ParseLatLon.java

/*
GNU General Public License
CacheWolf is a software for PocketPC, Win and Linux that
enables paperless caching.
It supports the sites geocaching.com and opencaching.de

Copyright (C) 2006  CacheWolf development team
See http://www.cachewolf.de/ for more information.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
package CacheWolf.navi;

import CacheWolf.utils.Common;
import ewe.sys.Convert;

/**
*	This class parses a string representation of longitude and latitude.
*	The result is a double value representing longitude and another representing
*	latitude (DD.dddd)
*/
public class ParseLatLon {

    String latlon;
    /**
    *	After a calling the method parse()
    *	this variable holds the double value of latitude
    */
    public double lat2;
    /**
    *	After a calling the method parse()
    *	this variable holds the double value of longitude
    */
    public double lon2;

    private char digSep;

    /**
    *	Constructor to parse a lat lon string like:
    *	N 49 33.167 E 011 21.608
    */
    public ParseLatLon(String ll) {
	latlon = ll;
	digSep = Common.getDigSeparator();
    }

    /**
    *	Constructor to parse a lat lon string like:
    *	N 49 33.167 E 011 21.608.
    *	Additionally you may pass the decimal symbol, i.e. "." or ","
    */
    public ParseLatLon(String ll, String tr) {
	latlon = ll;
	digSep = Common.getDigSeparator();
    }

    private int start;
    private int end;

    /** Get the next non-blank part of the latlon String */
    String getNext() {
	start = end;
	while (latlon.charAt(start) == ' ')
	    start++; // skip blanks
	end = start;
	while (latlon.charAt(end) != ' ')
	    end++; // collect non-blanks
	return latlon.substring(start, end);
    }

    /**
    * Parse a string that contains lat lon into it's lat and lon doubles. Class
    * variable latlon must have been set befor you call this method.
    */
    public void parse() throws NumberFormatException {
	if (digSep == ',')
	    latlon = latlon.replace('.', ',') + " ";
	else
	    latlon = latlon.replace(',', '.') + " ";
	try {
	    end = 0;
	    String latNS = getNext();
	    String latDeg = getNext();
	    String latMin = getNext();
	    String lonEW = getNext();
	    String lonDeg = getNext();
	    String lonMin = getNext();
	    if (lonDeg.endsWith("�")) {
		lonDeg = lonDeg.substring(0, lonDeg.length() - 1); // remove �
	    }
	    if (latDeg.endsWith("�")) {
		latDeg = latDeg.substring(0, latDeg.length() - 1);// remove �
	    }
	    lat2 = Convert.parseDouble(latDeg) + Convert.parseDouble(latMin) / 60.0;
	    if (latNS.charAt(0) == 'S')
		lat2 = -lat2;
	    lon2 = Convert.parseDouble(lonDeg) + Convert.parseDouble(lonMin) / 60.0;
	    if (lonEW.charAt(0) == 'W')
		lon2 = -lon2;
	} catch (Exception e) {
	    throw new NumberFormatException("Coordinates must be entered in the format N DD MM.MMM E DDD MM.MMM");
	}

    }
}