/**
* The Search Availabilty Reservation Page
* @author Morozan Ion & Sandu Andreea
*/
package servlets;
import classes.Availability;
import classes.DAO;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;
import java.io.IOException;
import java.io.StringReader;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.xml.sax.InputSource;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
public class SearchHotel extends HttpServlet {
private String checkin;
private String checkout;
private String room_size;
private ArrayList<String> rooms_id = new ArrayList<String>();
private ArrayList<String> kind = new ArrayList<String>();
private ArrayList<String> description = new ArrayList<String>();
/**
* Handles the HTTP <code>GET</code> method.
* @param req servlet request
* @param resp servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
getServletContext().getRequestDispatcher("/WEB-INF/pay.jsp").forward(req, resp);
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
checkin = request.getParameter("adate");
checkout = request.getParameter("ddate");
room_size = request.getParameter("room_size");
/*current date*/
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = new Date();
/* instance of database */
DAO dao = DAO.getInstance();
/* all fields are mandatory to search a room */
if (checkin.isEmpty() || checkout.isEmpty() || room_size.isEmpty()) {
/*otherwise error message is sent */
request.setAttribute("errorMessage", "<font size=\"3\" "
+ "face=\"arial\" color=\"red\">"
+ "You must fill all fields!");
RequestDispatcher rd = request.getRequestDispatcher("pay.jsp");
rd.forward(request, response);
/* and of course the dates must be in a logical order */
} else if ((checkin.compareTo(checkout) > 0)
|| (checkin.compareTo(dateFormat.format(date).toString()) <= 0)) {
request.setAttribute("errorMessage", "<font size=\"2\" "
+ "face=\"arial\" color=\"red\">"
+ "Wrong Date! </font> ");
RequestDispatcher rd = request.getRequestDispatcher("pay.jsp");
rd.forward(request, response);
} else {
/* GET method */
/* create the query link*/
String link = "http://mdwhotel.appspot.com/api/v1/reservation/?start=";
link += checkin + "&end=" + checkout + "&nr=" + room_size;
Client client = Client.create();
WebResource webResource = client.resource(link);
webResource.accept("application/xml");
/* invoke the specific metgod(GET) for getting the avialable rooms*/
String resp = webResource.get(String.class);
/*parsing the String to XML format and extract important fields*/
StringToXML(resp);
/* create new availability req*/
Availability available = new Availability(checkin, checkout, room_size, rooms_id, kind, description);
dao.put(available);
response.sendRedirect("bookHotel.jsp");
}
}
/**
* Parse the xml file and extract the desired fields
* @param xmlString = xml file receive from the remote application
*/
protected void StringToXML(String xmlString) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder;
try {
/*clear arrays if they contain information from previous GET*/
rooms_id.clear();
kind.clear();
description.clear();
builder = factory.newDocumentBuilder();
// Use String reader
Document doc = builder.parse(new InputSource(new StringReader(xmlString)));
doc.getDocumentElement().normalize();
NodeList nList = doc.getElementsByTagName("room");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
rooms_id.add(getTagValue("id", eElement));
kind.add(getTagValue("kind_of_the_room", eElement));
description.add(getTagValue("description", eElement));
}
}
} catch (Exception e) {
System.out.println("Eroare la parsare XML ");
}
}
/*
* Extract the Tag and what contains
*/
private static String getTagValue(String sTag, Element eElement) {
NodeList nlList = eElement.getElementsByTagName(sTag).item(0).getChildNodes();
Node nValue = (Node) nlList.item(0);
return nValue.getNodeValue();
}
}