Hi,

Please help if you can (with probably a very basic OO newbie question): -

I have created a class that uses the java.net.Socket class to talk to my
server and everything is great. I then converted the code to use the
javax.net.SSLSocket class and (thanks to how easy Java makes it for us!)
everything is still great. What I want to do now is parameterize/optionalize
the use of SSL or in-the-clear Sockets within my class, and I'm struggling
to find a modular, let alone elegant, solution.

At the moment I plan to add another Applet parameter called SSL_REQD and I
will pass that to my constructor, but because of Java's compile-time
resolution of methods-to-objects, I find myself having to duplicate code
that is erstwhile 99% identical or common. Is there some way (short of
Reflection) that I can leverage the fact SSLSocket class inherits most of
its methods from the Socket class so that I only need one method for each
socket function regardless of what flavour socket is in use?

For example: -

private someSocket t3Sock;

if (sssReqd)
 t3Sock = (SSLSocket)sockFactory.createSocket();
else
 t3Sock = new Socket();

t3Sock.setKeepAlive(true);

Am I stuck with "One's an Apple and the other's an Orange (albeit painted
red :-)"?

If few of the Socket methods are overridden by SSLSocket (and the
value-added encryption stuff happens at a lower/other level) can I just cast
my way around some of this? Just stick in a few "if" statements and stop
moanin'?

Cheers Richard Maher

Here is the complete Tier3Socket class definition: -

import java.io.BufferedOutputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.net.SocketTimeoutException;
import java.lang.System;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;

public class Tier3Socket
{
public  static final
        String                T3ID="T3$";
public  static final
        int                   USERSIZ=40;
public  static final
        int                   T3IDBUFSIZ=48;
public  static final
        int                   CREDBUFSIZ=80;
public  static final
        int                   CONTIMOUT=10000;

public  byte []               t3IdBuf;
public  byte []               readBuf;
public  byte []               writeBuf;

private String                host;
private int                   port;
private int                   maxBufSiz;
private int                   bytesIn;
private String                hostCharSet;
private SSLSocket             t3Sock;
private SSLSocketFactory      sockFactory;
private BufferedInputStream   in;
private BufferedOutputStream  out;
private byte []               outUser;
private byte []               outPwd;
private byte []               credBuf;
private String                inMsg;
private String                stringOut;

Tier3Socket (String host, int port, int maxBufSiz, String hostCharSet)
{
 this.host        = host;
 this.port        = port;
 this.maxBufSiz   = maxBufSiz;
 this.hostCharSet = hostCharSet;
 this.bytesIn     = 0;

 t3IdBuf  = new byte[T3IDBUFSIZ];
 readBuf  = new byte[maxBufSiz];

 sockFactory = (SSLSocketFactory)SSLSocketFactory.getDefault();
}

public void open() throws UnknownHostException, IOException
{
 t3Sock = (SSLSocket)sockFactory.createSocket();
 t3Sock.setKeepAlive(true);
 t3Sock.setReuseAddress(true);
 t3Sock.setTcpNoDelay(true);

 t3Sock.connect(new InetSocketAddress(host,port), CONTIMOUT);

 System.out.println("Connected OK");

 in  = new BufferedInputStream  (t3Sock.getInputStream() ,maxBufSiz);
 out = new BufferedOutputStream (t3Sock.getOutputStream(),maxBufSiz);

 t3Sock.setUseClientMode(true);

 System.out.println("Going for SSL");

 try {t3Sock.startHandshake();}
     catch (IOException e)
           {
            System.out.println("Failed SSL Handshake");
            throw new IOException("Can't SSL on Socket");
           }
}

public void handShake(String username, String password) throws IOException
{
 credBuf = new byte[CREDBUFSIZ];

 outUser = username.getBytes(hostCharSet);
 System.arraycopy(outUser, 0, credBuf, 0, outUser.length);

 outPwd  = password.getBytes(hostCharSet);
 System.arraycopy(outPwd, 0, credBuf, USERSIZ, outPwd.length);

 out.write(credBuf, 0, CREDBUFSIZ);
 out.flush();

 if (in.read(t3IdBuf) < t3IdBuf.length)
 {
     System.out.println("Read < " + Integer.toString(t3IdBuf.length) + "
bytes");
     throw new IOException();
 }

 inMsg = new String(t3IdBuf, 0, 3, hostCharSet);

 if (!inMsg.equals(T3ID))
 {
     throw new IOException();
 }
}

public void sendUrgentData (int oob) throws IOException
{
    t3Sock.sendUrgentData(oob);
}

public void setTimeout(int msecs) throws UnknownHostException, IOException
{
 t3Sock.setSoTimeout(msecs);
}

public void close () throws IOException
{
 if (t3Sock != null && !t3Sock.isClosed())
 {
     try {t3Sock.close();}
     catch (Exception e)
           {e.printStackTrace();}
 }
}

public void buffMessage (String message) throws IOException
{
 byte [] msg = message.getBytes(hostCharSet);

 out.write(msg);
}

public void sendMessage (String message) throws IOException
{
 byte [] msg = message.getBytes(hostCharSet);

 out.write(msg);
 flush();
}

public void flush () throws IOException
{
 out.flush();
}

public int readMessage () throws IOException
{
 return readMessage(readBuf.length);
}

public int readMessage (int bytes) throws IOException
{
 try
     {
     bytesIn = in.read(readBuf, 0, bytes);
     }
 catch (SocketTimeoutException e)
     {
     return 0;
     }

 return bytesIn;
}

public String getString () throws ArrayIndexOutOfBoundsException
{
 return getString(0, bytesIn);
}

public String getString (int offset, int length) throws
ArrayIndexOutOfBoundsException
{
 if ((offset + length) > bytesIn)
 {
     throw new ArrayIndexOutOfBoundsException();
 }
 try
     {
     stringOut = new String(readBuf, offset, length, hostCharSet);
     }
 catch (Exception e)
     {
     return null;
     }

 return stringOut;
}

}