Java Cart PasswordScreenWrangler java

package cart.screenWranglers;

import cart.Category;
import cart.Item;
import cart.ItemInventory;
import cart.ItemOfGroup;
import cart.ItemOfStuffWSizeColor;
import cart.applicationBeans.CategoryBean;
import cart.applicationBeans.ItemBean;
import cart.applicationBeans.ItemCategoryBean;
import cart.applicationBeans.ItemInventoryBean;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.ListIterator;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.ServletContext;

//PasswordScreenWrangler
//author - Lawrence Truett - FluffyCat.com
//date - August 13, 2003 - San Diego, CA
public class PasswordScreenWrangler extends BaseScreenWrangler {
    
    public PasswordScreenWrangler() {this("/cart/jsps/Password.jsp");}
    
    public PasswordScreenWrangler(String nextScreenIn) {
        super(nextScreenIn);
    }
    
    public void wrangleScreen(HttpServletRequest request, 
                              ServletContext servletContext) {
        
        char action = baseNextScreenSwitch(request, servletContext);
        
        if (action != 'P') {
            getNextWrangler().prepFirstScreen(request, servletContext);
        } 
    }
    
    void prepFirstScreen(HttpServletRequest request, 
                         ServletContext servletContext) {
        StringBuffer itemSubs = allScreens(request, servletContext);
        request.setAttribute("jspItem", itemSubs);
        jspCatAttribute(request);
    }
    
    StringBuffer allScreens(HttpServletRequest request, 
                            ServletContext servletContext) {
        ItemBean itemBean = 
            (ItemBean)servletContext.getAttribute("itemBean");
        ItemInventoryBean itemInventoryBean = 
            (ItemInventoryBean)servletContext.
                getAttribute("itemInventoryBean");
        StringBuffer itemSubs = new StringBuffer();
        String stringKey = request.getParameter("item");
        if (stringKey == null) {stringKey = "0";}
        request.getSession().setAttribute("lastItem", stringKey);
        long key = Long.parseLong(stringKey);
        if (key != 0) {
            Item item = itemBean.getItem(key);
            if (item instanceof ItemOfGroup) {
                itemSubs.append("Item Group");
                itemSubs.append("
Key: " + item.getKey());
                itemSubs.append("
Description: " + 
                    item.getDescription());
                long[] itemsInGroup = 
                    ((ItemOfGroup)item).getItemsInGroup();
                itemSubs.append("
Number of items in group: " + 
                    itemsInGroup.length);
                itemSubs.append("
");                
                for (int counter = 0; 
                     counter < itemsInGroup.length; 
                     counter++) {
                    Item groupItem = 
                        itemBean.getItem(itemsInGroup[counter]);
                    itemSubs.append(this.itemCommon(request,
                                                    servletContext, 
                                                    groupItem));
                    itemSubs.append("");
                }
            }
            else {
                itemSubs.append(this.itemCommon(request, 
                                                servletContext,
                                                item));
            }
            
        }
        return itemSubs;
    }
    
    StringBuffer itemCommon(HttpServletRequest request, 
                            ServletContext servletContext, 
                            Item item) {
        ItemBean itemBean = 
            (ItemBean)servletContext.getAttribute("itemBean");
        ItemInventoryBean itemInventoryBean = 
            (ItemInventoryBean)servletContext.
                getAttribute("itemInventoryBean");
        StringBuffer itemSubs = new StringBuffer();
        long key = item.getKey();
        itemSubs.append("
Key: " + item.getKey());
        itemSubs.append("
Price: " + item.getPrice());
        itemSubs.append("
Description: " + item.getDescription());
        if (item.getHasInventory()) {
            ItemInventory itemInventory = 
                itemInventoryBean.getItemInventory(key);
            long inventory = itemInventory.getInventory();
            long reserved = itemInventory.getReserved();
            itemSubs.append("
Inventory: " + inventory);
            itemSubs.append("
Reserved: " + reserved);
            if ((inventory - reserved) > 0) {
                itemSubs.append(
                    "<"+"a href="/servlet/servlet.ControllerServlet"+
                    "?action=R&subaction=R&item=");
                itemSubs.append(item.getKey() + 
                    "&amount=1">Add To Cart");
            } else {
                itemSubs.append("
Item is out of Stock");
            }
            if (item instanceof ItemOfStuffWSizeColor) {
                itemSubs.append("
Size:      " + 
                    ((ItemOfStuffWSizeColor)item).getSize());
                itemSubs.append("
Color:     " + 
                    ((ItemOfStuffWSizeColor)item).getColor());
            }
        } else {
            itemSubs.append("
Inventory: NA");
            itemSubs.append("
Reserved: NA");
            itemSubs.append(
                "<"+
                "a href="/servlet/servlet.ControllerServlet?"+
                "action=R&subaction=R&item=");
            itemSubs.append(
                item.getKey() + "&amount=1">Add To Cart");
        }
        itemSubs.append("
");
        itemSubs.append("");
        return itemSubs;
    }
}