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package dk.thoerup.traininfoservice; |
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import java.io.IOException; |
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import java.sql.SQLException; |
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import java.util.List; |
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import java.util.logging.Level; |
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import java.util.logging.Logger; |
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import javax.servlet.ServletException; |
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import javax.servlet.http.HttpServlet; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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/** |
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* Servlet implementation class LocateStations |
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*/ |
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public class LocateStations extends HttpServlet { |
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private static final long serialVersionUID = 1L; |
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Logger logger = Logger.getLogger( LocateStations.class.toString() ); |
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StationDAO stationDao = new StationDAO(); |
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protected String transformToIntList(String input) { |
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String strings[] = input.split(","); |
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StringBuffer sb = new StringBuffer(); |
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sb.append("("); |
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for (int i = 0; i<strings.length; i++) { |
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if (i>0) { |
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sb.append(","); |
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} |
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sb.append( Integer.parseInt(strings[i])); //by doing the integer conversion we ensure that it really is a integer |
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} |
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sb.append(")"); |
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return sb.toString(); |
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} |
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protected List<StationBean> getStations(HttpServletRequest req) throws SQLException { |
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List<StationBean> stations = null; |
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if (req.getParameter("latitude") != null && req.getParameter("latitude") != null) { |
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double latitude = Double.parseDouble( req.getParameter("latitude") ); |
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double longitude = Double.parseDouble( req.getParameter("longitude") ); |
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stations = stationDao.getByLocation(latitude, longitude); |
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} else if (req.getParameter("name") != null) { |
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String name = req.getParameter("name").trim(); |
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stations = stationDao.getByName(name); |
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} else if (req.getParameter("list") != null) { |
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String list = transformToIntList( req.getParameter("list")); |
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stations = stationDao.getByList(list); |
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} |
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return stations; |
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} |
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protected String formatStations(List<StationBean> stations) { |
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StringBuffer buff = new StringBuffer(); |
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buff.append("<?xml version=\"1.0\" ?>\n"); |
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buff.append("<stations>\n"); |
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for (int i=0; i<stations.size(); i++) { |
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StationBean station = stations.get(i); |
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buff.append("<station>\n"); |
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buff.append("<id>").append( station.getId() ).append("</id>\n"); |
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buff.append("<name>").append( station.getName() ) .append("</name>\n"); |
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buff.append("<latitude>").append( station.getLatitude() ) .append("</latitude>\n"); |
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buff.append("<longitude>").append( station.getLongitude() ) .append("</longitude>\n"); |
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buff.append("<regional>").append( station.getRegional() != null ) .append("</regional>\n"); |
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buff.append("<strain>").append( station.getStrain() != null ) .append("</strain>\n"); |
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buff.append("<metro>").append( station.getMetro() != null ).append("</metro>\n"); |
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buff.append("<address>").append( station.getAddress() != null ? station.getAddress() : "").append("</address>"); |
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buff.append("<calcdist>").append( station.getCalcdist() ) .append("</calcdist>\n"); |
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buff.append("</station>\n"); |
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} |
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buff.append("</stations>\n"); |
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return buff.toString(); |
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} |
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@Override |
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { |
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try { |
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List<StationBean> stations = getStations(request); |
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if (stations != null){ |
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String xml = formatStations(stations); |
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response.setContentType("text/xml"); |
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response.getWriter().print(xml); |
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} else { |
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response.sendError(400, "not enough parameters"); |
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} |
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} catch (Exception e) { |
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logger.log(Level.SEVERE, "Exception while finding stations", e); |
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response.sendError(500); |
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} |
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} |
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} |
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