Context-changes

gistfile1.java

public class BarCodeUploaderApplet extends Applet {
    final String fileName = "C:\\A\\b.dat";
    final String backFileName = "C:\\A\\b.old.dat";
    
    public Boolean fileExists() {
        final Result<Boolean> result = new Result<>(false);
        final JSObject win = (JSObject) JSObject.getWindow(this);
        run(new Runnable() {

            @Override
            public void run() {
                try
                {
                    result.SetValue(new File(fileName).exists());
                } catch (Throwable e)
                {
                    win.eval("alert('Feil under lesing av fil, feilmelding: " + e.getMessage().replaceAll("'", "\'") + "');");
                }
            }
            
        });
        return result.GetValue();
    }
    
    public String getContent() {
        final Result<String> result = new Result<>(null);
        final JSObject win = (JSObject) JSObject.getWindow(this);
        run(new Runnable() {
            @Override
            public void run() {
                FileInputStream stream = null;
                try {
                    stream = new FileInputStream(new File(fileName));
                    FileChannel fc = stream.getChannel();
                    MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
                    /* Instead of using default, pass in a decoder. */
                    result.SetValue(Charset.defaultCharset().decode(bb).toString());
                } catch (IOException e) {
                    win.eval("alert('Feil under lesing av fil, feilmelding: " + e.getMessage().replaceAll("'", "\'") + "');");
                } finally {
                    try {
                        if(stream != null)
                            stream.close();
                    } catch (Throwable e) {
                        /* ignore */
                    }
                }
            }
        });
        return result.GetValue();
    }
    
    public void archive() {
        run(new Runnable() {

            @Override
            public void run() {
                File b = new File(backFileName);
                if(b.exists())
                    b.delete();
                new File(fileName).renameTo(b);
            }
            
        });
    }

    private void run(final Runnable runnable) {
        final ManualResetEvent m = new ManualResetEvent(false);
        final JSObject win = (JSObject) JSObject.getWindow(this);
        final javax.swing.Timer timer = new javax.swing.Timer(10, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {
                AccessController.doPrivileged(new PrivilegedAction() {

                    @Override
                    public Object run() {
                        runnable.run();
                        return null;
                    }
                    
                });
                m.set();
                if(ae.getSource().getClass() == javax.swing.Timer.class)
                    ((javax.swing.Timer)ae.getSource()).stop();
            }
            
        });
        timer.setRepeats(false);
        timer.start();
        try {
            m.waitOne(5000, TimeUnit.MILLISECONDS);
        } catch (InterruptedException ex) {
            /* ignore */
        }
    }
}