Wikipedia Layer for Nutiteq 3D maps SDK - task to download data

WikipediaTask.java

package com.nutiteq.app.layers;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.ReentrantLock;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.nutiteq.components.ImmutableMapPos;
import com.nutiteq.components.MapPos;
import com.nutiteq.geometry.Marker;
import com.nutiteq.log.Log;
import com.nutiteq.projections.Projection;
import com.nutiteq.style.MarkerStyle;
import com.nutiteq.style.StyleSet;
import com.nutiteq.tasks.Task;
import com.nutiteq.ui.DefaultLabel;
import com.nutiteq.utils.IOUtils;
import com.vividsolutions.jts.geom.Envelope;

public class WikipediaTask implements Task {

    private final WikipediaLayer markerLayer;

    private final ReentrantLock modifyLock;

    private final Envelope envelope;

    private final int zoom;

    private StyleSet<MarkerStyle> style;

    private Projection projection;

    public WikipediaTask(Projection projection, WikipediaLayer markerLayer,
            ReentrantLock modifyLock, Envelope envelope, int zoom, StyleSet<MarkerStyle> style) {
        this.markerLayer = markerLayer;
        this.modifyLock = modifyLock;
        this.envelope = envelope;
        this.zoom = zoom;
        this.style = style;
        this.projection = projection;
    }

    @Override
    public void run() {
        modifyLock.lock();
        List<Marker> newVisibleElementsList = downloadMarkers(envelope);
        modifyLock.unlock();

        Log.debug("adding wikipedia elements N="+newVisibleElementsList.size());
        markerLayer.setVisibleElementsList(newVisibleElementsList);
    }

    private List<Marker> downloadMarkers(Envelope envelope) {
        Log.debug("download wiki "+envelope+" zoom "+zoom);
        MapPos bottomLeft = projection.fromInternal((float) envelope.getMinX(), (float) envelope.getMinY());
        MapPos topRight = projection.fromInternal((float) envelope.getMaxX(), (float) envelope.getMaxY());
        Log.debug("bottomLeft "+projection.toWgs84(bottomLeft.x,bottomLeft.y)+" topRight "+projection.toWgs84(topRight.x,topRight.y));
        String bbox = "west="+projection.toWgs84(bottomLeft.x,bottomLeft.y).x+"&south="+projection.toWgs84(bottomLeft.x,bottomLeft.y).y+"&east="+projection.toWgs84(topRight.x,topRight.y).x+"&north="+projection.toWgs84(topRight.x,topRight.y).y; 
        List<Marker> pois = new ArrayList<Marker>();
        
        // Working sample: http://api.geonames.org/wikipediaBoundingBoxJSON?north=north=44.1&south=-9.9&east=-22.4&west=55.2&username=demo
        String path = "http://api.geonames.org/wikipediaBoundingBoxJSON?"+bbox+"&maxRows=30&username=nutiteq";
        Log.debug("wiki "+path);
        try {
            URL url = new URL(path);
            InputStream urlInputStream = url.openConnection().getInputStream();
            
            // parse data from JSON
            JSONObject json = new JSONObject(new String(IOUtils.readFully(urlInputStream)));

            JSONArray geonames = json.getJSONArray("geonames");
            for(int i = 0; i < geonames.length(); i++){
                JSONObject geoname = geonames.getJSONObject(i);
                float lon = Float.parseFloat(geoname.getString("lng"));
                float lat = Float.parseFloat(geoname.getString("lat"));
                String title = geoname.getString("title");
                String feature = "";
                String countryCode = "";
                try{
                    // optional fields
                    feature = geoname.getString("feature");
                    countryCode = " in "+geoname.getString("countryCode");
                } catch (JSONException e) {
                    Log.debug(e.getMessage());
                }
                ImmutableMapPos location = projection.fromWgs84(lon, lat);
                Marker poi = new Marker(location, new DefaultLabel(
                        title, feature+countryCode), this.style, geoname);

                poi.calculateInternalPos(projection);
                poi.setActiveStyle(zoom);
                pois.add(poi);
          //      Log.debug("added wiki marker "+title+ " "+lat+" "+lon);

            }
            Log.debug("added "+geonames.length()+" wikipedia markers");
        } catch (IOException ex) {
            Log.error(ex.getMessage());
        } catch (JSONException e) {
            Log.error(e.getMessage());
            e.printStackTrace();
        } finally {
        }
        
        return pois;
    }

    @Override
    public boolean isCancelable() {
        return true;
    }
}