/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2003-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
* Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
*
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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package org.jruby.javasupport.bsf;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import org.apache.bsf.BSFException;
import org.apache.bsf.BSFManager;
/** An example demonstrating the use of JRuby and BSF.
*
*/
public class BSFExample {
private BSFManager manager;
public static void main(String[] args) {
/*
* First we need to register the JRuby engine.
*/
BSFManager.registerScriptingEngine("ruby", "org.jruby.javasupport.bsf.JRubyEngine", new String[] { "rb" });
/*
* Now we create a new BSFManager.
*/
new BSFExample(new BSFManager());
}
public BSFExample(BSFManager manager) {
this.manager = manager;
/*
* Initialize a simple Frame.
*/
initUI();
}
private void initUI() {
/*
* Initialize some components.
*/
final JFrame frame = new JFrame("A sample BSF application");
final JMenuBar menubar = new JMenuBar();
final JTextArea input = new JTextArea("$frame.setTitle(\"A new title\")");
final JButton execute = new JButton("Execute");
final JButton eval = new JButton("Eval");
try {
/*
* Declare those components as beans in BSF. Then it will be
* possible to access those components in Ruby as global
* variables ($frame, $menubar, ...)
*/
manager.declareBean("frame", frame, JFrame.class);
manager.declareBean("menubar", menubar, JMenuBar.class);
manager.declareBean("input", input, JTextArea.class);
manager.declareBean("execute", execute, JButton.class);
manager.declareBean("eval", eval, JButton.class);
} catch (BSFException excptn) {
excptn.printStackTrace();
JOptionPane.showMessageDialog(null, excptn.getMessage());
}
frame.getContentPane().setLayout(new BorderLayout(12, 12));
frame.getContentPane().add(input, BorderLayout.CENTER);
JPanel buttonPane = new JPanel(new FlowLayout(12));
frame.getContentPane().add(buttonPane, BorderLayout.SOUTH);
buttonPane.add(execute, BorderLayout.EAST);
buttonPane.add(eval, BorderLayout.EAST);
try {
/*
* Execute a Ruby script (add the menubar to the frame).
*/
manager.exec("ruby", "initUI", 1, 1, "$frame.setJMenuBar($menubar)");
} catch (BSFException excptn) {
excptn.printStackTrace();
JOptionPane.showMessageDialog(null, excptn.getMessage());
}
execute.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
/*
* Execute Ruby statements.
*/
manager.exec("ruby", "initUI", 1, 1, input.getText());
} catch (BSFException excptn) {
excptn.printStackTrace();
JOptionPane.showMessageDialog(frame, excptn.getMessage());
}
}
});
eval.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
/*
* Evaluates a Ruby expression and display the result.
*/
String expression = JOptionPane.showInputDialog(frame, "Please enter a Ruby expression:");
input.setText(String.valueOf(manager.eval("ruby", "initUI", 1, 1, expression)));
} catch (BSFException excptn) {
excptn.printStackTrace();
JOptionPane.showMessageDialog(frame, excptn.getMessage());
}
}
});
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}