChangeEvent evt) Fire an existing PropertyChangeEvent to any registered listeners.
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 SwingPropertyChangeSupport object with addPropertyChangeListener().
PropertyChangeListener[]	getPropertyChangeListeners(String propertyName) Returns an array of all the listeners which have been associated with the named property.
boolean	hasListeners(String propertyName) Check if there are any listeners for a specific property.
void	removePropertyChangeListener(PropertyChangeListener listener) Remove a PropertyChangeListener from the listener list.
void	removePropertyChangeListener(String propertyName, PropertyChangeListener listener) Remove a PropertyChangeListener for a specific property.

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 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.

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 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"
                }
        }
 }
 

Returns:

all of the PropertyChangeListener s 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.

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.

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.

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.

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.

Parameters:

evt - The PropertyChangeEvent object.

hasListeners

public boolean hasListeners(String propertyName)

Check if there are any listeners for a specific property.

Parameters:

propertyName - the property name.

Returns:

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