content: package tim.prune.function.search;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  import java.util.ArrayList;
  
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  
  import org.xml.sax.SAXException;
  import tim.prune.App;
  import tim.prune.I18nManager;
  import tim.prune.data.DataPoint;
  
  /**
   * Function to load information about geocaches nearby to the current point
   * using the service at opencaching.de
   */
  public class SearchOpenCachingDeFunction extends GenericDownloaderFunction
  {
  	/** Maximum distance from point in km */
  	private static final int MAX_DISTANCE = 50;
  
  
  	/**
  	 * Constructor
  	 * @param inApp App object
  	 */
  	public SearchOpenCachingDeFunction(App inApp) {
  		super(inApp);
  	}
  
  	/**
  	 * @return name key
  	 */
  	public String getNameKey() {
  		return "function.searchopencachingde";
  	}
  
  	/**
  	 * @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 call service in a separate thread
  	 */
  	public void run()
  	{
  		_statusLabel.setText(I18nManager.getText("confirm.running"));
  		// Get coordinates from current point
  		DataPoint point = _app.getTrackInfo().getCurrentPoint();
  		if (point == null) {
  			return;
  		}
  
  		final double lat = point.getLatitude().getDouble();
  		final double lon = point.getLongitude().getDouble();
  		submitSearch(lat, lon);
  
  		// Set status label according to error or "none found", leave blank if ok
  		if (_errorMessage == null && _trackListModel.isEmpty()) {
  			_errorMessage = I18nManager.getText("dialog.geocaching.nonefound");
  		}
  		_statusLabel.setText(_errorMessage == null ? "" : _errorMessage);
  		finishedSearch();
  	}
  
  	/**
  	 * Submit the search for the given parameters
  	 * @param inLat latitude
  	 * @param inLon longitude
  	 */
  	private void submitSearch(double inLat, double inLon)
  	{
  		// The only parameters are lat and long from the current point
  		String urlString = "https://opencaching.de/search.php?searchto=searchbydistance&showresult=1"
  			+ "&output=XML&sort=bydistance&lat=" + inLat
  			+ "&lon=" + inLon + "&distance=" + MAX_DISTANCE + "&unit=km";
  		// Parse the returned XML with a special handler
  		OpenCachingDeXmlHandler xmlHandler = new OpenCachingDeXmlHandler();
  
  		try
  		{
  			URL url = new URL(urlString);
  			SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
  			try (InputStream inStream = url.openStream()) {
  				saxParser.parse(inStream, xmlHandler);
  			}
  		} catch (SAXException | IOException | ParserConfigurationException ignored) {
  		}
  
  		// Add track list to model
  		ArrayList<SearchResult> trackList = xmlHandler.getTrackList();
  		_trackListModel.addTracks(trackList);
  	}
  }
  