X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Ffunction%2FGetWikipediaFunction.java;fp=src%2Ftim%2Fprune%2Ffunction%2FGetWikipediaFunction.java;h=aa326c2a00a0ea3f116575f892da6adb433519e5;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465 diff --git a/src/tim/prune/function/GetWikipediaFunction.java b/src/tim/prune/function/GetWikipediaFunction.java new file mode 100644 index 0000000..aa326c2 --- /dev/null +++ b/src/tim/prune/function/GetWikipediaFunction.java @@ -0,0 +1,236 @@ +package tim.prune.function; + +import java.io.BufferedReader; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.net.URL; +import java.util.ArrayList; + +import javax.xml.parsers.SAXParser; +import javax.xml.parsers.SAXParserFactory; + +import tim.prune.App; +import tim.prune.I18nManager; +import tim.prune.data.DataPoint; +import tim.prune.data.Distance; +import tim.prune.data.Field; +import tim.prune.data.Latitude; +import tim.prune.data.Longitude; +import tim.prune.data.UnitSetLibrary; +import tim.prune.function.search.GenericDownloaderFunction; +import tim.prune.function.search.SearchResult; + +/** + * Function to load nearby point information from Wikipedia (and Wikimedia) + * according to the currently viewed area + */ +public class GetWikipediaFunction extends GenericDownloaderFunction +{ + /** Maximum number of results to get */ + private static final int MAX_RESULTS = 20; + /** Maximum distance from point in km */ + private static final int MAX_DISTANCE = 15; + /** Username to use for geonames queries */ + private static final String GEONAMES_USERNAME = "gpsprune"; + + + /** + * Constructor + * @param inApp App object + */ + public GetWikipediaFunction(App inApp) { + super(inApp); + } + + /** + * @return name key + */ + public String getNameKey() { + return "function.getwikipedia"; + } + + /** + * @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 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 + double lat = 0.0, lon = 0.0; + DataPoint point = _app.getTrackInfo().getCurrentPoint(); + if (point == null) + { + double[] coords = _app.getViewport().getBounds(); + lat = (coords[0] + coords[2]) / 2.0; + lon = (coords[1] + coords[3]) / 2.0; + } + else + { + lat = point.getLatitude().getDouble(); + lon = point.getLongitude().getDouble(); + } + + // Before we ask geonames online, let's get wikimedia galleries first + searchWikimediaGalleries(lat, lon); + + // For geonames, firstly try the local language + String lang = I18nManager.getText("wikipedia.lang"); + submitSearch(lat, lon, lang); + // If we didn't get anything, try a secondary language + if (_trackListModel.isEmpty() && _errorMessage == null && lang.equals("als")) { + submitSearch(lat, lon, "de"); + } + // If still nothing then try english + if (_trackListModel.isEmpty() && _errorMessage == null && !lang.equals("en")) { + submitSearch(lat, lon, "en"); + } + + // Set status label according to error or "none found", leave blank if ok + if (_errorMessage == null && _trackListModel.isEmpty()) { + _errorMessage = I18nManager.getText("dialog.wikipedia.nonefound"); + } + _statusLabel.setText(_errorMessage == null ? "" : _errorMessage); + } + + /** + * Submit the search for the given parameters + * @param inLat latitude + * @param inLon longitude + * @param inLang language code to use, such as en or de + */ + private void submitSearch(double inLat, double inLon, String inLang) + { + // Example http://api.geonames.org/findNearbyWikipedia?lat=47&lng=9 + String urlString = "http://api.geonames.org/findNearbyWikipedia?lat=" + + inLat + "&lng=" + inLon + "&maxRows=" + MAX_RESULTS + + "&radius=" + MAX_DISTANCE + "&lang=" + inLang + + "&username=" + GEONAMES_USERNAME; + // Parse the returned XML with a special handler + GetWikipediaXmlHandler xmlHandler = new GetWikipediaXmlHandler(); + InputStream inStream = null; + + try + { + URL url = new URL(urlString); + SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser(); + inStream = url.openStream(); + saxParser.parse(inStream, xmlHandler); + } + catch (Exception e) { + _errorMessage = e.getClass().getName() + " - " + e.getMessage(); + } + // Close stream and ignore errors + try { + inStream.close(); + } catch (Exception e) {} + // Add track list to model + ArrayList trackList = xmlHandler.getTrackList(); + _trackListModel.addTracks(trackList, true); + + // Show error message if any + if (_trackListModel.isEmpty()) + { + String error = xmlHandler.getErrorMessage(); + if (error != null && !error.equals("")) + { + _app.showErrorMessageNoLookup(getNameKey(), error); + _errorMessage = error; + } + } + } + + /** + * Load the selected point(s) + */ + protected void loadSelected() + { + // Find the rows selected in the table and get the corresponding coords + int numSelected = _trackTable.getSelectedRowCount(); + if (numSelected < 1) return; + int[] rowNums = _trackTable.getSelectedRows(); + for (int i=0; i= 0 && rowNum < _trackListModel.getRowCount()) + { + String lat = _trackListModel.getTrack(rowNum).getLatitude(); + String lon = _trackListModel.getTrack(rowNum).getLongitude(); + if (lat != null && lon != null) + { + DataPoint point = new DataPoint(new Latitude(lat), new Longitude(lon), null); + point.setFieldValue(Field.WAYPT_NAME, _trackListModel.getTrack(rowNum).getTrackName(), false); + _app.createPoint(point); + } + } + } + // Close the dialog + _cancelled = true; + _dialog.dispose(); + } + + /** + * Search the local wikimedia index to see if there are any galleries nearby + * @param inLat latitude + * @param inLon longitude + */ + private void searchWikimediaGalleries(double inLat, double inLon) + { + BufferedReader reader = null; + try + { + InputStream in = GetWikipediaFunction.class.getResourceAsStream("/tim/prune/function/search/wikimedia_galleries.txt"); + reader = new BufferedReader(new InputStreamReader(in)); + + ArrayList trackList = new ArrayList(); + DataPoint herePoint = new DataPoint(new Latitude(inLat, Latitude.FORMAT_DEG), new Longitude(inLon, Longitude.FORMAT_DEG), null); + // Loop through the file line by line, looking for nearby points + String line = null; + while ((line = reader.readLine()) != null) + { + String[] lineComps = line.split("\t"); + if (lineComps.length == 4) + { + DataPoint p = new DataPoint(new Latitude(lineComps[2]), new Longitude(lineComps[3]), null); + double distFromHere = Distance.convertRadiansToDistance( + DataPoint.calculateRadiansBetween(p, herePoint), UnitSetLibrary.UNITS_KILOMETRES); + if (distFromHere < MAX_DISTANCE) + { + SearchResult gallery = new SearchResult(); + gallery.setTrackName(I18nManager.getText("dialog.wikipedia.gallery") + ": " + lineComps[0]); + gallery.setDescription(lineComps[1]); + gallery.setLatitude(lineComps[2]); + gallery.setLongitude(lineComps[3]); + gallery.setWebUrl("https://commons.wikimedia.org/wiki/" + lineComps[0]); + gallery.setLength(distFromHere * 1000.0); // convert from km to m + trackList.add(gallery); + } + } + } + _trackListModel.addTracks(trackList, true); + } + catch (java.io.IOException e) { + System.err.println("Exception trying to read wikimedia file : " + e.getMessage()); + } + catch (NullPointerException e) { + System.err.println("Couldn't find wikimedia file : " + e.getMessage()); + } + finally + { + try { + reader.close(); + } + catch (Exception e) {} // ignore + } + } +}