thoerup/traininfoservice/LocateStations.java

package dk.thoerup.traininfoservice;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;
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;

/**
 * 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 List<StationBean> getStations(HttpServletRequest req) throws SQLException {
                List<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(List<StationBean> stations)  {

                StringBuffer buff = new StringBuffer();

                buff.append("<?xml version=\"1.0\" ?>\n");
                buff.append("<stations>\n");    


                for (int i=0; i<stations.size(); i++) {                 
                        StationBean station = stations.get(i);

                        buff.append("<station>\n");

                        buff.append("<id>").append( station.getId() ).append("</id>\n");
                        buff.append("<name>").append( station.getName() ) .append("</name>\n");
                        buff.append("<latitude>").append( station.getLatitude() ) .append("</latitude>\n");
                        buff.append("<longitude>").append( station.getLongitude() ) .append("</longitude>\n");                  
                        buff.append("<regional>").append( station.getRegional() != null ) .append("</regional>\n");
                        buff.append("<strain>").append( station.getStrain() != null ) .append("</strain>\n");
                        buff.append("<metro>").append( station.getMetro() != null ).append("</metro>\n");
                        buff.append("<address>").append( station.getAddress() != null ?  station.getAddress() : "").append("</address>");                               
                        buff.append("<calcdist>").append( station.getCalcdist() ) .append("</calcdist>\n");

                        buff.append("</station>\n");                            
                } 
                buff.append("</stations>\n");
                return buff.toString();
        }

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


                try {
                        List<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.IOException;
4	import java.sql.SQLException;
5	import java.util.List;
6	import java.util.logging.Level;
7	import java.util.logging.Logger;
8
9	import javax.servlet.ServletException;
10	import javax.servlet.http.HttpServlet;
11	import javax.servlet.http.HttpServletRequest;
12	import javax.servlet.http.HttpServletResponse;
13
14	/**
15	* Servlet implementation class LocateStations
16	*/
17	public class LocateStations extends HttpServlet {
18	private static final long serialVersionUID = 1L;
19
20	Logger logger = Logger.getLogger( LocateStations.class.toString() );
21
22	StationDAO stationDao = new StationDAO();
23
24
25	protected String transformToIntList(String input) {
26	String strings[] = input.split(",");
27
28	StringBuffer sb = new StringBuffer();
29	sb.append("(");
30	for (int i = 0; i<strings.length; i++) {
31	if (i>0) {
32	sb.append(",");
33	}
34	sb.append( Integer.parseInt(strings[i])); //by doing the integer conversion we ensure that it really is a integer
35	}
36	sb.append(")");
37	return sb.toString();
38	}
39
40
41	protected List<StationBean> getStations(HttpServletRequest req) throws SQLException {
42	List<StationBean> stations = null;
43	if (req.getParameter("latitude") != null && req.getParameter("latitude") != null) {
44
45	Statistics.getInstance().incrementStationLookupsLocation();
46
47	double latitude = Double.parseDouble( req.getParameter("latitude") );
48	double longitude = Double.parseDouble( req.getParameter("longitude") );
49	stations = stationDao.getByLocation(latitude, longitude);
50
51	} else if (req.getParameter("name") != null) {
52	Statistics.getInstance().incrementStationLookupsName();
53	String name = req.getParameter("name").trim();
54	stations = stationDao.getByName(name);
55
56	} else if (req.getParameter("list") != null) {
57	Statistics.getInstance().incrementStationLookupsFavorites();
58	String list = transformToIntList( req.getParameter("list"));
59	stations = stationDao.getByList(list);
60	}
61	return stations;
62	}
63
64
65	protected String formatStations(List<StationBean> stations) {
66
67	StringBuffer buff = new StringBuffer();
68
69	buff.append("<?xml version=\"1.0\" ?>\n");
70	buff.append("<stations>\n");
71
72
73	for (int i=0; i<stations.size(); i++) {
74	StationBean station = stations.get(i);
75
76	buff.append("<station>\n");
77
78	buff.append("<id>").append( station.getId() ).append("</id>\n");
79	buff.append("<name>").append( station.getName() ) .append("</name>\n");
80	buff.append("<latitude>").append( station.getLatitude() ) .append("</latitude>\n");
81	buff.append("<longitude>").append( station.getLongitude() ) .append("</longitude>\n");
82	buff.append("<regional>").append( station.getRegional() != null ) .append("</regional>\n");
83	buff.append("<strain>").append( station.getStrain() != null ) .append("</strain>\n");
84	buff.append("<metro>").append( station.getMetro() != null ).append("</metro>\n");
85	buff.append("<address>").append( station.getAddress() != null ? station.getAddress() : "").append("</address>");
86	buff.append("<calcdist>").append( station.getCalcdist() ) .append("</calcdist>\n");
87
88	buff.append("</station>\n");
89	}
90	buff.append("</stations>\n");
91	return buff.toString();
92	}
93
94	@Override
95	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
96
97
98	try {
99	List<StationBean> stations = getStations(request);
100
101
102	if (stations != null){
103	String xml = formatStations(stations);
104
105	response.setContentType("text/xml");
106	response.getWriter().print(xml);
107	} else {
108	response.sendError(400, "not enough parameters");
109	}
110
111
112	} catch (Exception e) {
113	logger.log(Level.SEVERE, "Exception while finding stations", e);
114	response.sendError(500);
115	}
116	}
117
118	}