Ticket #675: NmeaReader.java

// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.io;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.data.gpx.GpxData;
import org.openstreetmap.josm.data.gpx.GpxTrack;
import org.openstreetmap.josm.data.gpx.WayPoint;

public class NmeaReader {

        /**
         * The resulting gpx data
         */
        public GpxData data;
        public enum state { init, metadata, wpt, rte, trk, ext, author, link, trkseg }

        /**
         * Parse the input stream and store the result in trackData and markerData
         * 
         * @param relativeMarkerPath The directory to use as relative path for all <wpt> 
         *    marker tags. Maybe <code>null</code>, in which case no relative urls are constructed for the markers. 
         */
        public NmeaReader(InputStream source, File relativeMarkerPath) throws IOException {
                
                BufferedReader reader = new BufferedReader( new InputStreamReader(source));
                ArrayList<WayPoint> waypoints = new ArrayList<WayPoint>();
                int latdeg,londeg;
                double latmin,lonmin;
                LatLon ll;
                String line=null;
                while((line = reader.readLine())!=null){
                        if(line.startsWith("$GPRMC")){
                                // Parse in:
                                /* GPRMC,191410,A,4735.5634,N,00739.3538,E,0.0,0.0,181102,0.4,E,A*19
                                         ^      ^ ^           ^            ^   ^   ^      ^     ^ ^
                                         |      | |           |            |   |   |      |     | |
                                         |      | |           |            |   |   |      |     | Checksum
                                         |      | |           |            |   |   |      |     |
                                         |      | |           |            |   |   |      |     Mode (A,D,E,N,S)
                                         |      | |           |            |   |   |      |
                                         |      | |           |            |   |   |      magnetic
                                         |      | |           |            |   |   |      Declination 0.4° E
                                         |      | |           |            |   |   |
                                         |      | |           |            |   |   Datum: 18.11.02
                                         |      | |           |            |   |
                                         |      | |           |            |   Heading (without motion: 0)
                                         |      | |           |            |
                                         |      | |           |            Speed over ground (Knots)
                                         |      | |           |
                                         |      | |           longitude 007° 39.3538' East
                                         |      | |
                                         |      | latitude 47° 35.5634' North
                                         |      |
                                         |      Receiver warning, A = Data OK, V = Warning
                                         |
                                         19:14:10 UTC time */
                                try {
                        String[] parts = line.split(",");
                        if("A".equals(parts[2])){
                                latdeg=Integer.parseInt(parts[3].substring(0,2));
                                if("S".equals(parts[4]))
                                        latdeg=-latdeg;
                                latmin=Double.parseDouble(parts[3].substring(2));
                                
                                londeg=Integer.parseInt(parts[5].substring(0,3));
                                if("W".equals(parts[6]))
                                        londeg=-londeg;
                                lonmin=Double.parseDouble(parts[5].substring(3));
                                
                                ll=new LatLon(latdeg+latmin/60,londeg+lonmin/60);
                                WayPoint wp = new WayPoint(ll);
                                waypoints.add(wp);
                        }
                } catch (NumberFormatException e) {
                }
                        }
                }
                GpxTrack track = new GpxTrack();
                track.trackSegs.add(waypoints);
                ArrayList<GpxTrack>tracks=new ArrayList<GpxTrack>();
                tracks.add(track);
                data=new GpxData();
                data.tracks=tracks;
        }
}