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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.formats.gpx;
import gov.nasa.worldwind.util.Logging;
import gov.nasa.worldwind.tracks.Track;
import gov.nasa.worldwind.tracks.TrackSegment;
import gov.nasa.worldwind.tracks.TrackPoint;
/**
* @author dcollins
* @version $Id: GpxWriter.java 1171 2013-02-11 21:45:02Z dcollins $
*/
public class GpxWriter
{
private final org.w3c.dom.Document doc;
private final javax.xml.transform.Result result;
public GpxWriter(String path) throws java.io.IOException, javax.xml.parsers.ParserConfigurationException
{
if (path == null)
{
String msg = Logging.getMessage("nullValue.PathIsNull");
Logging.logger().severe(msg);
throw new IllegalArgumentException(msg);
}
javax.xml.parsers.DocumentBuilderFactory factory = javax.xml.parsers.DocumentBuilderFactory.newInstance();
this.doc = factory.newDocumentBuilder().newDocument();
this.result = new javax.xml.transform.stream.StreamResult(new java.io.File(path));
createGpxDocument(this.doc);
}
public GpxWriter(java.io.OutputStream stream) throws java.io.IOException, javax.xml.parsers.ParserConfigurationException
{
if (stream == null)
{
String msg = Logging.getMessage("nullValue.InputStreamIsNull");
Logging.logger().severe(msg);
throw new IllegalArgumentException(msg);
}
javax.xml.parsers.DocumentBuilderFactory factory = javax.xml.parsers.DocumentBuilderFactory.newInstance();
this.doc = factory.newDocumentBuilder().newDocument();
this.result = new javax.xml.transform.stream.StreamResult(stream);
createGpxDocument(this.doc);
}
public void writeTrack(Track track) throws javax.xml.transform.TransformerException
{
if (track == null)
{
String msg = Logging.getMessage("nullValue.TrackIsNull");
Logging.logger().severe(msg);
throw new IllegalArgumentException(msg);
}
doWriteTrack(track, this.doc.getDocumentElement());
doFlush();
}
public void close()
{
// Intentionally left blank,
// as a placeholder for future functionality.
}
private void createGpxDocument(org.w3c.dom.Document doc)
{
// Create the GPX document root when the document
// doesn't already have a root element.
if (doc != null)
{
if (doc.getDocumentElement() != null)
doc.removeChild(doc.getDocumentElement());
doc.setXmlStandalone(false);
org.w3c.dom.Element gpx = doc.createElement("gpx");
gpx.setAttribute("version", "1.1");
gpx.setAttribute("creator", "NASA World Wind");
doc.appendChild(gpx);
}
}
private void doWriteTrack(Track track, org.w3c.dom.Element elem)
{
if (track != null)
{
org.w3c.dom.Element trk = this.doc.createElement("trk");
if (track.getName() != null)
{
org.w3c.dom.Element name = this.doc.createElement("name");
org.w3c.dom.Text nameText = this.doc.createTextNode(track.getName());
name.appendChild(nameText);
trk.appendChild(name);
}
if (track.getSegments() != null)
{
for (TrackSegment ts : track.getSegments())
doWriteTrackSegment(ts, trk);
}
elem.appendChild(trk);
}
}
private void doWriteTrackSegment(TrackSegment segment, org.w3c.dom.Element elem)
{
if (segment != null)
{
org.w3c.dom.Element trkseg = this.doc.createElement("trkseg");
if (segment.getPoints() != null)
{
for (TrackPoint tp : segment.getPoints())
doWriteTrackPoint(tp, trkseg);
}
elem.appendChild(trkseg);
}
}
private void doWriteTrackPoint(TrackPoint point, org.w3c.dom.Element elem)
{
if (point != null)
{
org.w3c.dom.Element trkpt = this.doc.createElement("trkpt");
trkpt.setAttribute("lat", Double.toString(point.getLatitude()));
trkpt.setAttribute("lon", Double.toString(point.getLongitude()));
org.w3c.dom.Element ele = this.doc.createElement("ele");
org.w3c.dom.Text eleText = this.doc.createTextNode(Double.toString(point.getElevation()));
ele.appendChild(eleText);
trkpt.appendChild(ele);
if (point.getTime() != null)
{
org.w3c.dom.Element time = this.doc.createElement("time");
org.w3c.dom.Text timeText = this.doc.createTextNode(point.getTime());
time.appendChild(timeText);
trkpt.appendChild(time);
}
elem.appendChild(trkpt);
}
}
private void doFlush() throws javax.xml.transform.TransformerException
{
javax.xml.transform.TransformerFactory factory = javax.xml.transform.TransformerFactory.newInstance();
javax.xml.transform.Transformer transformer = factory.newTransformer();
javax.xml.transform.Source source = new javax.xml.transform.dom.DOMSource(this.doc);
transformer.transform(source, this.result);
}
}