import java.io.*;
import java.net.*;

class OneConnection { 
    Socket sock;
    BufferedReader in = null;
    DataOutputStream out = null;

    OneConnection(Socket sock) throws Exception{
        this.sock = sock;
          in  = new BufferedReader( 
		new InputStreamReader( sock.getInputStream() ) );
          out = new DataOutputStream(sock.getOutputStream());
    }

    String getRequest() throws Exception {
        String s=null;
        while ( (s=in.readLine())!=null) {
             System.out.println("got: "+s);
        }
        return s;
    }

    void sendFile(String fname) throws Exception {
        throw new Exception("only implemented in child class B");
    }
}



/////////////////////


class OneConnection_A extends OneConnection { 

    OneConnection_A(Socket sock) throws Exception {
        super(sock);
    }   

    String getRequest() throws Exception {
        String s=null;
        while ( (s=in.readLine())!=null) {
             System.out.println("got: "+s);
             if (s.indexOf("GET") > -1) {
                 out.writeBytes("HTTP-1.0 200 OK\r\n");
                 s = s.substring(4);
                 int i = s.indexOf(" ");
                     System.out.println("file: "+ s.substring(0, i));
                 return s.substring(0, i);
             }
        }
        return null;
    }
}

/////////////////////


class OneConnection_B extends OneConnection_A { 

    OneConnection_B(Socket sock) throws Exception {
        super(sock);
    }   

    void sendFile(String fname) throws Exception {
       String where = "/tmp/" + fname;  // You should create dir if necessary
                                         // and copy try.html file to it.
        if (where.indexOf("..") > -1) 
            throw new SecurityException("No access to parent dirs");
        System.out.println("looking for " + where);
        File f = new File(where);
        DataInputStream din = new DataInputStream(
                                   new FileInputStream(f) );
        int len = (int) f.length();
        byte[] buf = new byte[len];
        din.readFully(buf);
        out.writeBytes("Content-Length: " + len + "\r\n");
        out.writeBytes("Content-Type: text/html\r\n\r\n");
        out.write(buf);
        out.flush();
        out.close();
    }
}



/////////////////////