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package com.venky.geo;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.logging.Logger;
import com.venky.xml.XMLDocument;
import com.venky.xml.XMLElement;
/**
*
* @author venky
*/
public class GeoCoder {
private static final Map availableSps = new HashMap();
static {
registerGeoSP("yahoo",new Yahoo());
registerGeoSP("google",new Google());
registerGeoSP("openstreetmap",new Nominatim());
}
private static void registerGeoSP(String sp,GeoSP geoSP){
availableSps.put(sp, geoSP);
}
private GeoSP preferredServiceProvider = null;
public GeoCoder(String preferedSP){
preferredServiceProvider = availableSps.get(preferedSP);
}
public GeoCoder(){
this(null);
}
public void fillGeoInfo(String address,GeoLocation location){
GeoLocation result = getLocation(address);
if (result != null){
location.setLatitude(result.getLatitude());
location.setLongitude(result.getLongitude());
}
}
private static final GeoLocationBuilder builder = new DefaultGeoLocationBuilder();
Collection sps = null ;
public GeoLocation getLocation(String address){
if (preferredServiceProvider == null ){
sps = Arrays.asList(availableSps.get("yahoo"),availableSps.get("google"),availableSps.get("openstreetmap"));
}else {
sps = Arrays.asList(preferredServiceProvider);
}
for (GeoSP sp : sps){
GeoLocation loc = sp.getLocation(address);
if (loc != null){
Logger.getLogger(GeoCoder.class.getName()).info("Lat,Lon found using " + sp.getClass().getSimpleName());
return loc;
}
}
return null;
}
private static interface GeoSP {
public GeoLocation getLocation(String address);
}
private static class Yahoo implements GeoSP {
private static final String WSURL = "http://where.yahooapis.com/geocode?appid=vvNzzZ_V34HjikIGzQZ2Q6.ErIvyP7F7UOVVcbzmWH.2G84oCDRwE8_7cunqsBnjYY1x&q=";
@Override
public GeoLocation getLocation(String address) {
try {
String url = WSURL + URLEncoder.encode(address,"UTF-8");
URL u = new URL(url);
URLConnection connection = u.openConnection();
XMLDocument doc = XMLDocument.getDocumentFor(connection.getInputStream());
String status = doc.getDocumentRoot().getChildElement("Error").getNodeValue();
if ( "0".equals(status)){
Logger.getLogger(getClass().getName()).info("URL:" + url);
XMLElement result = doc.getDocumentRoot().getChildElement("Result");
String radius = result.getChildElement("radius").getNodeValue();
if (Double.valueOf(radius) < 5000){
String latitude = result.getChildElement("latitude").getNodeValue();
String longitude = result.getChildElement("longitude").getNodeValue();
return builder.create(Float.valueOf(latitude), Float.valueOf(longitude));
}
}
}catch (IOException ex){
Logger.getLogger(getClass().getName()).warning(ex.getMessage());
}
return null;
}
}
private static class Google implements GeoSP {
private static final String WSURL = "http://maps.googleapis.com/maps/api/geocode/xml?sensor=false&address=";
public GeoLocation getLocation(String address) {
try {
String url = WSURL + URLEncoder.encode(address,"UTF-8");
URL u = new URL(url);
URLConnection connection = u.openConnection();
XMLDocument doc = XMLDocument.getDocumentFor(connection.getInputStream());
XMLElement status = doc.getDocumentRoot().getChildElement("status");
if ("OK".equals(status.getNodeValue())){
Logger.getLogger(getClass().getName()).info("URL:" + url);
XMLElement location = doc.getDocumentRoot().getChildElement("result").getChildElement("geometry").getChildElement("location");
float lat=-1;
float lng=-1 ;
for (Iterator nodeIterator =location.getChildElements() ; nodeIterator.hasNext();){
XMLElement node = nodeIterator.next();
if (node.getNodeName().equals("lat")){
lat = Float.valueOf(node.getChildren().next().getNodeValue());
}else if (node.getNodeName().equals("lng")){
lng = Float.valueOf(node.getChildren().next().getNodeValue());
}
}
return builder.create(lat,lng);
}
} catch (IOException e) {
Logger.getLogger(getClass().getName()).warning(e.getMessage());
}
return null;
}
}
private static class Nominatim implements GeoSP {
private static final String WSURL = "http://nominatim.openstreetmap.org/search?format=xml&polygon=0&q=";
public GeoLocation getLocation(String address) {
try {
String url = WSURL + URLEncoder.encode(address,"UTF-8");
URL u = new URL(url);
URLConnection connection = u.openConnection();
XMLDocument doc = XMLDocument.getDocumentFor(connection.getInputStream());
XMLElement place = doc.getDocumentRoot().getChildElement("place");
if (place != null){
Logger.getLogger(getClass().getName()).info("URL:" + url);
float lat= Float.valueOf(place.getAttribute("lat"));
float lng= Float.valueOf(place.getAttribute("lon")) ;
return builder.create(lat,lng);
}
} catch (IOException e) {
Logger.getLogger(getClass().getName()).warning(e.getMessage());
}
return null;
}
}
}