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package dk.thoerup.traininfoservice.banedk;
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import java.io.IOException;
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import java.sql.Connection;
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import java.sql.ResultSet;
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import java.sql.Statement;
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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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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.transform.OutputKeys;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import org.w3c.dom.DOMImplementation;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import dk.thoerup.circuitbreaker.CircuitBreakerException;
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import dk.thoerup.traininfoservice.DBConnection;
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/**
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* Servlet implementation class DepartureServlet
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*/
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public class DepartureServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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Logger logger = Logger.getLogger( DepartureServlet.class.getName() );
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DepartureFetcher fetcher;
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TransformerFactory transformerFactory = TransformerFactory.newInstance();
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DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
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@Override
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public void init() throws ServletException {
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super.init();
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boolean useTempSite = Boolean.parseBoolean( getServletContext().getInitParameter("usetempsite") );
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int cacheTimeout = Integer.parseInt( getServletContext().getInitParameter("cache_timeout") );
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logger.info( "DepartureServlet, use temp site=" + useTempSite + ", cache=" + cacheTimeout);
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fetcher = new DepartureFetcher(useTempSite, cacheTimeout);
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}
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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if (req.getParameter("station") == null) {
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resp.sendError(400, "not enough parameters");
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return;
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}
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int station = Integer.parseInt( req.getParameter("station") );
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String format = req.getParameter("format");
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List<DepartureBean> beans;
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String stationName = getStationName(station);
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try {
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beans = fetcher.cachedLookupDepartures(station);
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} catch (java.io.IOException ioe) {
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logger.warning("Read failed, station="+station + ". " + ioe.getMessage() );
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resp.sendError(500);
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return;
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} catch (CircuitBreakerException cbe) {
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logger.warning("Circuitbreaker - failing fast");
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resp.sendError(500);
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return;
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} catch (Exception e) {
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logger.log(Level.WARNING, "Unknown exception, station=" +station, e);
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resp.sendError(500);
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return;
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}
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resp.setDateHeader("Expires", 0);
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resp.setHeader("Cache-Control", "no-cache, must-revalidate");
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if (format.equalsIgnoreCase("xml")) {
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resp.setContentType("text/xml");
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resp.getWriter().print( formatXml(beans, stationName) );
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} else if (format.equalsIgnoreCase("html")) {
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req.setAttribute("stationname", stationName );
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req.setAttribute("departurebeans", beans);
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req.setAttribute("stationID", station );
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getServletContext().getRequestDispatcher("/ViewDepartures.jsp").forward(req,resp);
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} else {
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throw new ServletException("Unknown format");
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}
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}
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protected String formatXml(List<DepartureBean> beans, String stationName) throws ServletException{
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String xml = "";
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try {
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DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
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DOMImplementation impl = builder.getDOMImplementation();
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Document doc = impl.createDocument(null,null,null);
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Element root = doc.createElement("departureinfo");
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root.setAttribute("station", stationName);
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for (DepartureBean departure : beans) {
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Element train = doc.createElement("train");
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Element time = doc.createElement("time");
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time.setTextContent( departure.getTime() );
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train.appendChild(time);
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Element updated = doc.createElement("updated");
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updated.setTextContent( String.valueOf(departure.getUpdated()) );
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train.appendChild(updated);
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Element trainNumber = doc.createElement("trainnumber");
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trainNumber.setTextContent( departure.getTrainNumber() );
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train.appendChild(trainNumber);
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Element destination = doc.createElement("destination");
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destination.setTextContent( departure.getDestination());
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train.appendChild(destination);
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Element origin = doc.createElement("origin");
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origin.setTextContent( departure.getOrigin() );
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train.appendChild(origin);
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Element location= doc.createElement("location");
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location.setTextContent( departure.getLocation() );
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train.appendChild(location);
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Element status = doc.createElement("status");
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status.setTextContent( departure.getStatus() );
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train.appendChild(status);
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Element note = doc.createElement("note");
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note.setTextContent( departure.getNote() );
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train.appendChild(note);
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root.appendChild(train);
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}
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doc.appendChild(root);
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DOMSource domSource = new DOMSource(doc);
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Transformer transformer = transformerFactory.newTransformer();
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//transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
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transformer.setOutputProperty(OutputKeys.METHOD, "xml");
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transformer.setOutputProperty(OutputKeys.ENCODING,"ISO-8859-1");
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transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
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transformer.setOutputProperty(OutputKeys.INDENT, "yes");
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java.io.StringWriter sw = new java.io.StringWriter();
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StreamResult sr = new StreamResult(sw);
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transformer.transform(domSource, sr);
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xml = sw.toString();
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} catch (Exception e) {
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throw new ServletException(e);
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}
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return xml;
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}
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protected String getStationName(int stationID) {
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String station = "";
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Connection conn = null;
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try {
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conn = DBConnection.getConnection();
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Statement stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID);
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if (rs.next()) {
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station = rs.getString(1);
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}
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} catch (Exception e) {
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} finally {
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try {
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if (conn != null && !conn.isClosed())
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conn.close();
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} catch (Exception e) {}
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}
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return station;
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}
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}
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