package rewardsadmin.web.customservlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import rewards.Dining;
import rewards.RewardConfirmation;
import rewards.RewardNetwork;
import rewardsadmin.app.Reward;
import rewardsadmin.app.RewardLookupService;
/**
* Servlet for managing rewards.
*
* This servlet is mapped to the "/reward" path and understands several different types of requests:
* <ul>
* <li>GET /new: display a form to the user to create a new reward.
* <li>POST /new: process the user's submission to create the reward.
* <li>GET /show/${reward.confirmationNumber}: display the details of the reward with the provided confirmation number
* </li>
* </ul>
* A user interface controller. Part of the presentation layer. A client of the application layer.
*/
public class RewardServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = -3036929972925241617L;
private RewardNetwork rewardNetwork;
private RewardLookupService rewardLookupService;
// TODO - lookup the rewardNetwork and rewardLookupService on servlet initialization
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
if (request.getPathInfo().equals("/new")) {
// forward to a form JSP to start a new reward dialog
request.getRequestDispatcher("/WEB-INF/customservlet/reward/new.jsp").forward(request, response);
} else if (request.getPathInfo().startsWith("/show/")) {
// locate the reward with the confirmation number provided in the request
Reward reward = rewardLookupService.lookupReward(extractConfirmationNumber(request));
request.setAttribute("reward", reward);
// forward to a JSP to show the reward details
request.getRequestDispatcher("/WEB-INF/customservlet/reward/show.jsp").forward(request, response);
}
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
if (request.getPathInfo().equals("/new")) {
// start of create reward processing - extract submitted user input from the request
String creditCardNumber = request.getParameter("creditCardNumber");
String amount = request.getParameter("amount");
String merchantNumber = request.getParameter("merchantNumber");
// prepare the input needed by the application service
Dining dining = Dining.createDining(amount, creditCardNumber, merchantNumber);
// invoke the application
RewardConfirmation confirmation = rewardNetwork.rewardAccountFor(dining);
// redirect to the lookup servlet for displaying the confirmed reward details
response.sendRedirect("show/" + confirmation.getConfirmationNumber());
}
}
private String extractConfirmationNumber(HttpServletRequest request) {
int lastSlash = request.getPathInfo().lastIndexOf('/');
return request.getPathInfo().substring(lastSlash + 1);
}
}