/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.util;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.apache.lucene.spatial.geometry.FloatLatLng;
import org.apache.lucene.spatial.geometry.LatLng;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* Implementation of GeotargetAdapter using hostip.info web service
*
*/
public class HostIpGeotargetAdapter implements GeotargetAdapter {
public static final String URL = "http://api.hostip.info/";
@Override
public LatLng getCurrentLocation(String ip) {
GMLHandler gmlHandler = new GMLHandler();
try {
// connect to webservice
URL url = new URL(URL + "?ip=" + ip);
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
InputStream stream = urlc.getInputStream();
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser;
// parse. if error, return a null location
try {
saxParser = factory.newSAXParser();
saxParser.parse(stream, gmlHandler);
} catch (ParserConfigurationException e) {
e.printStackTrace();
return null;
} catch (SAXException e) {
e.printStackTrace();
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
return gmlHandler.getLocation();
}
/**
* This class handles the SAX parser callbacks and retrieves the pertinent
* information parsed by SAX
*
*/
private class GMLHandler extends DefaultHandler {
private static final String COORDINATES_TAG = "gml:coordinates";
private boolean coordinates;
private LatLng location;
public GMLHandler() {
coordinates = false;
}
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if (qName.equalsIgnoreCase(COORDINATES_TAG)) {
coordinates = true;
}
}
@Override
public void characters(char ch[], int start, int length)
throws SAXException {
if (coordinates) {
String coord = new String(ch, start, length);
String[] lng_lat = coord.split(",");
float lat = Float.parseFloat(lng_lat[1]);
float lng = Float.parseFloat(lng_lat[0]);
location = new FloatLatLng(lat, lng);
coordinates = false;
}
}
/**
* Returns the location parsed from the web service's response
*
* @return LatLng location in lat/long
*/
public LatLng getLocation() {
return location;
}
}
}