Android Open Source - SmartNavi Nominatim P O I Provider

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License

The source code is released under:

Apache License

Java Source Code

package org.osmdroid.bonuspack.location;
/*w ww.ja  v a  2  s.c om*/
import java.net.URLEncoder;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.osmdroid.bonuspack.utils.BonusPackHelper;
import org.osmdroid.util.BoundingBoxE6;
import org.osmdroid.util.GeoPoint;
import android.graphics.Bitmap;
import android.util.Log;

/**
 * POI Provider using Nominatim service. <br>
 * See http://wiki.openstreetmap.org/wiki/Nominatim<br>
 * and http://open.mapquestapi.com/nominatim/<br>
 * 
 * @author M.Kergall
 */
public class NominatimPOIProvider {
/*
  As the doc lacks a lot of features, source code may help:
   https://trac.openstreetmap.org/browser/applications/utils/nominatim/website/search.php

     * featuretype= to select on feature type (country, city, state, settlement)<br>
     * format=jsonv2 to get a place_rank<br>
     * offset= to offset the result ?... <br>
     * polygon=1 to get the border of the poi as a polygon<br>
     * nearlat & nearlon = ???<br>
     * routewidth/69 and routewidth/30 ???<br>
*/  
  public static final String MAPQUEST_POI_SERVICE = "http://open.mapquestapi.com/nominatim/v1/";
  public static final String NOMINATIM_POI_SERVICE = "http://nominatim.openstreetmap.org/";
  protected String mService;
  
  public NominatimPOIProvider(){
    mService = NOMINATIM_POI_SERVICE;
  }
  
  public void setService(String serviceUrl){
    mService = serviceUrl;
  }
  
  private StringBuffer getCommonUrl(String facility, int maxResults){
    StringBuffer urlString = new StringBuffer(mService);
    urlString.append("search?");
    urlString.append("format=json");
    urlString.append("&q=["+URLEncoder.encode(facility)+"]");
    urlString.append("&limit="+maxResults);
    urlString.append("&bounded=1");
    return urlString;
  }
  
  private String getUrlInside(BoundingBoxE6 bb, String type, int maxResults){
    StringBuffer urlString = getCommonUrl(type, maxResults);
    urlString.append("&viewbox="+bb.getLonWestE6()*1E-6+","
        +bb.getLatNorthE6()*1E-6+","
        +bb.getLonEastE6()*1E-6+","
        +bb.getLatSouthE6()*1E-6);
    return urlString.toString();
  }
  
  private String getUrlCloseTo(GeoPoint p, String type, 
      int maxResults, double maxDistance){
    int maxD = (int)(maxDistance*1E6);
    BoundingBoxE6 bb = new BoundingBoxE6(p.getLatitudeE6()+maxD, 
        p.getLongitudeE6()+maxD,
        p.getLatitudeE6()-maxD,
        p.getLongitudeE6()-maxD);
    return getUrlInside(bb, type, maxResults);
  }
  
  /**
   * @param url full URL request
   * @return the list of POI, of null if technical issue. 
   */
  public ArrayList<POI> getThem(String url){
    Log.d(BonusPackHelper.LOG_TAG, "NominatimPOIProvider:get:"+url);
    String jString = BonusPackHelper.requestStringFromUrl(url);
    if (jString == null) {
      Log.e(BonusPackHelper.LOG_TAG, "NominatimPOIProvider: request failed.");
      return null;
    }
    try {
      JSONArray jPlaceIds = new JSONArray(jString);
      int n = jPlaceIds.length();
      ArrayList<POI> pois = new ArrayList<POI>(n);
      Bitmap thumbnail = null;
      for (int i=0; i<n; i++){
        JSONObject jPlace = jPlaceIds.getJSONObject(i);
        POI poi = new POI(POI.POI_SERVICE_NOMINATIM);
        poi.mId = jPlace.optLong("osm_id");
        poi.mLocation = new GeoPoint(jPlace.getDouble("lat"), 
            jPlace.getDouble("lon"));
        poi.mCategory = jPlace.optString("class");
        poi.mType = jPlace.getString("type");
        poi.mDescription = jPlace.optString("display_name");
        poi.mThumbnailPath = jPlace.optString("icon", null);
          if (i==0 && poi.mThumbnailPath != null) {
            //first POI, and we have a thumbnail: load it
            thumbnail = BonusPackHelper.loadBitmap(poi.mThumbnailPath);
        }
          poi.mThumbnail = thumbnail;
        pois.add(poi);
      }
      return pois;
    } catch (JSONException e) {
      e.printStackTrace();
      return null;
    }
  }

   /**
   * @param position
   * @param facility a Nominatim facility. 
   * Note that Nominatim facility search uses Special Phrases instead of OSM tags. 
   * See http://wiki.openstreetmap.org/wiki/Nominatim/Special_Phrases
   * and http://wiki.openstreetmap.org/wiki/Nominatim/Special_Phrases/EN
   * or http://code.google.com/p/osmbonuspack/source/browse/trunk/OSMBonusPackDemo/res/values/poi_tags.xml
   * @param maxResults the maximum number of POI returned. 
   * Note that in any case, Nominatim will have an absolute maximum of 50. 
   * @param maxDistance to the position, in degrees. 
   * Note that it is used to build a bounding box around the position, not a circle. 
   * @return the list of POI, null if technical issue. 
   */
  public ArrayList<POI> getPOICloseTo(GeoPoint position, String facility, 
      int maxResults, double maxDistance){
    String url = getUrlCloseTo(position, facility, maxResults, maxDistance);
    return getThem(url);
  }
  
  /**
   * @param boundingBox
   * @param facility Nominatim facility
   * @param maxResults
   * @return list of POIs, null if technical issue. 
   */
  public ArrayList<POI> getPOIInside(BoundingBoxE6 boundingBox, String facility, int maxResults){
    String url = getUrlInside(boundingBox, facility, maxResults);
    return getThem(url);
  }
  
  /**
   * @param path
   * Warning: a very long path may cause a failure due to the url to be too long. 
   * Using a simplified route may help (see Road.getRouteLow()). 
   * @param facility Nominatim feature
   * @param maxResults
   * @param maxWidth to the path. Certainly not in degrees. Probably in km. 
   * @return list of POIs, null if technical issue. 
   */
  public ArrayList<POI> getPOIAlong(ArrayList<GeoPoint> path, String facility, 
    int maxResults, double maxWidth){
    StringBuffer url = getCommonUrl(facility, maxResults);
    url.append("&routewidth="+maxWidth);
    url.append("&route=");
    boolean isFirst = true;
    for (GeoPoint p:path){
      if (isFirst)
        isFirst = false;
      else 
        url.append(",");
      String lat = Double.toString(p.getLatitudeE6()*1E-6);
      lat = lat.substring(0, Math.min(lat.length(), 7));
      String lon = Double.toString(p.getLongitudeE6()*1E-6);
      lon = lon.substring(0, Math.min(lon.length(), 7));
      url.append(lat+","+lon);
        //limit the size of url as much as possible, as post method is not supported. 
    }
    return getThem(url.toString());
  }
}

Java Source Code List

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