org.eodisp.ui.common.base
Class EodispDelegate

java.lang.Object
  org.eodisp.ui.common.base.EodispDelegate

All Implemented Interfaces:

java.awt.event.ActionListener, java.util.EventListener

public class EodispDelegate
extends java.lang.Object
implements java.awt.event.ActionListener

This is an implementation of a delegate. It is capable of delegating the execution of a method to the registered method within the target class. It can be used as a delegation mechanism for virtually anything where an ActionListener is suitable.

For instance, it can be used by a controller to register itself as a handler for an action. The example here assumes that you want to register the event 'OnAppExit' in the application controller. The following has to be done:

• Create an action class 'ExitAppAction'
• Instantiate this action in the appropriate frame. In the case of the application controller, this will be the main frame of the application. In general, it is the frame which the controller is responsible for.
• Register the controller as the action handler for the event.
• Create a method 'OnAppExit' in the controller that handles the event.

The corresponding code in the controller would look like this:

 
                Frame.onAppExitAction.registerTargetHandler(new EodispDelegate(this, "onAppExit"));
                public void OnAppExit(ActionEvent e) {
                        //implementation
                }
 
 

Version:

$Id:EodispDelegate.java 2047 2006-05-09 12:20:54Z eglimi $

Author:

eglimi

Field Summary

(package private) static org.apache.log4j.Logger

logger Log4J logger for this class

Constructor Summary

EodispDelegate(java.lang.Object target, java.lang.String methodString)
Default constructor.

Method Summary

void	actionPerformed(java.awt.event.ActionEvent e) Called when an action is performed.

Methods inherited from class java.lang.Object

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

Field Detail

logger

static org.apache.log4j.Logger logger

Log4J logger for this class

Constructor Detail

EodispDelegate

public EodispDelegate(java.lang.Object target,
                      java.lang.String methodString)

Default constructor. Finds the method on the target object to be called.

Parameters:

target - The target object that is responsible to act upon the action performed event.

methodString - The name of the method that should be invoked when by the action performed event.

Method Detail

actionPerformed

public void actionPerformed(java.awt.event.ActionEvent e)

Called when an action is performed. It invokes the specified method in the target object.

Specified by:

actionPerformed in interface java.awt.event.ActionListener

Parameters:

e - ActionEvent - the event object of the event