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) {
                        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) {
                        String name = req.getParameter("name").trim();
                        stations = stationDao.getByName(name);

                } else if (req.getParameter("list") != null) {
                        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	torben	292	package dk.thoerup.traininfoservice;
2
3			import java.io.IOException;
4			import java.sql.SQLException;
5	torben	588	import java.util.List;
6	torben	348	import java.util.logging.Level;
7			import java.util.logging.Logger;
8	torben	292
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	torben	348	Logger logger = Logger.getLogger( LocateStations.class.toString() );
21	torben	431
22	torben	588	StationDAO stationDao = new StationDAO();
23	torben	431
24	torben	588
25	torben	431	protected String transformToIntList(String input) {
26			String strings[] = input.split(",");
27	torben	588
28	torben	431	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	torben	347	}
39	torben	322
40	torben	431
41	torben	588	protected List<StationBean> getStations(HttpServletRequest req) throws SQLException {
42			List<StationBean> stations = null;
43	torben	431	if (req.getParameter("latitude") != null && req.getParameter("latitude") != null) {
44			double latitude = Double.parseDouble( req.getParameter("latitude") );
45			double longitude = Double.parseDouble( req.getParameter("longitude") );
46	torben	588	stations = stationDao.getByLocation(latitude, longitude);
47
48	torben	431	} else if (req.getParameter("name") != null) {
49	torben	588	String name = req.getParameter("name").trim();
50			stations = stationDao.getByName(name);
51	torben	431
52			} else if (req.getParameter("list") != null) {
53			String list = transformToIntList( req.getParameter("list"));
54	torben	588	stations = stationDao.getByList(list);
55			}
56			return stations;
57	torben	347	}
58
59
60	torben	588	protected String formatStations(List<StationBean> stations) {
61	torben	347
62	torben	292	StringBuffer buff = new StringBuffer();
63	torben	347
64			buff.append("<?xml version=\"1.0\" ?>\n");
65			buff.append("<stations>\n");
66	torben	431
67	torben	347
68	torben	588	for (int i=0; i<stations.size(); i++) {
69			StationBean station = stations.get(i);
70	torben	292
71	torben	588	buff.append("<station>\n");
72	torben	347
73	torben	588	buff.append("<id>").append( station.getId() ).append("</id>\n");
74			buff.append("<name>").append( station.getName() ) .append("</name>\n");
75			buff.append("<latitude>").append( station.getLatitude() ) .append("</latitude>\n");
76			buff.append("<longitude>").append( station.getLongitude() ) .append("</longitude>\n");
77			buff.append("<regional>").append( station.getRegional() != null ) .append("</regional>\n");
78			buff.append("<strain>").append( station.getStrain() != null ) .append("</strain>\n");
79			buff.append("<metro>").append( station.getMetro() != null ).append("</metro>\n");
80			buff.append("<address>").append( station.getAddress() != null ? station.getAddress() : "").append("</address>");
81			buff.append("<calcdist>").append( station.getCalcdist() ) .append("</calcdist>\n");
82
83			buff.append("</station>\n");
84			}
85	torben	292	buff.append("</stations>\n");
86			return buff.toString();
87			}
88
89	torben	425	@Override
90	torben	292	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
91	torben	347
92	torben	588
93	torben	431	try {
94	torben	588	List<StationBean> stations = getStations(request);
95	torben	347
96
97	torben	588	if (stations != null){
98			String xml = formatStations(stations);
99
100	torben	431	response.setContentType("text/xml");
101			response.getWriter().print(xml);
102			} else {
103			response.sendError(400, "not enough parameters");
104			}
105	torben	347
106
107	torben	431	} catch (Exception e) {
108			logger.log(Level.SEVERE, "Exception while finding stations", e);
109			response.sendError(500);
110	torben	588	}
111	torben	292	}
112
113			}