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54
55 package org.apache.jetspeed.portlet.event;
56
57 /**
58  * The <CODE>ActionAdapter</CODE> is an action listener in which all
59  * callback methods are empty implementations. The action adapter makes
60  * it more convenient for an object to listen for action events.
61  * In particular, by using the action adapter, it is possible to
62  * implement only those callback methods in which you are interested.
63  * Without the action adapter, you must implement all callback methods,
64  * even if the method is empty.
65  *
66  * <P>
67  * At this stage, this may sound like overkill since the action listener
68  * only defines one method. The adapter therefore only provides a default
69  * implementation for a method you are going override anyway. But to
70  * ensure backward compatibility in future release, it is recommended to
71  * still follow this practice so that you will be able to enjoy
72  * functionality in future releases without having to go back to all your
73  * listener code.
74  * </P>
75  *
76  * <P>
77  * To use the action adapter, you create a subclass of
78  * <CODE>ActionAdapter</CODE> and override the desired callback methods.
79  * You then create an instance of the action adapter subclass and use it
80  * to register it as a listener for action events.
81  * </P>
82  *
83  * @author <A HREF="mailto:tboehme@us.ibm.com">Thomas F. Boehme</A>
84  * @see ActionEvent
85  */
86 public abstract class ActionAdapter implements ActionListener
87 {
88     public void actionPerformed (ActionEvent event)
89     {
90     }
91 }
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