/*
 * Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */
import java.io.*;
import java.net.*;
import java.util.*;

class TalkServerThread extends Thread {
    public Socket socket;
    public DataInputStream is;
    public DataOutputStream os;
    TalkServer server;
    boolean DEBUG = true;

    public String toString() {
	return "TalkServerThread: socket = " + socket
	       + "; is = " + is
	       + "; os = " + os;
    }

    TalkServerThread(Socket socket, TalkServer server) throws IOException {
	super("TalkServer");

	is = new DataInputStream(socket.getInputStream());
	os = new DataOutputStream(socket.getOutputStream());

	if (is == null) {
	    System.err.println("TalkServerThread: Input stream seemed "
			       + "to be created successfully, but it's null.");
	    throw new IOException();
	}

	if (os == null) {
	    System.err.println("TalkServerThread: Output stream seemed "
			       + "to be created successfully, but it's null.");
	    throw new IOException();
	}

	this.socket = socket;
	this.server = server;
    }

    public void run() {
	while (socket != null) {
	    try {
		//Read data.
		String str = is.readUTF();

		//Pass it on.
		if (str != null) {
		    server.forwardString(str, this);
		}
	    } catch (EOFException e) { //No more data on this socket...
		server.forwardString("SERVER SAYS other applet disconnected",
				     this);
		cleanup();
		return;
	    } catch (NullPointerException e) { //Socket doesn't exist...
		server.forwardString("SERVER SAYS no socket to other applet",
				     this);
		cleanup();
		return;
	    } catch (IOException e) { //Read problem..
		server.forwardString("SERVER SAYS socket trouble with other applet",
				     this);
		cleanup();
		return;
	    } catch (Exception e) { //Unknown exception. Complain and quit.
		System.err.println("Exception on is.readUTF():");
		e.printStackTrace();
		cleanup();
		return;
	    }
	}
    }

    protected void finalize() {
	cleanup();
    }

    void cleanup() {
	try {
	    if (is != null) {
	        is.close();
	        is = null;
	    }
	} catch (Exception e) {} //Ignore errors.

	try {
	    if (os != null) {
	        os.close();
	        os = null;
	    }
	} catch (Exception e) {} //Ignore errors.

	try {
	    if (socket != null) {
	        socket.close();
	        socket = null;
	    }
	} catch (Exception e) {} //Ignore errors.
    }

}