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	torben	292	package dk.thoerup.traininfoservice;
2
3	torben	1060	import java.io.ByteArrayOutputStream;
4	torben	292	import java.io.IOException;
5			import java.sql.SQLException;
6	torben	1102
7	torben	348	import java.util.logging.Level;
8			import java.util.logging.Logger;
9	torben	292
10	torben	1102
11	torben	292	import javax.servlet.ServletException;
12			import javax.servlet.http.HttpServlet;
13			import javax.servlet.http.HttpServletRequest;
14			import javax.servlet.http.HttpServletResponse;
15
16	torben	1060	import org.simpleframework.xml.Serializer;
17			import org.simpleframework.xml.core.Persister;
18
19	torben	1061	import dk.thoerup.android.traininfo.common.StationBean;
20
21	torben	292	/**
22			* Servlet implementation class LocateStations
23			*/
24	torben	1080
25	torben	292	public class LocateStations extends HttpServlet {
26			private static final long serialVersionUID = 1L;
27
28	torben	348	Logger logger = Logger.getLogger( LocateStations.class.toString() );
29	torben	431
30	torben	588	StationDAO stationDao = new StationDAO();
31	torben	431
32	torben	588
33	torben	431	protected String transformToIntList(String input) {
34			String strings[] = input.split(",");
35	torben	588
36	torben	431	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	torben	347	}
47	torben	322
48	torben	431
49	torben	1060	protected StationBean getStations(HttpServletRequest req) throws SQLException {
50			StationBean stations = null;
51	torben	431	if (req.getParameter("latitude") != null && req.getParameter("latitude") != null) {
52	torben	711
53			Statistics.getInstance().incrementStationLookupsLocation();
54
55	torben	431	double latitude = Double.parseDouble( req.getParameter("latitude") );
56			double longitude = Double.parseDouble( req.getParameter("longitude") );
57	torben	588	stations = stationDao.getByLocation(latitude, longitude);
58
59	torben	431	} else if (req.getParameter("name") != null) {
60	torben	711	Statistics.getInstance().incrementStationLookupsName();
61	torben	588	String name = req.getParameter("name").trim();
62			stations = stationDao.getByName(name);
63	torben	431
64			} else if (req.getParameter("list") != null) {
65	torben	711	Statistics.getInstance().incrementStationLookupsFavorites();
66	torben	431	String list = transformToIntList( req.getParameter("list"));
67	torben	588	stations = stationDao.getByList(list);
68			}
69			return stations;
70	torben	347	}
71
72
73	torben	1060	protected String formatStations(StationBean stations) throws ServletException {
74	torben	347
75	torben	1060	Serializer serializer = new Persister();
76	torben	347
77	torben	1060	ByteArrayOutputStream out = new ByteArrayOutputStream();
78	torben	431
79	torben	1060	try {
80			serializer.write(stations, out);
81			} catch (Exception e) {
82			throw new ServletException(e);
83			}
84
85			return out.toString();
86	torben	292	}
87
88	torben	425	@Override
89	torben	292	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
90	torben	347
91	torben	431	try {
92	torben	1060	StationBean stations = getStations(request);
93	torben	347
94
95	torben	588	if (stations != null){
96			String xml = formatStations(stations);
97
98	torben	431	response.setContentType("text/xml");
99			response.getWriter().print(xml);
100			} else {
101			response.sendError(400, "not enough parameters");
102			}
103	torben	347
104
105	torben	431	} catch (Exception e) {
106			logger.log(Level.SEVERE, "Exception while finding stations", e);
107			response.sendError(500);
108	torben	588	}
109	torben	292	}
110
111			}