thoerup/traininfoservice/LocateStations.java

package dk.thoerup.traininfoservice;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.sql.SQLException;

import java.util.logging.Level;
import java.util.logging.Logger;


import javax.servlet.ServletException;
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;

/**
 * Servlet implementation class 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);
                }
                return stations;
        }


        protected String formatStations(StationBean stations) throws ServletException {

                Serializer serializer = new Persister();

                ByteArrayOutputStream out = new ByteArrayOutputStream();

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