status.java

The Javatm Telnet Application/Applet 很好用的

/*
 * This file is part of "The Java Telnet Application".
 *
 * (c) Matthias L. Jugel, Marcus Mei遪er 1996-2002. All Rights Reserved.
 *
 * Please visit http://javatelnet.org/ for updates and contact.
 *
 * --LICENSE NOTICE--
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * --LICENSE NOTICE--
 *
 */

package de.mud.jta.plugin;

import de.mud.jta.Plugin;
import de.mud.jta.PluginBus;
import de.mud.jta.PluginConfig;
import de.mud.jta.VisualPlugin;
import de.mud.jta.event.ConfigurationListener;
import de.mud.jta.event.OnlineStatusListener;
import de.mud.jta.event.SocketListener;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JComponent;
import javax.swing.JMenu;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Hashtable;


/**
 * A simple plugin showing the current status of the application whether
 * it is online or not.
 * <P>
 * <B>Maintainer:</B> Matthias L. Jugel
 *
 * @version $Id: Status.java,v 2.9 2002/05/06 07:24:20 leo Exp $
 * @author Matthias L. Jugel, Marcus Mei遪er
 */
public class Status extends Plugin implements VisualPlugin, Runnable {

  private final static int debug = 0;

  private JLabel status;
  private JLabel host;
  private JPanel sPanel;

  private String address, port;

  private String infoURL;
  private int interval;
  private Thread infoThread;

  private Hashtable ports = new Hashtable();

  public Status(PluginBus bus, final String id) {
    super(bus, id);

    // setup the info
    bus.registerPluginListener(new ConfigurationListener() {
      public void setConfiguration(PluginConfig config) {
        infoURL = config.getProperty("Status", id, "info");
        if (infoURL != null)
          host.setAlignmentX(JLabel.CENTER);
        String tmp;
        if ((tmp = config.getProperty("Status", id, "font")) != null) {
          String font = tmp;
          int style = Font.PLAIN, fsize = 12;
          if ((tmp = config.getProperty("Status", id, "fontSize")) != null)
            fsize = Integer.parseInt(tmp);
          String fontStyle = config.getProperty("Status", id, "fontStyle");
          if (fontStyle == null || fontStyle.equals("plain"))
            style = Font.PLAIN;
          else if (fontStyle.equals("bold"))
            style = Font.BOLD;
          else if (fontStyle.equals("italic"))
            style = Font.ITALIC;
          else if (fontStyle.equals("bold+italic"))
            style = Font.BOLD | Font.ITALIC;
          host.setFont(new Font(font, style, fsize));
        }

        if ((tmp = config.getProperty("Status", id, "foreground")) != null)
          host.setForeground(Color.decode(tmp));

        if ((tmp = config.getProperty("Status", id, "background")) != null)
          host.setBackground(Color.decode(tmp));

        if (config.getProperty("Status", id, "interval") != null) {
          try {
            interval = Integer.parseInt(
                    config.getProperty("Status", id, "interval"));
            infoThread = new Thread(Status.this);
            infoThread.start();
          } catch (NumberFormatException e) {
            Status.this.error("interval is not a number");
          }
        }
      }
    });


    // fill port hashtable
    ports.put("22", "ssh");
    ports.put("23", "telnet");
    ports.put("25", "smtp");

    sPanel = new JPanel(new BorderLayout());

    host = new JLabel("Not connected.", JLabel.LEFT);

    bus.registerPluginListener(new SocketListener() {
      public void connect(String addr, int p) {
        address = addr;
        if (address == null || address.length() == 0)
          address = "<unknown host>";
        if (ports.get("" + p) != null)
          port = (String) ports.get("" + p);
        else
          port = "" + p;
        if (infoURL == null)
          host.setText("Trying " + address + " " + port + " ...");
      }

      public void disconnect() {
        if (infoURL == null)
          host.setText("Not connected.");
      }
    });

    sPanel.add("Center", host);

    status = new JLabel("offline", JLabel.CENTER);

    bus.registerPluginListener(new OnlineStatusListener() {
      public void online() {
        status.setText("online");
        status.setForeground(Color.green);
        if (infoURL == null)
          host.setText("Connected to " + address + " " + port);
        status.repaint();
      }

      public void offline() {

        status.setText("offline");
        status.setForeground(Color.red);
        if (infoURL == null)
          host.setText("Not connected.");
        status.repaint();
      }
    });

    sPanel.add("East", status);

  }

  public void run() {
    URL url = null;
    try {
      url = new URL(infoURL);
    } catch (Exception e) {
      error("infoURL is not valid: " + e);
      infoURL = null;
      return;
    }

    while (url != null && infoThread != null) {
      try {
        BufferedReader content =
                new BufferedReader(new InputStreamReader(url.openStream()));
        try {
          String line;
          while ((line = content.readLine()) != null) {
            if (line.startsWith("#")) {
              String color = line.substring(1, 7);
              line = line.substring(8);
              host.setForeground(Color.decode("#" + color));
            }
            host.setText(line);
            infoThread.sleep(10 * interval);
          }
        } catch (IOException e) {
          error("error while loading info ...");
        }
        infoThread.sleep(100 * interval);
      } catch (Exception e) {
        error("error retrieving info content: " + e);
        e.printStackTrace();
        host.setForeground(Color.red);
        host.setText("error retrieving info content");
        infoURL = null;
        return;
      }
    }
  }

  public JComponent getPluginVisual() {
    return sPanel;
  }

  public JMenu getPluginMenu() {
    return null;
  }
}