How to detect the end of input in Jsch? - swing

Question

I'm using Jsch in my program.
I'd like to display a directory that an user currently working on.
So, instead of displaying uid, I would like to show a directory such as, "[/home/user/abc] <user command input>".
My idea on this is sending pwd after every command from an user and parsing the output. But the problem is that I don't know how to parse it from inputstream. How to determine the input boundary between pwd and a user command?
public class TextFieldStreamer extends InputStream implements ActionListener
{
private JTextField tf;
private String str = null;
private int pos = 0;
private boolean finish = false;
public TextFieldStreamer(JTextField jtf)
{
tf = jtf;
}
public void close()
{
finish = true;
try
{
super.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
// gets triggered everytime that "Enter" is pressed on the textfield
public void actionPerformed(ActionEvent e)
{
enterAction();
}
public void enterAction()
{
str = tf.getText();
str += "\n";
pos = 0;
}
#Override
public int read()
{
// test if the available input has reached its end
// and the EOS should be returned
if (str != null && pos == str.length())
{
str = null;
// this is supposed to return -1 on "end of stream"
// but I'm having a hard time locating the constant
return java.io.StreamTokenizer.TT_EOF;
}
while (!finish && (str == null || pos >= str.length()))
{
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
return str.charAt(pos++);
}
}
　
public class TextAreaOutputStream extends OutputStream
{
JTextArea textArea;
public TextAreaOutputStream(JTextArea textArea)
{
this.textArea = textArea;
}
public void write(int b) throws IOException
{
write(new byte[] { (byte) b }, 0, 1);
}
public void write(byte[] b, int off, int len) throws IOException
{
final String text = new String(b, off, len, "UTF-8");
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
textArea.append(text);
}
});
}
}