test

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package com.bittercode.util;
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import java.io.PrintWriter;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpSession;
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import com.bittercode.model.UserRole;
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/*
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 * Store UTil File To Store Commonly used methods
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 */
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public class StoreUtil {
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    /**
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     * Check if the User is logged in with the requested role
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     */
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    public static boolean isLoggedIn(UserRole role, HttpSession session) {
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        return session.getAttribute(role.toString()) != null;
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    }
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    /**
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     * Modify the active tab in the page menu bar
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     */
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    public static void setActiveTab(PrintWriter pw, String activeTab) {
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        pw.println("<script>document.getElementById(activeTab).classList.remove(\"active\");activeTab=" + activeTab
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                + "</script>");
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        pw.println("<script>document.getElementById('" + activeTab + "').classList.add(\"active\");</script>");
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    }
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    /**
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     * Add/Remove/Update Item in the cart using the session
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     */
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    public static void updateCartItems(HttpServletRequest req) {
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        String selectedBookId = req.getParameter("selectedBookId");
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        HttpSession session = req.getSession();
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        if (selectedBookId != null) { // add item to the cart
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            // Items will contain comma separated bookIds that needs to be added in the cart
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            String items = (String) session.getAttribute("items");
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            if (req.getParameter("addToCart") != null) { // add to cart
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                if (items == null || items.length() == 0)
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                    items = selectedBookId;
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                else if (!items.contains(selectedBookId))
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                    items = items + "," + selectedBookId; // if items already contains bookId, don't add it
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                // set the items in the session to be used later
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                session.setAttribute("items", items);
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                /*
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                 * Quantity of each item in the cart will be stored in the session as:
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                 * Prefixed with qty_ following its bookId
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                 * For example 2 no. of book with id 'myBook' in the cart will be
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                 * added to the session as qty_myBook=2
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                 */
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                int itemQty = 0;
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                if (session.getAttribute("qty_" + selectedBookId) != null)
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                    itemQty = (int) session.getAttribute("qty_" + selectedBookId);
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                itemQty += 1;
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                session.setAttribute("qty_" + selectedBookId, itemQty);
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            } else { // remove from the cart
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                int itemQty = 0;
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                if (session.getAttribute("qty_" + selectedBookId) != null)
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                    itemQty = (int) session.getAttribute("qty_" + selectedBookId);
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                if (itemQty > 1) {
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                    itemQty--;
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                    session.setAttribute("qty_" + selectedBookId, itemQty);
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                } else {
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                    session.removeAttribute("qty_" + selectedBookId);
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                    items = items.replace(selectedBookId + ",", "");
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                    items = items.replace("," + selectedBookId, "");
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                    items = items.replace(selectedBookId, "");
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                    session.setAttribute("items", items);
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                }
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            }
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        }
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    }
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}
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