org.wamblee.gpx.GpxParser Maven / Gradle / Ivy

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/*
 * Copyright 2006 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.wamblee.gpx;

import java.io.InputStream;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.Element;
import org.wamblee.gps.track.Track;
import org.wamblee.gps.track.TrackImpl;
import org.wamblee.gps.track.TrackPoint;
import org.wamblee.gps.track.TrackSegment;
import org.wamblee.gps.track.TrackSegmentImpl;
import org.wamblee.xml.DomUtils;
import org.wamblee.xml.XMLException;

/**
 * Parser for GPX tracks.
 * 
 * @author Erik Brakkee
 */
public class GpxParser {

    private static final String SCHEMA_RESOURCE = "gpx.xsd";

    public GpxParser() {
        // Empty.
    }

    public Track parse(String aDescription, InputStream aIs) throws XMLException {
        Document doc = DomUtils.convert(DomUtils.read(aIs));
        return parse(aDescription, doc);
    }

    /**
     * @param doc
     */
    public Track parse(String aDescription, Document doc) {
        TrackImpl result = new TrackImpl(aDescription);
        List tracks = doc.getRootElement().elements("trk");
        if ( tracks != null ) { 
            for (Element track: tracks) {
                String trackName = track.elementText("name");
                TrackSegmentImpl trackSegment = new TrackSegmentImpl(trackName);
                result.addSegment(trackSegment);
                List segments = track.elements("trkseg");
                if ( segments != null ) { 
                    for (Element segment: segments) {           
                        parseTrackPoints(trackSegment, segment.elementIterator("trkpt"));
                    }
                }
            }
        }

        List routes = doc.getRootElement().elements("rte");
        if ( routes != null ) {
            for (Element route: routes) {
                String routeName = route.elementText("desc");
                TrackSegmentImpl trackSegment = new TrackSegmentImpl(routeName);
                result.addSegment(trackSegment);
                parseTrackPoints(trackSegment, route.elementIterator("rtept"));
            }
        }
        
        return result;
    }
    
    
    private void parseTrackPoints(TrackSegmentImpl aTrack, Iterator aPoints) { 
        while (aPoints.hasNext()) { 
            Element point = aPoints.next();
            aTrack.addPoint(parseTrackPoint(point));
        }
    }
    

    /**
     * @param trkpt
     */
    private TrackPoint parseTrackPoint(Element trkpt) {
        // System.out.println(trkpt.asXML() + "|\n");
        double latitude = new Double(trkpt.attributeValue("lat"));
        double longitude = new Double(trkpt.attributeValue("lon"));
        Element ele = trkpt.element("ele");
        double elevation = 0.0;
        if (ele != null) {
            elevation = new Double(ele.getText());
        }
        // System.out.println(" lat = " + lat + " lon = " + lon + " ele = " +
        // ele);
        return new TrackPoint(latitude, longitude, elevation);
    }

}