Java Cart .

Java Cart ControllerServlet java

	package servlet;

import cart.applicationBeans.CategoryBean;
import cart.applicationBeans.ItemBean;
import cart.applicationBeans.ItemCategoryBean;
import cart.applicationBeans.ItemInventoryBean;
import cart.dbUtils.DBConnection;
import cart.dbUtils.DBConnectionPool;
import cart.screenWranglers.BaseScreenWrangler;
import cart.screenWranglers.MainScreenWrangler;
import java.io.*;
import java.util.HashMap;
import javax.servlet.*;
import javax.servlet.http.*;

/* ControllerServlet - controls all processing
 * and holds all applicationBeans
 * author - Lawrence Truett - FluffyCat.com
 * date - May 22, 2003 - San Diego, CA
 **/
public final class ControllerServlet extends HttpServlet {
    
    private CategoryBean categoryBean;
    private ItemBean itemBean;
    private ItemCategoryBean itemCategoryBean;
    private ItemInventoryBean itemInventoryBean;
    private DBConnectionPool dbConnectionPool;
    private ServletContext servletContext;
    
    /** Initializes the servlet.
     */
    public void init(ServletConfig config) 
	  throws ServletException {
        super.init(config);
        
        servletContext = getServletContext();
        
        dbConnectionPool = new DBConnectionPool();
        DBConnection dbc = dbConnectionPool.getConnection();
        servletContext.setAttribute("dbConnectionPool", 
                                     dbConnectionPool);
        
        categoryBean = new CategoryBean(dbc);
        servletContext.setAttribute("categoryBean",  
                                     categoryBean);
        
        itemBean = new ItemBean(dbc);
        servletContext.setAttribute("itemBean", itemBean);
        
        itemCategoryBean = new ItemCategoryBean(dbc);
        servletContext.setAttribute("itemCategoryBean", 
                                     itemCategoryBean);
        
        itemInventoryBean = new ItemInventoryBean(dbc);
        servletContext.setAttribute("itemInventoryBean", 
                                     itemInventoryBean);
        
        dbConnectionPool.returnConnection(dbc);
    }
    
    /** Destroys the servlet.
     */
    public void destroy() {
        super.destroy();
    }
    
    /** Processes requests for both HTTP GET 
     *   and POST methods.
     * @param request servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, 
                                  HttpServletResponse response)
    throws ServletException, IOException {
        
        HttpSession httpSession = request.getSession();  
        
        Boolean stringSignedIn = 
            (Boolean)httpSession.getAttribute("signedIn");
        if (null == stringSignedIn) {
            httpSession.setAttribute("signedIn", new Boolean(false));
        }
        
        BaseScreenWrangler wrangler;
        wrangler = 
            (BaseScreenWrangler) httpSession.getAttribute("wrangler");
        if (null == wrangler) {
            wrangler = new MainScreenWrangler();
        }
        
        wrangler.wrangleScreen(request, servletContext);
        
        httpSession.setAttribute("wrangler", wrangler.getNextWrangler());
        
        RequestDispatcher requestDispatcher = 
            getServletContext().getRequestDispatcher(
                wrangler.getNextWrangler().getNextScreen());
        requestDispatcher.forward(request, response);
    }
    
    /** Handles the HTTP GET method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, 
                         HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Handles the HTTP POST method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, 
                          HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Returns a short description of the servlet.
     */
    public String getServletInfo() {
        String message = 
            "Controller Servlet for Shopping Cart Application, " +
            "Copyright Lawrence Truett 2003-2004, all rights reserved.";
        return message;
    }
    
}
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