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package tim.prune.function.search;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import tim.prune.App;
import tim.prune.I18nManager;
import tim.prune.data.DataPoint;
/**
* Function to load nearby point information from Wikipedia
* according to the currently viewed area
*/
public class GetWikipediaFunction extends GenericDownloaderFunction
{
/** Maximum number of results to get */
private static final int MAX_RESULTS = 20;
/** Maximum distance from point in km */
private static final int MAX_DISTANCE = 15;
/** Username to use for geonames queries */
private static final String GEONAMES_USERNAME = "gpsprune";
/**
* Constructor
* @param inApp App object
*/
public GetWikipediaFunction(App inApp) {
super(inApp);
}
/**
* @return name key
*/
public String getNameKey() {
return "function.getwikipedia";
}
/**
* @param inColNum index of column, 0 or 1
* @return key for this column
*/
protected String getColumnKey(int inColNum)
{
if (inColNum == 0) return "dialog.wikipedia.column.name";
return "dialog.wikipedia.column.distance";
}
/**
* Run method to get the nearby points in a separate thread
*/
public void run()
{
_statusLabel.setText(I18nManager.getText("confirm.running"));
// Get coordinates from current point (if any) or from centre of screen
double lat = 0.0, lon = 0.0;
DataPoint point = _app.getTrackInfo().getCurrentPoint();
if (point == null)
{
lat = _app.getViewport().getCentreLatitude();
lon = _app.getViewport().getCentreLongitude();
}
else
{
lat = point.getLatitude().getDouble();
lon = point.getLongitude().getDouble();
}
// For geonames, firstly try the local language
String lang = I18nManager.getText("wikipedia.lang");
submitSearch(lat, lon, lang);
// If we didn't get anything, try a secondary language
if (_trackListModel.isEmpty() && _errorMessage == null && lang.equals("als")) {
submitSearch(lat, lon, "de");
}
// If still nothing then try english
if (_trackListModel.isEmpty() && _errorMessage == null && !lang.equals("en")) {
submitSearch(lat, lon, "en");
}
// Set status label according to error or "none found", leave blank if ok
if (_errorMessage == null && _trackListModel.isEmpty()) {
_errorMessage = I18nManager.getText("dialog.wikipedia.nonefound");
}
_statusLabel.setText(_errorMessage == null ? "" : _errorMessage);
}
/**
* Submit the search for the given parameters
* @param inLat latitude
* @param inLon longitude
* @param inLang language code to use, such as en or de
*/
private void submitSearch(double inLat, double inLon, String inLang)
{
// Example http://api.geonames.org/findNearbyWikipedia?lat=47&lng=9
String urlString = "http://api.geonames.org/findNearbyWikipedia?lat=" +
inLat + "&lng=" + inLon + "&maxRows=" + MAX_RESULTS
+ "&radius=" + MAX_DISTANCE + "&lang=" + inLang
+ "&username=" + GEONAMES_USERNAME;
// Parse the returned XML with a special handler
GetWikipediaXmlHandler xmlHandler = new GetWikipediaXmlHandler();
InputStream inStream = null;
try
{
URL url = new URL(urlString);
SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
inStream = url.openStream();
saxParser.parse(inStream, xmlHandler);
}
catch (Exception e) {
_errorMessage = e.getClass().getName() + " - " + e.getMessage();
}
// Close stream and ignore errors
if (inStream != null)
{
try {
inStream.close();
} catch (Exception e) {}
}
// Add track list to model
ArrayList<SearchResult> trackList = xmlHandler.getTrackList();
_trackListModel.addTracks(trackList, true);
// Show error message if any
if (_trackListModel.isEmpty())
{
String error = xmlHandler.getErrorMessage();
if (error != null && !error.equals(""))
{
_app.showErrorMessageNoLookup(getNameKey(), error);
_errorMessage = error;
}
}
finishedSearch();
}
}
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