David Soto

@WebServlet(name = "CatalogController", urlPatterns = {"/item"})
public class CatalogController extends HttpServlet {


    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        ItemDB itemDB = new ItemDB();
        List<Item> allItems = itemDB.getItems();
        String requestedItemCode = request.getParameter("itemCode");
        Item  itsAllGoodBro = null;
        String url = "/item.jsp";

        for(Item item:allItems)
        {
            if(validateParameter(requestedItemCode))
            {
                if(requestedItemCode.equals(item.getItemCode()))
                {
                    itsAllGoodBro = item;
                    break;
                }
            }

        }

        if(itsAllGoodBro != null)
        {
            request.setAttribute("item", itsAllGoodBro);
        } else
        {
            url = "/categories.jsp";
            request.setAttribute("allItems", allItems);
            for (Item item : allItems) {
                request.setAttribute(item.getItemCode(), item);
            }
        }

        getServletContext().getRequestDispatcher(url).forward(request, response);

    }

    public boolean validateParameter(String requestedItemCode)
    {
        boolean validInput = true;
        if (requestedItemCode == null || requestedItemCode == "") {
            validInput = false;
        }
        return validInput;
    }

// <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>

}