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/ch7/catalog/ControllerHelper.java /ch7/catalog/ControllerHelper.java

package ch7.catalog;

import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import shared.HelperBaseCh6;
import shared.ButtonMethod;
import shared.HibernateHelper;

public class ControllerHelper extends HelperBaseCh6 {

private CatalogItem item = new CatalogItem();
    private ShoppingCart<CatalogItem> cart =
            new ShoppingCart<CatalogItem>();

public ControllerHelper(HttpServletRequest request,
            HttpServletResponse response) {
        super(request, response);
    }

static public void initHibernate(boolean create) {
        HibernateHelper.initSessionFactory(CatalogItem.class);
    }

public Object getItem() {
        return item;
    }

public Object getCart() {
        return cart;
    }

public void copyFromSession(Object sessionHelper) {
        if (sessionHelper.getClass() == this.getClass()) {
            item = ((ControllerHelper) sessionHelper).item;
            cart = ((ControllerHelper) sessionHelper).cart;
        }
    }

public String jspLocation(String page) {
        return "/WEB-INF/classes/ch7/catalog/" + page;
    }

@ButtonMethod(isDefault = true)
    public String methodDefault() {
        //Make all the catalog items available
        //from the BrowseLoop.jsp.
        java.util.List list = HibernateHelper.getListData(CatalogItem.class);
        request.setAttribute("allItems", list);
        return jspLocation("BrowseLoop.jsp");
    }

@ButtonMethod(buttonName = "addCart")
    public String methodAddCart() {
        cart.addItem(item);
        item = new CatalogItem();
        return methodDefault();
    }

@ButtonMethod(buttonName = "emptyCart")
    public String methodEmptyCart() {
        cart.resetItems();
        return methodDefault();
    }

@ButtonMethod(buttonName = "viewItem")
    public String methodViewItem() {
        fillBeanFromRequest(item);
        if (item.getItemId() != null) {
            Object dbObj = HibernateHelper.getFirstMatch(item, "itemId",
                    item.getItemId());
            if (dbObj != null) {
                item = (CatalogItem) dbObj;
            }
        }
        return methodDefault();
    }

@ButtonMethod(buttonName = "viewCart")
    public String methodViewCart() {
        return jspLocation("Cart.jsp");
    }

@ButtonMethod(buttonName = "processCart")
    public String methodProcessCart() {
        for (CatalogItem anItem : cart.getItems()) {
            cart.addTotal(anItem.getPrice());
            cart.incrCount();
        }
        return jspLocation("ProcessCart.jsp");
    }

@Override
    protected void doGet()
            throws IOException, ServletException {
        if (HibernateHelper.testDB(response)) {
            addHelperToSession("helper", SessionData.IGNORE);

//BrowseLoop.jsp is only page that a
            //GET request will see.
            String address = methodDefault();

request.getRequestDispatcher(address).forward(request, response);
        }
    }

@Override
    protected void doPost()
            throws ServletException, IOException {
        if (HibernateHelper.testDB(response)) {
            addHelperToSession("helper", SessionData.READ);

String address = executeButtonMethod();

request.getRequestDispatcher(address).forward(request, response);
        }
    }
}

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