Getting Directions From Mapquest.com

Directions.java:

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.*;
import java.io.*;
import javax.microedition.io.*;

public class Directions extends MIDlet implements CommandListener {
  private Command exitCommand, goCommand, backCommand;
  private Display display;
  private Form locationsScreen;
  private TextField addrFromField, zipFromField, addrToField, zipToField;
  private Form directionsScreen;

  public Directions() {
    // Get the Display object for the MIDlet
    display = Display.getDisplay(this);

    // Create the Exit, Go, and Back commands
    exitCommand = new Command("Exit", Command.EXIT, 2);
    goCommand = new Command("Go", Command.OK, 2);
    backCommand = new Command("Back", Command.BACK, 2);

    // Create the locations screen form
    locationsScreen = new Form("Enter Locations");
    addrFromField = new TextField("From Address", "6663 Owens Drive", 30, TextField.ANY);
    locationsScreen.append(addrFromField);
    zipFromField = new TextField("From Zip Code", "94588", 5, TextField.NUMERIC);
    locationsScreen.append(zipFromField);
    addrToField = new TextField("To Address", "536 Mission Street", 30, TextField.ANY);
    locationsScreen.append(addrToField);
    zipToField = new TextField("To Zip Code", "94105", 5, TextField.NUMERIC);
    locationsScreen.append(zipToField);

    // Set the Exit and Go commands for the locations screen
    locationsScreen.addCommand(exitCommand);
    locationsScreen.addCommand(goCommand);
    locationsScreen.setCommandListener(this);

    // Create the directions screen form
    directionsScreen = new Form("Directions");

    // Set the Back command for the directions screen
    directionsScreen.addCommand(backCommand);
    directionsScreen.setCommandListener(this);
  }

  public void startApp() throws MIDletStateChangeException {
    // Set the current display to the locations screen
    display.setCurrent(locationsScreen);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
      destroyApp(false);
      notifyDestroyed();
    }
    else if (c == goCommand) {
      // Get the directions
      getDirections(addrFromField.getString().toLowerCase(),
        zipFromField.getString().toLowerCase(),
        addrToField.getString().toLowerCase(),
        zipToField.getString().toLowerCase());
    }
    else if (c == backCommand) {
      // Set the current display back to the locations screen
      display.setCurrent(locationsScreen);

      // Clear the directions
      for (int i = directionsScreen.size() - 1; i >= 0; i--)
        directionsScreen.delete(i);
    }
  }

  private String replaceSpaces(String s) {
    StringBuffer str = new StringBuffer(s);

    // Read each character and replace if it's a space
	// Original code from book
    //for (int i = 0; i < str.length(); i++) {
    //  if (str.charAt(i) == ' ') {
    //    str.deleteCharAt(i);
    //    str.insert(i, "%20");
    //  }
	

	// Read each character and replace if it's a space
	// This block of code I included after mapquest made some changes.
    for (int i = 0; i < str.length(); i++) {
      if (str.charAt(i) == ' ') {
        str.deleteCharAt(i);
        str.insert(i, "+");
      }
    }

    return str.toString();
  }

  private void getDirections(String addrFrom, String zipFrom,
    String addrTo, String zipTo) {
    StreamConnection conn = null;
    InputStream in = null;
    StringBuffer data = new StringBuffer();

    // Replace any spaces in the addresses
    addrFrom = replaceSpaces(addrFrom);
    addrTo = replaceSpaces(addrTo);

    // Build the URL for the directions page (Original)
	// The following line is the original line of the code in the book
    //String url = "http://www.mapquest.com/cgi-bin/mqtrip?link=btwn/twn-ddir_options_jumppage&" +
    //  "print.x=1&" + "ADDR_0=" + addrFrom + "&ZIP_0=" + zipFrom +
    //  "&ADDR_1=" + addrTo + "&ZIP_1=" + zipTo + "&CC_0=US&CC_1=US";

	// Build the URL for the directions page (Adapted after mapquest changed)
	// The following line is the new one I included.
	String url = "http://www.mapquest.com/directions/main.adp?go=1&do=nw&" + 
				 "ct=NA&1ah=&1a=" + addrFrom + "&1p=&1c=&1s=&1z=" + zipFrom + "&1y=US&" + 
				 "2ah=&2a=" + addrTo + "&2p=&2c=&2s=&2z=" + zipTo + "&2y=US&lr=2&x=70&y=15";

    try {
      // Open the HTTP connection
      conn = (StreamConnection)Connector.open(url);

      // Obtain an input stream for the connection
      in = conn.openInputStream();

      // Read a line at a time from the input stream
      int ch, step = 1;
      boolean isStep = false;
      while ((ch = in.read()) != -1) {
        if (ch != '\n') {
          // Read the line a character at a time
          data.append((char)ch);
        }
        else {
          // If this line is a step, add it to the directions text box
          if (isStep) {
            directionsScreen.append(new StringItem("", "* " + data.toString()));
			isStep = false;
          }
          else 
			

            // See if this line precedes a step in the directions
			

			// The following line is the original line of the code in the book
            //if (data.toString().compareTo("<b>" + step + ":</b>") == 0) {

			// This following line does not work due to spaces in the beginning (I believe)
			//if (data.toString().compareTo("<td class=formType align=right><b>" +
			//	step + ":</b>&nbsp;</td>") == 0) {
			

			// The following line is the new one I included. It works but it
			// includes html commands in the result. Need some poolishment.
			if (data.toString().indexOf("<td class=formType align=right><b>" +
					step + ":</b>&nbsp;</td>") >= 0)
			{			
			  System.out.println("indexOf=true - step occurrence found");
              isStep = true;
              step++;
            }

          // Clear the string for the next line
          data = new StringBuffer();
        }
      }
    }
    catch (IOException e) {
      System.err.println("The connection could not be established.");
    }

    // Display the directions screen if everything is OK, otherwise display an alert
    if (directionsScreen.size() > 0)
      display.setCurrent(directionsScreen);
    else
      display.setCurrent(new Alert("Directions",
        "The locations are invalid. Please try again.", null, AlertType.ERROR));
  }
}