actionadapter.java

来自「jetspeed源代码」· Java 代码 · 共 91 行

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package org.apache.jetspeed.portlet.event;

/**
 * The <CODE>ActionAdapter</CODE> 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.
 * 
 * <P>
 * 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.
 * </P>
 * 
 * <P>
 * To use the action adapter, you create a subclass of
 * <CODE>ActionAdapter</CODE> 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.
 * </P>
 * 
 * @author <A HREF="mailto:[e-mail]">Thomas F. Boehme</A>
 * @see ActionEvent
 */
public abstract class ActionAdapter implements ActionListener
{
    public void actionPerformed (ActionEvent event)
    {
    }
}