///////    CgiUrl.java    ///////
import java.io.*;
import java.net.*;

// The msg to send is assumed to be correctly encoded
// and formatted already

public class CgiUrl implements CgiClient
{  public CgiUrl(String cgiurl)
   {  try
      {  URL urlobj = new URL(cgiurl);
         ser = urlobj.openConnection();
         ser.setDoOutput(true);
         out = new PrintWriter(ser.getOutputStream());
      }  catch (MalformedURLException e) { JavaSystem.error(e); }
         catch (IOException e) { JavaSystem.error(e); }
   }

   /* posts the query msg, sets up input streams */
   /* This method can be called only once */
   public void postQuery(String msg)
   {   try
       {  if (out != null)
          {  out.println(msg); out.close();
             ins = ser.getInputStream();
             in = new BufferedReader (new InputStreamReader(ins));
          }
       } catch (IOException e) { JavaSystem.error(e); }
   }

   public TextLines textResponse()
   {  if ( ins != null )
      {  TextLines from = new TextLines();
         int len = from.input(ins);
         if ( len > -1 ) return from;
      }
      return null;
   }

   public String readNextLine()
   {  try
      {   return in.readLine();
      } catch (IOException e) { JavaSystem.error(e); }
      return null;
   }

   public InputStream getInputStream()
   {   return ins;  }

   public void close() {} 

   protected BufferedReader in;
   protected InputStream ins;
   protected PrintWriter out;
   protected URLConnection ser;
}