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package dk.thoerup.traininfoservice; |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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import java.sql.SQLException; |
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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.annotation.WebServlet; |
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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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import org.simpleframework.xml.Serializer; |
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import org.simpleframework.xml.core.Persister; |
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|
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/** |
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* Servlet implementation class LocateStations |
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*/ |
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@WebServlet(urlPatterns={"/LocateStations"}) |
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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 StationBean getStations(HttpServletRequest req) throws SQLException { |
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StationBean stations = null; |
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if (req.getParameter("latitude") != null && req.getParameter("latitude") != null) { |
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Statistics.getInstance().incrementStationLookupsLocation(); |
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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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Statistics.getInstance().incrementStationLookupsName(); |
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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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Statistics.getInstance().incrementStationLookupsFavorites(); |
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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(StationBean stations) throws ServletException { |
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Serializer serializer = new Persister(); |
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ByteArrayOutputStream out = new ByteArrayOutputStream(); |
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try { |
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serializer.write(stations, out); |
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} catch (Exception e) { |
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throw new ServletException(e); |
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} |
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return out.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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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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} |