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package tim.prune.function.search;
import java.io.InputStream;
import java.net.MalformedURLException;
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;
import tim.prune.data.Distance;
import tim.prune.data.Latitude;
import tim.prune.data.Longitude;
import tim.prune.data.Unit;
/**
* Function to load nearby point information from OSM
*/
public class SearchOsmPoisFunction extends GenericDownloaderFunction
{
/** Maximum distance from point in m */
private static final int MAX_DISTANCE = 250;
/** Coordinates to search for */
private double _searchLatitude = 0.0, _searchLongitude = 0.0;
/**
* Constructor
* @param inApp App object
*/
public SearchOsmPoisFunction(App inApp) {
super(inApp);
}
/**
* @return name key
*/
public String getNameKey() {
return "function.searchosmpois";
}
/**
* @param inColNum index of column, 0 or 1
* @return key for this column
*/
protected String getColumnKey(int inColNum)
{
if (inColNum == 0) return "dialog.osmpois.column.name";
return "dialog.osmpois.column.type";
}
/**
* 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
DataPoint point = _app.getTrackInfo().getCurrentPoint();
if (point == null)
{
_searchLatitude = _app.getViewport().getCentreLatitude();
_searchLongitude = _app.getViewport().getCentreLongitude();
}
else
{
_searchLatitude = point.getLatitude().getDouble();
_searchLongitude = point.getLongitude().getDouble();
}
// Submit search (language not an issue here)
submitSearch(_searchLatitude, _searchLongitude);
// Set status label according to error or "none found", leave blank if ok
if (_errorMessage == null && _trackListModel.isEmpty()) {
_errorMessage = I18nManager.getText("dialog.osmpois.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)
{
String coords = "around:" + MAX_DISTANCE + "," + inLat + "," + inLon;
String urlString = "http://overpass-api.de/api/interpreter?data=("
+ "node(" + coords + ")[\"amenity\"][\"name\"];"
+ "node(" + coords + ")[\"railway\"][\"name\"];"
+ "node(" + coords + ")[\"highway\"][\"name\"];"
+ ");out%20qt;";
//System.out.println(urlString);
// Parse the returned XML with a special handler
SearchOsmPoisXmlHandler xmlHandler = new SearchOsmPoisXmlHandler();
try
{
URL url = new URL(urlString);
SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
try (InputStream inStream = url.openStream()) {
saxParser.parse(inStream, xmlHandler);
} catch (Exception e) {
_errorMessage = e.getClass().getName() + " - " + e.getMessage();
}
} catch (MalformedURLException | SAXException | ParserConfigurationException ignored) {
}
// Calculate distances for each returned point
DataPoint searchPoint = new DataPoint(Latitude.make(_searchLatitude),
Longitude.make(_searchLongitude));
Unit distUnit = getConfig().getUnitSet().getDistanceUnit();
for (SearchResult result : xmlHandler.getPointList())
{
DataPoint foundPoint = new DataPoint(Latitude.make(result.getLatitude()),
Longitude.make(result.getLongitude()));
double dist = DataPoint.calculateRadiansBetween(searchPoint, foundPoint);
result.setLength(Distance.convertRadiansToDistance(dist, distUnit));
}
// TODO: maybe limit number of results using MAX_RESULTS
// Add track list to model
ArrayList<SearchResult> pointList = xmlHandler.getPointList();
_trackListModel.addTracks(pointList, true);
_trackListModel.setShowPointTypes(true);
}
}
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