package dialer;

/*
 * CommPortModem.java
 *
 * Created on 13 de Junho de 2002, 23:03
 */

import java.awt.*;
import java.io.*;
import javax.comm.*;
import java.util.*;
/**
* Subclasses CommPortOpen and adds send/expect handling for dealing
* with Hayes-type modems.
*
*/
public class CommPortModem extends CommPortOpen {
/** The last line read from the serial port. */
protected String response;
/** A flag to control debugging output. */
protected boolean debug = true;

  public CommPortModem(String port) throws IOException, NoSuchPortException,PortInUseException,
  UnsupportedCommOperationException {
    super(port);
  }

/** Send a line to a PC-style modem. Send \r\n, regardless of
* what platform we're on, instead of using println().
*/
  protected void send(String s) throws IOException {
    if (debug) {
        System.out.print(">>> ");
        System.out.print(s);
        System.out.println();
    }
    System.out.println("printing...");
    os.print(s);
    System.out.println("enter");
    os.print("\r\n");
    
    // Expect the modem to echo the command.
    System.out.println("expect");
    if (!expect(s)) {
        System.err.println("WARNING: Modem did not echo command.");
    }
    System.out.println("read");
   // The modem sends an extra blank line by way of a prompt.
   // Here we read and discard it.
    String junk = is.readLine();
    System.out.println("fim : "+junk);
    if (junk.length() != 0) {
        System.err.print("Warning unexpected response: ");
        System.err.println(junk);
    }
  }
  
  /** Read a line, saving it in "response".
  * @return true if the expected String is contained in the response, false if not.
  */
  protected boolean expect(String exp) throws IOException {
    response = is.readLine();
    if (debug) {
        System.out.print("<<< ");
        System.out.print(response);
        System.out.println();
    }
    return response.indexOf(exp) >= 0;
  }
}