GPXCoordinate.java

/**
 * H2GIS is a library that brings spatial support to the H2 Database Engine
 * <http://www.h2database.com>. H2GIS is developed by CNRS
 * <http://www.cnrs.fr/>.
 *
 * This code is part of the H2GIS project. H2GIS is free software; 
 * you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software Foundation;
 * version 3.0 of the License.
 *
 * H2GIS 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 Lesser General Public License
 * for more details <http://www.gnu.org/licenses/>.
 *
 *
 * For more information, please consult: <http://www.h2gis.org/>
 * or contact directly: info_at_h2gis.org
 */

package org.h2gis.functions.io.gpx.model;

import com.vividsolutions.jts.geom.Coordinate;
import org.xml.sax.Attributes;

/**
 * This class is used to convert a waypoint to a coordinate
 * @author Erwan Bocher
 */
public class GPXCoordinate {
    
    /**
     * General method to create a coordinate from a gpx point. 
     *
     * @param attributes Attributes of the point. Here it is latitude and
     * longitude
     * @throws NumberFormatException
     * @return a coordinate
     */
    public static Coordinate createCoordinate(Attributes attributes) throws NumberFormatException {
        // Associate a latitude and a longitude to the point
        double lat;
        double lon;
        try {
            lat = Double.parseDouble(attributes.getValue(GPXTags.LAT));
        } catch (NumberFormatException e) {
            throw new NumberFormatException("Cannot parse the latitude value");
        }
        try {
            lon = Double.parseDouble(attributes.getValue(GPXTags.LON));
        } catch (NumberFormatException e) {
            throw new NumberFormatException("Cannot parse the longitude value");
        }
        String eleValue = attributes.getValue(GPXTags.ELE);
        double ele = Double.NaN;
        if (eleValue != null) {
            try {
                ele = Double.parseDouble(eleValue);

            } catch (NumberFormatException e) {
                throw new NumberFormatException("Cannot parse the elevation value");
            }
        }        
        return new Coordinate(lon, lat, ele);
    }
}