org.apache.jetspeed.portlet.event
Class ActionAdapter

java.lang.Object
  |
  +--org.apache.jetspeed.portlet.event.ActionAdapter

All Implemented Interfaces:

ActionListener

public abstract class ActionAdapter

extends Object

implements ActionListener

The ActionAdapter is an action listener in which all callback methods are empty implementations. The action adapter makes it more convenient for an object to listen for action events. In particular, by using the action adapter, it is possible to implement only those callback methods in which you are interested. Without the action adapter, you must implement all callback methods, even if the method is empty.

At this stage, this may sound like overkill since the action listener only defines one method. The adapter therefore only provides a default implementation for a method you are going override anyway. But to ensure backward compatibility in future release, it is recommended to still follow this practice so that you will be able to enjoy functionality in future releases without having to go back to all your listener code.

To use the action adapter, you create a subclass of ActionAdapter and override the desired callback methods. You then create an instance of the action adapter subclass and use it to register it as a listener for action events.

See Also:

ActionEvent

Constructor Summary

ActionAdapter()

Method Summary

void	actionPerformed(ActionEvent event) Notifies this listener that the action which the listener is watching for has been performed.

Methods inherited from class java.lang.Object

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

Constructor Detail

ActionAdapter

public ActionAdapter()

Method Detail

actionPerformed

public void actionPerformed(ActionEvent event)

Description copied from interface: ActionListener

Notifies this listener that the action which the listener is watching for has been performed.

Specified by:

actionPerformed in interface ActionListener

Following copied from interface: org.apache.jetspeed.portlet.event.ActionListener

Parameters:

event - the action event