/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package mobileAPI;
import entity.Courserates;
import entity.Courses;
import entity.Coursetag;
import entity.Enrollment;
import entity.Lecture;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import jpa.controllers.CoursesJpaController;
import jpa.controllers.EnrollmentJpaController;
import net.sf.json.JSONObject;
/**
*
* @author Geymen
*/
@WebServlet(name = "CourseDetailServlet", urlPatterns = {"/mobile/coursedetail"})
public class CourseDetailServlet extends HttpServlet {
/**
* Processes requests for both HTTP
* <code>GET</code> and
* <code>POST</code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
Integer userID;
userID = Integer.valueOf(request.getParameter("userID"));
Integer courseID;
courseID = Integer.valueOf(request.getParameter("courseID"));
// First generate a map object for keeping keys and values.
Map courseDetailMap = new HashMap();
//********************************
// Second get user related details
EnrollmentJpaController enrollmentJpaController = new EnrollmentJpaController();
Enrollment enrollment = enrollmentJpaController.findEnrollment(userID, courseID);
if (enrollment != null) {
courseDetailMap.put("userEnrolled", Boolean.TRUE);
Courserates courseRate = enrollment.getCourserates();
if (courseRate != null) {
courseDetailMap.put("userRated", Boolean.TRUE);
courseDetailMap.put("userRatePoint", new Integer(courseRate.getPoints()));
} else {
courseDetailMap.put("userRated", Boolean.FALSE);
courseDetailMap.put("userRatePoint", new Integer(-1));
}
} else {
courseDetailMap.put("userEnrolled", Boolean.FALSE);
courseDetailMap.put("userRated", Boolean.FALSE);
courseDetailMap.put("userRatePoint", new Integer(-1));
}
//********************************
// Third get basic course details
CoursesJpaController coursesJpaController = new CoursesJpaController();
Courses course = coursesJpaController.findCourses(courseID);
courseDetailMap.put("courseID", new Integer(courseID));
courseDetailMap.put("courseName", new String(course.getName()));
courseDetailMap.put("courseDescription", new String(course.getDescription()));
courseDetailMap.put("courseCreatorName", new String(course.getCreaterUserId().getName()));
//********************************
// Forth get rating
List<Enrollment> enrollmentList = enrollmentJpaController.findEnrollmentEntitiesWithCourseID(courseID);
List<Courserates> courseRatesList = new ArrayList<Courserates>();
for (Iterator<Enrollment> it = enrollmentList.iterator(); it.hasNext();) {
Enrollment tempEnrollment = it.next();
if (tempEnrollment.getCourserates() != null) {
courseRatesList.add(tempEnrollment.getCourserates());
}
}
Float totalRating = 0.f;
for (Iterator<Courserates> it = courseRatesList.iterator(); it.hasNext();) {
Courserates tempCourseRate = it.next();
totalRating += tempCourseRate.getPoints().floatValue();
}
if (!courseRatesList.isEmpty()) {
totalRating /= courseRatesList.size();
}
courseDetailMap.put("courseRating", new Float(totalRating.floatValue()));
//********************************
// Fifth get course tags
List<Coursetag> courseTagList = course.getCoursetagList();
ArrayList tagMapList = new ArrayList();
for (Iterator<Coursetag> it = courseTagList.iterator(); it.hasNext();) {
Coursetag coursetag = it.next();
Map courseTagMap = new HashMap();
courseTagMap.put("tagID", new Integer(coursetag.getTagId().getId()));
courseTagMap.put("tagName", new String(coursetag.getTagId().getTagName()));
tagMapList.add(courseTagMap);
}
courseDetailMap.put("courseTags", tagMapList);
//********************************
//Sixth get lecture list
List<Lecture> lectureList = course.getLectureList();
ArrayList lectureMapList = new ArrayList();
for (Iterator<Lecture> it = lectureList.iterator(); it.hasNext();) {
Lecture lecture = it.next();
Map lectureMap = new HashMap();
lectureMap.put("lectureID", new Integer(lecture.getId()));
lectureMap.put("lectureName", new String(lecture.getLectureName()));
lectureMap.put("lectureLink", new String(lecture.getLink()));
lectureMapList.add(lectureMap);
}
courseDetailMap.put("courseLectures", lectureMapList);
//********************************
JSONObject respondJSONObject = JSONObject.fromObject(courseDetailMap);
try {
/* TODO output your page here. You may use following sample code. */
// out.println("<!DOCTYPE html>");
// out.println("<html>");
// out.println("<head>");
// out.println("<title>Servlet CourseDetailServlet</title>");
// out.println("</head>");
// out.println("<body>");
// out.println("<h1>Servlet CourseDetailServlet at " + request.getContextPath() + "</h1>");
// out.println("</body>");
// out.println("</html>");
out.println(respondJSONObject);
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP
* <code>GET</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 doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* 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 {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}