java code for An example of getting the Accessible information from a Button object

/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// ActionExampleButton.java
//An example of getting the Accessible information from a Button object.
//(You could see this information by attaching an AssistiveExample object
//to the button. See BigExample.java for an example of that attachment.)
//

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Locale;

import javax.accessibility.Accessible;
import javax.accessibility.AccessibleAction;
import javax.accessibility.AccessibleContext;
import javax.accessibility.AccessibleRole;
import javax.accessibility.AccessibleStateSet;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class ActionExample extends Button implements ActionListener, Accessible {

public ActionExample() {
super("Press this Button");
addActionListener(this);
}

public AccessibleContext getAccessibleContext() {
return (new ActionAccessibleContext());
}

public void actionPerformed(ActionEvent e) {
System.out.println("The button was pressed!");
}

public void processActionEvent(ActionEvent e) {
super.processActionEvent(e);
}

// This class contains the accessible context for the component. Many
// abstract methods simply call the SwingUtilities class to get the job
// done; this is advised if you can get away with it. Otherwise, see the
// source code for SwingUtilities.
class ActionAccessibleContext extends AccessibleContext {

public ActionAccessibleContext() {
super();
setAccessibleName("Button");
setAccessibleDescription("Press the Button");
}

public AccessibleRole getAccessibleRole() {
// Fill in whatever role you want here
return (AccessibleRole.AWT_COMPONENT);
}

public AccessibleStateSet getAccessibleStateSet() {
return SwingUtilities.getAccessibleStateSet(ActionExample.this);
}

public int getAccessibleIndexInParent() {
return SwingUtilities
.getAccessibleIndexInParent(ActionExample.this);
}

public int getAccessibleChildrenCount() {
return SwingUtilities
.getAccessibleChildrenCount(ActionExample.this);
}

public Accessible getAccessibleChild(int i) {
return SwingUtilities.getAccessibleChild(ActionExample.this, i);
}

public Locale getLocale() {
// Ask the component what its locale is
return ActionExample.this.getLocale();
}

public AccessibleAction getAccessibleAction() {
return new AccessAction();
}
}

// This class implements the AccessibleAction interface. Essentially, there
// is only one action that is the equivalent of pushing the button.
class AccessAction implements AccessibleAction {

final int NUMBER_OF_ACTIONS = 1;

final String DESCRIPTION = "Presses the button";

public int getAccessibleActionCount() {
return NUMBER_OF_ACTIONS;
}

public String getAccessibleActionDescription(int i) {
if (i == 0)
return (DESCRIPTION);
else
return null;
}

public boolean doAccessibleAction(int i) {
if (i == 0) {
// Simulate pressing a button
ActionExample.this.processActionEvent(new ActionEvent(this,
ActionEvent.ACTION_PERFORMED, ActionExample.this
.getActionCommand()));
return true;
} else
return false;
}
}

public static void main(String s[]) {

ActionExample example = new ActionExample();

JFrame frame = new JFrame("AccessibleAction Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(example, BorderLayout.CENTER);
frame.setSize(100, 100);
frame.setVisible(true);
}
}