import java.awt.*;
import java.io.*;
import java.awt.print.*;

import javax.imageio.*;

public class HeadlessBasics
{
    public static void main(String[] args)
    {
        // set system property
        // call this BEFORE the toolkit has been initialized, that is
        //     before Toolkit.getDefaultToolkit() has been called
        System.setProperty("java.awt.headless", "true");

        // this triggers toolkit creation
        // as java.awt.headless property is set to true, this will be
        //     an instance of headless toolkit
        Toolkit tk = Toolkit.getDefaultToolkit();
        // standard beep is available
        tk.beep();

        // use this to check if we run in the headless mode
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        System.out.println("Headless mode: " + ge.isHeadless());

        // no toplevels are allowed
        boolean created = false;
        try
        {
            Frame f = new Frame("Frame");
            created = true;
        }
        catch (Exception z)
        {
            z.printStackTrace(System.err);
            created = false;
        }
        System.err.println("Frame is created: " + created);

        // no other components except canvas and panel are allowed
        created = false;
        try
        {
            Button b = new Button("Button");
            created = true;
        }
        catch (Exception z)
        {
            z.printStackTrace(System.err);
            created = false;
        }
        System.err.println("Button is created: " + created);
        
        // canvases can be created
        final Canvas c = new Canvas()
        {
            public void paint(Graphics g)
            {
                Rectangle r = getBounds();
                g.drawLine(0, 0, r.width - 1, r.height - 1);
                // colors work too
                g.setColor(new Color(255, 127, 0));
                g.drawLine(0, r.height - 1, r.width - 1, 0);
                // and fonts
                g.setFont(new Font("Arial", Font.ITALIC, 12));
                g.drawString("Test", 32, 8);
            }
        };
        // and all the operations work correctly
        c.setBounds(32, 32, 128, 128);

        // images are available
        Image i = null;
        try
        {
            File f = new File("grapefruit.jpg");
            i = ImageIO.read(f);
        }
        catch (Exception z)
        {
            z.printStackTrace(System.err);
        }
        final Image im = i;
        
        // print system is available
        PrinterJob pj = PrinterJob.getPrinterJob();
        pj.setPrintable(new Printable()
        {
            public int print(Graphics g, PageFormat pf, int pageIndex)
            {
                if (pageIndex > 0)
                {
                    return Printable.NO_SUCH_PAGE;
                }

                ((Graphics2D)g).translate(pf.getImageableX(), pf.getImageableY());

                // paint canvas
                c.paint(g);

                // paint image
                if (im != null)
                {
                    g.drawImage(im, 32, 32, 64, 64, null);
                }

                return Printable.PAGE_EXISTS;
            }
        });
        try
        {
            pj.print();
        }
        catch (Exception z)
        {
            z.printStackTrace(System.err);
        }
    }
}