thoerup/traininfoservice/LocateStations.java

package dk.thoerup.traininfoservice;


import java.io.IOException;
import java.io.StringWriter;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

import dk.thoerup.android.traininfo.common.StationBean;
import dk.thoerup.traininfoservice.db.StationDAO;

/**
 * Servlet implementation class LocateStations
 */
@WebServlet(urlPatterns={"/LocateStations"})
public class LocateStations extends HttpServlet {
        private static final long serialVersionUID = 1L;

        Logger logger = Logger.getLogger( LocateStations.class.toString() );

        StationDAO stationDao = new StationDAO();


        protected String transformToIntList(String input) {             
                String strings[] = input.split(",");

                StringBuffer sb = new StringBuffer();
                sb.append("(");
                for (int i = 0; i<strings.length; i++) {
                        if (i>0) {
                                sb.append(",");
                        }
                        sb.append( Integer.parseInt(strings[i])); //by doing the integer conversion we ensure that it really is a integer
                }
                sb.append(")");
                return sb.toString();           
        }


        protected StationBean getStations(HttpServletRequest req) throws SQLException {
                StationBean stations = null;
                if (req.getParameter("latitude") != null && req.getParameter("latitude") != null) {
                        
                        Statistics.getInstance().incrementStationLookupsLocation();
                        
                        double latitude = Double.parseDouble( req.getParameter("latitude") );
                        double longitude = Double.parseDouble( req.getParameter("longitude") );
                        stations = stationDao.getByLocation(latitude, longitude);

                } else if (req.getParameter("name") != null) {
                        Statistics.getInstance().incrementStationLookupsName();
                        String name = req.getParameter("name").trim();
                        stations = stationDao.getByName(name);

                } else if (req.getParameter("list") != null) {
                        Statistics.getInstance().incrementStationLookupsFavorites();
                        String list = transformToIntList( req.getParameter("list"));
                        stations = stationDao.getByList(list);
                } else if (req.getParameter("dump") != null) {
                        stations = stationDao.dumpAll();
                }
                return stations;
        }


        protected String formatStations(StationBean stations) throws ServletException {

                Serializer serializer = new Persister();

                StringWriter out = new StringWriter();

                try {
                        serializer.write(stations, out);
                } catch (Exception e) {
                        throw new ServletException(e);
                }
                
                return out.toString();
        }

        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {


                try {
                        StationBean stations = getStations(request);


                        if (stations != null){
                                String xml = formatStations(stations);

                                response.setContentType("text/xml");
                                response.getWriter().print(xml);
                        } else {
                                response.sendError(400, "not enough parameters");               
                        }


                } catch (Exception e) {                         
                        logger.log(Level.SEVERE, "Exception while finding stations", e);
                        response.sendError(500);                                                
                } 
        }

}
1	package dk.thoerup.traininfoservice;
2
3
4	import java.io.IOException;
5	import java.io.StringWriter;
6	import java.sql.SQLException;
7	import java.util.logging.Level;
8	import java.util.logging.Logger;
9
10	import javax.servlet.ServletException;
11	import javax.servlet.annotation.WebServlet;
12	import javax.servlet.http.HttpServlet;
13	import javax.servlet.http.HttpServletRequest;
14	import javax.servlet.http.HttpServletResponse;
15
16	import org.simpleframework.xml.Serializer;
17	import org.simpleframework.xml.core.Persister;
18
19	import dk.thoerup.android.traininfo.common.StationBean;
20	import dk.thoerup.traininfoservice.db.StationDAO;
21
22	/**
23	* Servlet implementation class LocateStations
24	*/
25	@WebServlet(urlPatterns={"/LocateStations"})
26	public class LocateStations extends HttpServlet {
27	private static final long serialVersionUID = 1L;
28
29	Logger logger = Logger.getLogger( LocateStations.class.toString() );
30
31	StationDAO stationDao = new StationDAO();
32
33
34	protected String transformToIntList(String input) {
35	String strings[] = input.split(",");
36
37	StringBuffer sb = new StringBuffer();
38	sb.append("(");
39	for (int i = 0; i<strings.length; i++) {
40	if (i>0) {
41	sb.append(",");
42	}
43	sb.append( Integer.parseInt(strings[i])); //by doing the integer conversion we ensure that it really is a integer
44	}
45	sb.append(")");
46	return sb.toString();
47	}
48
49
50	protected StationBean getStations(HttpServletRequest req) throws SQLException {
51	StationBean stations = null;
52	if (req.getParameter("latitude") != null && req.getParameter("latitude") != null) {
53
54	Statistics.getInstance().incrementStationLookupsLocation();
55
56	double latitude = Double.parseDouble( req.getParameter("latitude") );
57	double longitude = Double.parseDouble( req.getParameter("longitude") );
58	stations = stationDao.getByLocation(latitude, longitude);
59
60	} else if (req.getParameter("name") != null) {
61	Statistics.getInstance().incrementStationLookupsName();
62	String name = req.getParameter("name").trim();
63	stations = stationDao.getByName(name);
64
65	} else if (req.getParameter("list") != null) {
66	Statistics.getInstance().incrementStationLookupsFavorites();
67	String list = transformToIntList( req.getParameter("list"));
68	stations = stationDao.getByList(list);
69	} else if (req.getParameter("dump") != null) {
70	stations = stationDao.dumpAll();
71	}
72	return stations;
73	}
74
75
76	protected String formatStations(StationBean stations) throws ServletException {
77
78	Serializer serializer = new Persister();
79
80	StringWriter out = new StringWriter();
81
82	try {
83	serializer.write(stations, out);
84	} catch (Exception e) {
85	throw new ServletException(e);
86	}
87
88	return out.toString();
89	}
90
91	@Override
92	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
93
94
95	try {
96	StationBean stations = getStations(request);
97
98
99	if (stations != null){
100	String xml = formatStations(stations);
101
102	response.setContentType("text/xml");
103	response.getWriter().print(xml);
104	} else {
105	response.sendError(400, "not enough parameters");
106	}
107
108
109	} catch (Exception e) {
110	logger.log(Level.SEVERE, "Exception while finding stations", e);
111	response.sendError(500);
112	}
113	}
114
115	}