tim/prune/function/GetWikipediaFunction.java

   1 package tim.prune.function;
   2
   3 import java.io.InputStream;
   4 import java.net.URL;
   5 import java.util.ArrayList;
   6
   7 import javax.xml.parsers.SAXParser;
   8 import javax.xml.parsers.SAXParserFactory;
   9
  10 import tim.prune.App;
  11 import tim.prune.I18nManager;
  12 import tim.prune.data.DataPoint;
  13 import tim.prune.data.Field;
  14 import tim.prune.data.Latitude;
  15 import tim.prune.data.Longitude;
  16 import tim.prune.function.gpsies.GenericDownloaderFunction;
  17 import tim.prune.function.gpsies.GpsiesTrack;
  18
  19 /**
  20  * Function to load nearby point information from Wikipedia
  21  * according to the currently viewed area
  22  */
  23 public class GetWikipediaFunction extends GenericDownloaderFunction
  24 {
  25         /** Maximum number of results to get */
  26         private static final int MAX_RESULTS = 20;
  27         /** Maximum distance from point in km */
  28         private static final int MAX_DISTANCE = 15;
  29         /** Username to use for geonames queries */
  30         private static final String GEONAMES_USERNAME = "gpsprune";
  31
  32
  33         /**
  34          * Constructor
  35          * @param inApp App object
  36          */
  37         public GetWikipediaFunction(App inApp) {
  38                 super(inApp);
  39         }
  40
  41         /**
  42          * @return name key
  43          */
  44         public String getNameKey() {
  45                 return "function.getwikipedia";
  46         }
  47
  48         /**
  49          * @param inColNum index of column, 0 or 1
  50          * @return key for this column
  51          */
  52         protected String getColumnKey(int inColNum)
  53         {
  54                 if (inColNum == 0) return "dialog.wikipedia.column.name";
  55                 return "dialog.wikipedia.column.distance";
  56         }
  57
  58
  59         /**
  60          * Run method to call geonames in separate thread
  61          */
  62         public void run()
  63         {
  64                 _statusLabel.setText(I18nManager.getText("confirm.running"));
  65                 // Get coordinates from current point (if any) or from centre of screen
  66                 double lat = 0.0, lon = 0.0;
  67                 DataPoint point = _app.getTrackInfo().getCurrentPoint();
  68                 if (point == null)
  69                 {
  70                         double[] coords = _app.getViewport().getBounds();
  71                         lat = (coords[0] + coords[2]) / 2.0;
  72                         lon = (coords[1] + coords[3]) / 2.0;
  73                 }
  74                 else {
  75                         lat = point.getLatitude().getDouble();
  76                         lon = point.getLongitude().getDouble();
  77                 }
  78
  79                 String descMessage = "";
  80                 InputStream inStream = null;
  81
  82                 // Example http://api.geonames.org/findNearbyWikipedia?lat=47&lng=9
  83                 String urlString = "http://api.geonames.org/findNearbyWikipedia?lat=" +
  84                         lat + "&lng=" + lon + "&maxRows=" + MAX_RESULTS
  85                         + "&radius=" + MAX_DISTANCE + "&lang=" + I18nManager.getText("wikipedia.lang")
  86                         + "&username=" + GEONAMES_USERNAME;
  87                 // Parse the returned XML with a special handler
  88                 GetWikipediaXmlHandler xmlHandler = new GetWikipediaXmlHandler();
  89                 try
  90                 {
  91                         URL url = new URL(urlString);
  92                         SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
  93                         inStream = url.openStream();
  94                         saxParser.parse(inStream, xmlHandler);
  95                 }
  96                 catch (Exception e) {
  97                         descMessage = e.getClass().getName() + " - " + e.getMessage();
  98                 }
  99                 // Close stream and ignore errors
 100                 try {
 101                         inStream.close();
 102                 } catch (Exception e) {}
 103                 // Add track list to model
 104                 ArrayList<GpsiesTrack> trackList = xmlHandler.getTrackList();
 105                 _trackListModel.addTracks(trackList);
 106
 107                 // Set status label according to error or "none found", leave blank if ok
 108                 if (descMessage.equals("") && (trackList == null || trackList.size() == 0)) {
 109                         descMessage = I18nManager.getText("dialog.gpsies.nonefound");
 110                 }
 111                 _statusLabel.setText(descMessage);
 112                 // Show error message if any
 113                 if (trackList == null || trackList.size() == 0) {
 114                         String error = xmlHandler.getErrorMessage();
 115                         if (error != null && !error.equals("")) {
 116                                 _app.showErrorMessageNoLookup(getNameKey(), error);
 117                         }
 118                 }
 119         }
 120
 121
 122         /**
 123          * Load the selected track or point
 124          */
 125         protected void loadSelected()
 126         {
 127                 // Find the row selected in the table and get the corresponding track
 128                 int rowNum = _trackTable.getSelectedRow();
 129                 if (rowNum >= 0 && rowNum < _trackListModel.getRowCount())
 130                 {
 131                         String coords = _trackListModel.getTrack(rowNum).getDownloadLink();
 132                         String[] latlon = coords.split(",");
 133                         if (latlon.length == 2)
 134                         {
 135                                 DataPoint point = new DataPoint(new Latitude(latlon[0]), new Longitude(latlon[1]), null);
 136                                 point.setFieldValue(Field.WAYPT_NAME, _trackListModel.getTrack(rowNum).getTrackName(), false);
 137                                 _app.createPoint(point);
 138                         }
 139                 }
 140                 // Close the dialog
 141                 _cancelled = true;
 142                 _dialog.dispose();
 143         }
 144 }