Package dispatcher

Source Code of dispatcher.Dispatcher

/*
* Copyright (c) 2002 Sun Microsystems, Inc.  All rights reserved.  U.S.
* Government Rights - Commercial software.  Government users are subject
* to the Sun Microsystems, Inc. standard license agreement and
* applicable provisions of the FAR and its supplements.  Use is subject
* to license terms. 
*
* This distribution may include materials developed by third parties.
* Sun, Sun Microsystems, the Sun logo, Java and J2EE are trademarks
* or registered trademarks of Sun Microsystems, Inc. in the U.S. and
* other countries. 
*
* Copyright (c) 2002 Sun Microsystems, Inc. Tous droits reserves.
*
* Droits du gouvernement americain, utilisateurs gouvernementaux - logiciel
* commercial. Les utilisateurs gouvernementaux sont soumis au contrat de
* licence standard de Sun Microsystems, Inc., ainsi qu'aux dispositions
* en vigueur de la FAR (Federal Acquisition Regulations) et des
* supplements a celles-ci.  Distribue par des licences qui en
* restreignent l'utilisation.
*
* Cette distribution peut comprendre des composants developpes par des
* tierces parties. Sun, Sun Microsystems, le logo Sun, Java et J2EE
* sont des marques de fabrique ou des marques deposees de Sun
* Microsystems, Inc. aux Etats-Unis et dans d'autres pays.
*
*/

package dispatcher;

import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import cart.ShoppingCart;
import database.*;
import exception.*;

public class Dispatcher extends HttpServlet {
   public void doGet(HttpServletRequest request, HttpServletResponse response) {
      String bookId = null;
      String clear = null;
      BookDetails book = null;
      BookDBAO bookDBAO = (BookDBAO)getServletContext().getAttribute("bookDBAO");
      HttpSession session = request.getSession();
      String selectedScreen = request.getServletPath();
      ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
      if (cart == null) {
        cart = new ShoppingCart();
        session.setAttribute("cart", cart);
      }
      if (selectedScreen.equals("/bookcatalog")) {
        bookId = request.getParameter("Add");
        if (!bookId.equals("")) {
          try {
            book = bookDBAO.getBookDetails(bookId);
            cart.add(bookId, book);
          } catch (BookNotFoundException ex) {
            // not possible
          }
        }
      } else if (selectedScreen.equals("/bookshowcart")) {
        bookId =request.getParameter("Remove");
        if (bookId != null) {
           cart.remove(bookId);         
        }
       
        clear = request.getParameter("Clear");
        if (clear != null && clear.equals("clear")) {
           cart.clear();
        }

      } else if (selectedScreen.equals("/bookreceipt")) {
      // Update the inventory
        try {
          bookDBAO.buyBooks(cart);
        } catch (OrderException ex) {
          selectedScreen ="/bookordererror";
        }
    }

    String screen = selectedScreen + ".jsp";

    try {
        request.getRequestDispatcher(screen).forward(request, response);
    } catch(Exception ex) {
        ex.printStackTrace();
    }
  }

  public void doPost(HttpServletRequest request, HttpServletResponse response) {    
    String screen = request.getServletPath() + ".jsp";
    try {
        request.getRequestDispatcher(screen).forward(request, response);
    } catch(Exception ex) {
        ex.printStackTrace();
    }
  }
}
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