tim/prune/function/SearchOsmPoisFunction.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.Coordinate;
  13 import tim.prune.data.DataPoint;
  14 import tim.prune.data.Distance;
  15 import tim.prune.data.Field;
  16 import tim.prune.data.Latitude;
  17 import tim.prune.data.Longitude;
  18 import tim.prune.function.search.GenericDownloaderFunction;
  19 import tim.prune.function.search.SearchResult;
  20
  21 /**
  22  * Function to load nearby point information from OSM
  23  */
  24 public class SearchOsmPoisFunction extends GenericDownloaderFunction
  25 {
  26         /** Maximum distance from point in m */
  27         private static final int MAX_DISTANCE = 250;
  28         /** Coordinates to search for */
  29         private double _searchLatitude = 0.0, _searchLongitude = 0.0;
  30
  31
  32         /**
  33          * Constructor
  34          * @param inApp App object
  35          */
  36         public SearchOsmPoisFunction(App inApp) {
  37                 super(inApp);
  38         }
  39
  40         /**
  41          * @return name key
  42          */
  43         public String getNameKey() {
  44                 return "function.searchosmpois";
  45         }
  46
  47         /**
  48          * @param inColNum index of column, 0 or 1
  49          * @return key for this column
  50          */
  51         protected String getColumnKey(int inColNum)
  52         {
  53                 if (inColNum == 0) return "dialog.osmpois.column.name";
  54                 return "dialog.osmpois.column.type";
  55         }
  56
  57
  58         /**
  59          * Run method to get the nearby points in a separate thread
  60          */
  61         public void run()
  62         {
  63                 _statusLabel.setText(I18nManager.getText("confirm.running"));
  64                 // Get coordinates from current point (if any) or from centre of screen
  65                 DataPoint point = _app.getTrackInfo().getCurrentPoint();
  66                 if (point == null)
  67                 {
  68                         double[] coords  = _app.getViewport().getBounds();
  69                         _searchLatitude  = (coords[0] + coords[2]) / 2.0;
  70                         _searchLongitude = (coords[1] + coords[3]) / 2.0;
  71                 }
  72                 else
  73                 {
  74                         _searchLatitude  = point.getLatitude().getDouble();
  75                         _searchLongitude = point.getLongitude().getDouble();
  76                 }
  77
  78                 // Submit search (language not an issue here)
  79                 submitSearch(_searchLatitude, _searchLongitude);
  80
  81                 // Set status label according to error or "none found", leave blank if ok
  82                 if (_errorMessage == null && _trackListModel.isEmpty()) {
  83                         _errorMessage = I18nManager.getText("dialog.osmpois.nonefound");
  84                 }
  85                 _statusLabel.setText(_errorMessage == null ? "" : _errorMessage);
  86         }
  87
  88         /**
  89          * Submit the search for the given parameters
  90          * @param inLat latitude
  91          * @param inLon longitude
  92          */
  93         private void submitSearch(double inLat, double inLon)
  94         {
  95                 String coords = "around:" + MAX_DISTANCE + "," + inLat + "," + inLon;
  96                 String urlString = "http://overpass-api.de/api/interpreter?data=("
  97                         + "node(" + coords + ")[\"amenity\"][\"name\"];"
  98                         + "node(" + coords + ")[\"railway\"][\"name\"];"
  99                         + "node(" + coords + ")[\"highway\"][\"name\"];"
 100                         + ");out%20qt;";
 101                 //System.out.println(urlString);
 102                 // Parse the returned XML with a special handler
 103                 SearchOsmPoisXmlHandler xmlHandler = new SearchOsmPoisXmlHandler();
 104                 InputStream inStream = null;
 105
 106                 try
 107                 {
 108                         URL url = new URL(urlString);
 109                         SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
 110                         inStream = url.openStream();
 111                         saxParser.parse(inStream, xmlHandler);
 112                 }
 113                 catch (Exception e) {
 114                         _errorMessage = e.getClass().getName() + " - " + e.getMessage();
 115                 }
 116                 // Close stream and ignore errors
 117                 try {
 118                         inStream.close();
 119                 } catch (Exception e) {}
 120
 121                 // Calculate distances for each returned point
 122                 DataPoint searchPoint = new DataPoint(new Latitude(_searchLatitude, Coordinate.FORMAT_DECIMAL_FORCE_POINT),
 123                         new Longitude(_searchLongitude, Coordinate.FORMAT_DECIMAL_FORCE_POINT), null);
 124                 for (SearchResult result : xmlHandler.getPointList())
 125                 {
 126                         Latitude pointLat = new Latitude(result.getLatitude());
 127                         Longitude pointLon = new Longitude(result.getLongitude());
 128                         DataPoint foundPoint = new DataPoint(pointLat, pointLon, null);
 129                         double dist = DataPoint.calculateRadiansBetween(searchPoint, foundPoint);
 130                         result.setLength(Distance.convertRadiansToDistance(dist));
 131                 }
 132
 133                 // TODO: maybe limit number of results using MAX_RESULTS
 134                 // Add track list to model
 135                 ArrayList<SearchResult> pointList = xmlHandler.getPointList();
 136                 _trackListModel.addTracks(pointList, true);
 137                 _trackListModel.setShowPointTypes(true);
 138
 139                 // Show error message if any
 140                 if (_trackListModel.isEmpty())
 141                 {
 142                         String error = xmlHandler.getErrorMessage();
 143                         if (error != null && !error.equals(""))
 144                         {
 145                                 _app.showErrorMessageNoLookup(getNameKey(), error);
 146                                 _errorMessage = error;
 147                         }
 148                 }
 149         }
 150
 151         /**
 152          * Load the selected point(s)
 153          */
 154         protected void loadSelected()
 155         {
 156                 // Find the rows selected in the table and get the corresponding coords
 157                 int numSelected = _trackTable.getSelectedRowCount();
 158                 if (numSelected < 1) return;
 159                 int[] rowNums = _trackTable.getSelectedRows();
 160                 for (int i=0; i<numSelected; i++)
 161                 {
 162                         int rowNum = rowNums[i];
 163                         if (rowNum >= 0 && rowNum < _trackListModel.getRowCount())
 164                         {
 165                                 String lat = _trackListModel.getTrack(rowNum).getLatitude();
 166                                 String lon = _trackListModel.getTrack(rowNum).getLongitude();
 167                                 if (lat != null && lon != null)
 168                                 {
 169                                         DataPoint point = new DataPoint(new Latitude(lat), new Longitude(lon), null);
 170                                         point.setFieldValue(Field.WAYPT_NAME, _trackListModel.getTrack(rowNum).getTrackName(), false);
 171                                         _app.createPoint(point);
 172                                 }
 173                         }
 174                 }
 175                 // Close the dialog
 176                 _cancelled = true;
 177                 _dialog.dispose();
 178         }
 179 }