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Demonstrating the abilities of the Swing UI Toolkit swingset2 and swingx aka swingset3
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package org.jxmapviewer.demos;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.logging.Logger;

import me.himanshusoni.gpxparser.GPXParser;
import me.himanshusoni.gpxparser.modal.Extension;
import me.himanshusoni.gpxparser.modal.GPX;
import me.himanshusoni.gpxparser.modal.Metadata;
import me.himanshusoni.gpxparser.modal.Route;
import me.himanshusoni.gpxparser.modal.Track;
import me.himanshusoni.gpxparser.modal.TrackSegment;
import me.himanshusoni.gpxparser.modal.Waypoint;
import swingset.StaticUtilities;

/*

in https://github.com/osmandapp/OsmAnd gibt es eine vollständige
public class net.osmand.gpx.GPXFile extends GPXUtilities.GPXExtensions

hier nur rudimentär
 */
public class GPXFile {

	private static final Logger LOG = Logger.getLogger(GPXFile.class.getName());

	private GPX gpx;
	
// in OsmAnd:	public GPXUtilities.Metadata metadata = new GPXUtilities.Metadata();	
	private HashSet routes;
	private HashSet tracks;
	private HashSet waypoints;
	private HashMap extData;

	/**
	 * 
	 * @param gpxFileName example "resources/Mittelweg.gpx"
	 */
	public GPXFile(String gpxFileName) {
		this(StaticUtilities.getResourceAsStream(GPXFile.class, gpxFileName));
	}
	public GPXFile(InputStream is) {
        GPXParser p = new GPXParser();
        p.addExtensionParser(new OsmExtensionParser());
		try {
			gpx = p.parseGPX(is); // throws Exception
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public Metadata getMetadata() {
		return gpx.getMetadata();
	}

	public HashSet getWaypoints() {
		if (waypoints == null)
			waypoints = gpx.getWaypoints();
		LOG.config("waypoints.size="+(waypoints==null ? "null" : waypoints.size()));
		return waypoints;
	}

	/**
	 * Parsed OSM Extensions
	 * @return Extension or null if there is no osmaand extension
	 */
	public Extension getOsmExtension() {
		extData = gpx.getExtensionData();
		if(extData==null) return null;
		LOG.config("extData.Size="+extData.size());
		Set keys = extData.keySet();
		for(String key : keys) {
			Object value = extData.get(key);
			if(value instanceof OsmExtensionHolder oeh) {
				return oeh.getExtension();
			}
		}
		return null;	
	}
	
	/**
	 * returns osmand:network_route extension parsed to RouteKey
	 * @return RouteKey
	 */
	public RouteKey getRouteKey() {
		Extension osmext = getOsmExtension();
		if(osmext==null) return null;
		return (RouteKey)osmext.getExtensionData("osmand:network_route");
	}
	private HashMap getExtensionData() {
		extData = gpx.getExtensionData();
		if(extData!=null) extData.forEach((k,v) -> {
			if(v instanceof OsmExtensionHolder oeh) {
				LOG.info(k + "=> nodes#="+ (oeh.getNodeList()==null?"no NodeList":oeh.getNodeList().getLength()));
// INFORMATION: OSM Extension Parser=> nodes#=23 nicht geparsed!
				Extension ext = oeh.getExtension();
				LOG.info(k + "=> parsed nodes#="+ (ext==null?"no Extension":ext.getExtensionsParsed()));
				if(ext!=null) {
					ext.getExtensionData().forEach((id,data) -> {
						if(data instanceof RouteKey rk) {
							LOG.info(id + " : getRouteName=" + rk.getRouteName());
						}
						LOG.info(id + " : " + data);
					});
				}			
			}
		});
		return extData;
	}

	public int getTracksSize() {
		if (tracks == null)
			tracks = gpx.getTracks();
		return tracks.size();
	}

	/**
	 * in GPX there are routes, tracks and waypoints.
	 * This method extracts all waypoints in all tracks.
	 * @return all Waypoints in all trackSegments
	 */
	/*

in package org.jxmapviewer.viewer ist Waypoint ein interface mit
public GeoPosition getPosition();
und GeoPosition besteht aus (zweidimensional) latitude + longitude (ohne elv)
public GeoPosition(double latitude, double longitude) {

	 */
	public ArrayList getTrackWaypoints() {
		if (tracks == null)
			tracks = gpx.getTracks();
		LOG.config((getMetadata()==null ? "" : getMetadata().getName() + " : ")
			+ "routes:" + routes + " tracks:" + tracks + ",size=" + tracks.size() 
			+ " waypoints:" + waypoints + " extData:" + extData);
		ArrayList allWpts = new ArrayList();
		for (Track track : tracks) {
			LOG.fine("track.Name:" + track.getName());
			List trackSegments = track.getTrackSegments(); // ArrayList
			for (TrackSegment segment : trackSegments) {
				ArrayList wpts = segment.getWaypoints();
				LOG.fine("segment:" + segment + " with "+wpts.size()+" waypoints.");
				allWpts.addAll(wpts);
			}

		}
		return allWpts;
	}
	public ArrayList getTrackWaypoints(int trackNo) {
		int size = getTracksSize();
		if(trackNo>=0 && trackNo iter = tracks.iterator();
	        int i = 0;
			while (iter.hasNext()) {
				Track next = iter.next();
				if(i==trackNo) return getTrackWaypoints(next);
				i++;
			}
		}
		// empty:
		return new ArrayList();
	}
	
	private ArrayList getTrackWaypoints(Track track) {
		LOG.info("track.Name:" + track.getName());
		ArrayList allWpts = new ArrayList();
		List trackSegments = track.getTrackSegments(); // ArrayList
		for (TrackSegment segment : trackSegments) {
			ArrayList wpts = segment.getWaypoints();
			LOG.info("segment:" + segment + " with "+wpts.size()+" waypoints.");
			allWpts.addAll(wpts);
		}
		return allWpts;
	}
	
	public static void main(String[] args) {
		GPXFile gpxf = new GPXFile( //"resources/Mad_17_BalcoesRibeiroFrio.gpx"); 
//				"resources/Mittelweg.gpx");
				"resources/Odenwald-Weg.gpx");
//				"resources/westweg-etappe1.gpx");
//				"resources/westweg-1+2.gpx");
		ArrayList wpts = gpxf.getTrackWaypoints();
		for (Waypoint wp : wpts) {
			LOG.fine("wp:" + wp);
		}
		
		gpxf.getExtensionData();
	}
}