/* * This file is part of "The Java Telnet Application". * * This 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, or (at your option) * any later version. * * "The Java Telnet Application" 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 software; see the file COPYING.  If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */package de.mud.jta.plugin;import de.mud.jta.Plugin;import de.mud.jta.PluginConfig;import de.mud.jta.FilterPlugin;import de.mud.jta.PluginBus;import de.mud.jta.event.OnlineStatusListener;import de.mud.jta.event.ConfigurationListener;import de.mud.jta.event.TelnetCommandListener;import de.mud.jta.event.TerminalTypeRequest;import de.mud.jta.event.WindowSizeRequest;import de.mud.jta.event.LocalEchoRequest;import de.mud.jta.event.EndOfRecordRequest;import de.mud.jta.event.EndOfRecordRequest;import de.mud.telnet.TelnetProtocolHandler;import java.awt.Dimension;import java.io.IOException;/** * The telnet plugin utilizes a telnet protocol handler to filter * telnet negotiation requests from the data stream. * <P> * <B>Maintainer:</B> Matthias L. Jugel * * @version $Id: Telnet.java,v 2.11 2000/12/22 11:34:29 marcus Exp $ * @author Matthias L. Jugel, Marcus Mei遪er */public class Telnet extends Plugin implements FilterPlugin {  protected FilterPlugin source;  protected TelnetProtocolHandler handler;  private final static int debug = 0;  /**   * Create a new telnet plugin.   */  public Telnet(final PluginBus bus, String id) {    super(bus, id);    // create a new telnet protocol handler    handler = new TelnetProtocolHandler() {      /** get the current terminal type */      public String getTerminalType() {        return (String)bus.broadcast(new TerminalTypeRequest());      }      /** get the current window size */      public Dimension getWindowSize() {        return (Dimension)bus.broadcast(new WindowSizeRequest());      }      /** notify about local echo */      public void setLocalEcho(boolean echo) {        bus.broadcast(new LocalEchoRequest(echo));      }      /** notify about EOR end of record */      public void notifyEndOfRecord() {        bus.broadcast(new EndOfRecordRequest());      }      /** write data to our back end */      public void write(byte[] b) throws IOException {        source.write(b);      }    };    // reset the telnet protocol handler just in case :-)    bus.registerPluginListener(new OnlineStatusListener() {      public void online() {        handler.reset();        try {          handler.startup();        } catch(java.io.IOException e) {        }        bus.broadcast(new LocalEchoRequest(true));      }      public void offline() {        handler.reset();        bus.broadcast(new LocalEchoRequest(true));      }    });    bus.registerPluginListener(new ConfigurationListener() {      public void setConfiguration(PluginConfig config) {        configure(config);      }    });    bus.registerPluginListener(new TelnetCommandListener() {      public void sendTelnetCommand(byte command) throws IOException {        handler.sendTelnetControl(command);      }    });  }  public void configure(PluginConfig cfg) {    String crlf = cfg.getProperty("Telnet",id,"crlf");	// on \n    if (crlf != null) handler.setCRLF(crlf);    String cr = cfg.getProperty("Telnet",id,"cr");	// on \r    if (cr != null) handler.setCR(cr);  }  public void setFilterSource(FilterPlugin source) {    if(debug>0) System.err.println("Telnet: connected to: "+source);    this.source = source;  }  public int read(byte[] b) throws IOException {    // We just don't pass read() down, since negotiate() might call other    // functions and we need transaction points.    int n;    n = handler.negotiate(b);	// we still have stuff buffered ...    if (n>0)      return n;    while (true) {      n = source.read(b);      if (n <= 0 )	return n;      handler.inputfeed(b,n);      n = 0;      while (true) {	n = handler.negotiate(b);	if (n>0)	  return n;	if (n==-1) // buffer empty.	  break;      }      return 0;    }  }  public void write(byte[] b) throws IOException {    handler.transpose(b); // transpose 0xff or \n and send data  }}