GPXPointReaderHandler.java

/**
 * *****************************************************************************
 * Copyright 2013 Johannes Mitlmeier
 *
 * 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 de.fub.agg2graph.input;

import de.fub.agg2graph.structs.GPSPoint;
import de.fub.agg2graph.structs.GPSSegment;
import de.fub.agg2graph.structs.GPSTrack;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

/**
 * Extract data structures ({@link GPSTrack}s, {@link GPSSegment}s,
 * {@link GPSPoint}s) from a gpx file.
 *
 * @author Johannes Mitlmeier
 *
 */
public class GPXPointReaderHandler extends DefaultHandler {

    private static final Logger LOG = Logger.getLogger("agg2graph");
    private List<GPSTrack> tracks;
    private List<GPSSegment> segments;
    private List<GPSPoint> points;

    public GPXPointReaderHandler() {
        this.tracks = new ArrayList<GPSTrack>();
        this.segments = new ArrayList<GPSSegment>();
        this.points = new ArrayList<GPSPoint>();
    }

    @Override
    public void startDocument() {
        LOG.finer("startDocument");
    }

    @Override
    public void endDocument() {
        LOG.finer("endDocument");
    }

    @Override
    public void startElement(String namespaceURI, String localName,
            String qName, Attributes atts) {
        if ("trk".equals(qName)) {
            tracks.add(new GPSTrack());
        }
        if ("trkseg".equals(qName)) {
            GPSSegment segment = new GPSSegment();
            if (!tracks.isEmpty()) {
                tracks.get(tracks.size() - 1).add(segment);
            }
            segments.add(segment);
        } else if ("trkpt".equals(qName)) {
            GPSPoint point = new GPSPoint();
            for (int i = 0; i < atts.getLength(); i++) {
                if ("lon".equals(atts.getQName(i))) {
                    point.setLon(Float.parseFloat(atts.getValue(i)));
                } else if ("lat".equals(atts.getQName(i))) {
                    point.setLat(Float.parseFloat(atts.getValue(i)));
                } else if ("time".equals(atts.getQName(i))) {
                    try {
                        XMLGregorianCalendar newXMLGregorianCalendar = DatatypeFactory.newInstance().newXMLGregorianCalendar(atts.getValue(i));
                        point.setTimestamp(newXMLGregorianCalendar.toGregorianCalendar().getTime());
                    } catch (DatatypeConfigurationException ex) {
                        LOG.log(Level.SEVERE, null, ex);
                    }
                }
            }
            points.add(point);
            if (!segments.isEmpty()) {
                segments.get(segments.size() - 1).add(point);
            }
        }

    }

    public List<GPSPoint> getPoints() {
        return points;
    }

    public List<GPSSegment> getSegments() {
        return segments;
    }

    public List<GPSTrack> getTracks() {
        return tracks;
    }
}