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
  30
  31         /**
  32          * Constructor
  33          * @param inApp App object
  34          */
  35         public GetWikipediaFunction(App inApp) {
  36                 super(inApp);
  37         }
  38
  39         /**
  40          * @return name key
  41          */
  42         public String getNameKey() {
  43                 return "function.getwikipedia";
  44         }
  45
  46         /**
  47          * @param inColNum index of column, 0 or 1
  48          * @return key for this column
  49          */
  50         protected String getColumnKey(int inColNum)
  51         {
  52                 if (inColNum == 0) return "dialog.wikipedia.column.name";
  53                 return "dialog.wikipedia.column.distance";
  54         }
  55
  56
  57         /**
  58          * Run method to call geonames in separate thread
  59          */
  60         public void run()
  61         {
  62                 _statusLabel.setText(I18nManager.getText("confirm.running"));
  63                 // Get coordinates from current point (if any) or from centre of screen
  64                 double lat = 0.0, lon = 0.0;
  65                 DataPoint point = _app.getTrackInfo().getCurrentPoint();
  66                 if (point == null)
  67                 {
  68                         double[] coords = _app.getViewport().getBounds();
  69                         lat = (coords[0] + coords[2]) / 2.0;
  70                         lon = (coords[1] + coords[3]) / 2.0;
  71                 }
  72                 else {
  73                         lat = point.getLatitude().getDouble();
  74                         lon = point.getLongitude().getDouble();
  75                 }
  76
  77                 String descMessage = "";
  78                 InputStream inStream = null;
  79
  80                 // Example http://ws.geonames.org/findNearbyWikipedia?lat=47&lng=9
  81                 String urlString = "http://ws.geonames.org/findNearbyWikipedia?lat=" +
  82                         lat + "&lng=" + lon + "&maxRows=" + MAX_RESULTS
  83                         + "&radius=" + MAX_DISTANCE + "&lang=" + I18nManager.getText("wikipedia.lang");
  84                 // Parse the returned XML with a special handler
  85                 GetWikipediaXmlHandler xmlHandler = new GetWikipediaXmlHandler();
  86                 try
  87                 {
  88                         URL url = new URL(urlString);
  89                         SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
  90                         inStream = url.openStream();
  91                         saxParser.parse(inStream, xmlHandler);
  92                 }
  93                 catch (Exception e) {
  94                         descMessage = e.getClass().getName() + " - " + e.getMessage();
  95                 }
  96                 // Close stream and ignore errors
  97                 try {
  98                         inStream.close();
  99                 } catch (Exception e) {}
 100                 // Add track list to model
 101                 ArrayList<GpsiesTrack> trackList = xmlHandler.getTrackList();
 102                 _trackListModel.addTracks(trackList);
 103
 104                 // Set status label according to error or "none found", leave blank if ok
 105                 if (descMessage.equals("") && (trackList == null || trackList.size() == 0)) {
 106                         descMessage = I18nManager.getText("dialog.gpsies.nonefound");
 107                 }
 108                 _statusLabel.setText(descMessage);
 109         }
 110
 111         /**
 112          * Load the selected track or point
 113          */
 114         protected void loadSelected()
 115         {
 116                 // Find the row selected in the table and get the corresponding track
 117                 int rowNum = _trackTable.getSelectedRow();
 118                 if (rowNum >= 0 && rowNum < _trackListModel.getRowCount())
 119                 {
 120                         String coords = _trackListModel.getTrack(rowNum).getDownloadLink();
 121                         String[] latlon = coords.split(",");
 122                         if (latlon.length == 2)
 123                         {
 124                                 DataPoint point = new DataPoint(new Latitude(latlon[0]), new Longitude(latlon[1]), null);
 125                                 point.setFieldValue(Field.WAYPT_NAME, _trackListModel.getTrack(rowNum).getTrackName(), false);
 126                                 _app.createPoint(point);
 127                         }
 128                 }
 129                 // Close the dialog
 130                 _cancelled = true;
 131                 _dialog.dispose();
 132         }
 133 }