messageadapter.java

来自「jetspeed源代码」· Java 代码 · 共 92 行

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package org.apache.jetspeed.portlet.event;

/**
 ** The <CODE>MessageAdapter</CODE> is an message listener in which
 ** all callback methods are empty implementations. The message
 ** adapter makes it more convenient for an object to listen for
 ** message events. In particular, by using the message adapter,
 ** it is possible to implement only those callback methods in
 ** which you are interested. Without the Message adapter, you must
 ** implement all callback methods, even if the method is empty.
 **
 ** <P>
 ** At this stage, this may sound like overkill since the message
 ** 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>
 ** To use the message adapter, you create a subclass of
 ** <CODE>MessageAdapter</CODE> and override the desired callback
 ** methods. You then create an instance of the message adapter
 ** subclass and use it to register it as a listener for message
 ** events.
 **
 ** @see   MessageEvent
 **
 ** @author   <A HREF="mailto:[e-mail]">Thomas F. Boehme</A>
 **/

public abstract class MessageAdapter implements MessageListener
{
    public void messageReceived (MessageEvent event)
    {
    }
}