// StreetRouterImpl.java
// Implementation of the StreetRouter CORBA object


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

public class StreetRouterImpl extends Proxy._StreetRouterImplBase {

  // Constructor of this class
  public StreetRouterImpl (String name) {
    super(name);
    return;
  }

  // Implementation of the method lookupdirections
  // The parameters would something like:
  // frocity: stanford
  // fromstate: california
  // tocity: san francisco
  // tostate: california
  //
  // The result of calling this method is a string with street directions
  // from one point ot the other
  public String lookupdirections(String fromcity,
                                        String fromstate,
                                        String tocity,
                                        String tostate) {
    try {
      // Here we build the URL and connect to the web server
      URL url = new URL("http://www.mapquest.com/cgi-bin/mqtrip?OPC=-1&ADDR_ORIGIN=&CITY_ORIGIN="+fromcity.replace(' ', '+')+"&STATE_ORIGIN="+fromstate+"&DPC=-1&ADDR_DESTINATION=&CITY_DESTINATION="+tocity.replace(' ', '+')+"&STATE_DESTINATION="+tostate+"&quest_mode=trip&results_display_mode=text");
    
      URLConnection connection=url.openConnection();
      DataInputStream d = new DataInputStream(connection.getInputStream());

      // Extracting the directions
      String directions="Directions from "+fromcity+", "+fromstate+" to "+tocity+", "+tostate+":";
      String line = d.readLine();
      String substring = "</B><FONT SIZE=-1>";
  
      try {
        do {
          line = d.readLine();
          if (line.indexOf(substring) != -1) directions=directions+"\n"+line.substring(line.indexOf(substring)+substring.length(),line.indexOf("</F"));
        }
        while (line != null);
      }
      catch (NullPointerException e) {};
      System.out.println(directions);
      return(directions);
    }
    catch (Exception e) {
      System.err.println(e);
    }
    return "";
  }

}