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package tim.prune.function;
import java.util.ArrayList;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import tim.prune.function.gpsies.GpsiesTrack;
/**
* XML handler for dealing with XML returned from gpsies.com
*/
public class GetWikipediaXmlHandler extends DefaultHandler
{
private String _value = null;
private ArrayList<GpsiesTrack> _trackList = null;
private GpsiesTrack _track = null;
private String _lat = null, _lon = null;
private String _errorMessage = null;
/**
* React to the start of an XML tag
*/
public void startElement(String inUri, String inLocalName, String inTagName,
Attributes inAttributes) throws SAXException
{
if (inTagName.equals("geonames")) {
_trackList = new ArrayList<GpsiesTrack>();
}
else if (inTagName.equals("entry")) {
_track = new GpsiesTrack();
_lat = null;
_lon = null;
}
else if (inTagName.equals("status")) {
_errorMessage = inAttributes.getValue("message");
}
else _value = null;
super.startElement(inUri, inLocalName, inTagName, inAttributes);
}
/**
* React to the end of an XML tag
*/
public void endElement(String inUri, String inLocalName, String inTagName)
throws SAXException
{
if (inTagName.equals("entry")) {
// end of the entry
_track.setDownloadLink(_lat + "," + _lon);
_trackList.add(_track);
}
else if (inTagName.equals("title")) {
_track.setTrackName(_value);
}
else if (inTagName.equals("summary")) {
_track.setDescription(_value);
}
else if (inTagName.equals("lat")) {
_lat = _value;
}
else if (inTagName.equals("lng")) {
_lon = _value;
}
else if (inTagName.equals("distance")) {
try {
_track.setLength(Double.parseDouble(_value) * 1000.0); // convert from km to m
}
catch (NumberFormatException nfe) {}
}
else if (inTagName.equals("wikipediaUrl")) {
_track.setWebUrl(_value);
}
super.endElement(inUri, inLocalName, inTagName);
}
/**
* React to characters received inside tags
*/
public void characters(char[] inCh, int inStart, int inLength)
throws SAXException
{
String value = new String(inCh, inStart, inLength);
_value = (_value==null?value:_value+value);
super.characters(inCh, inStart, inLength);
}
/**
* @return the list of tracks
*/
public ArrayList<GpsiesTrack> getTrackList()
{
return _trackList;
}
/**
* @return error message, if any
*/
public String getErrorMessage() {
return _errorMessage;
}
}
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