<%@ page import="java.util.*, de.uni_freiburg.informatik.proglang.inetprog2006.*"
errorPage="ShoppingCartError.jsp" %>
Widget Inc.
Widget Inc. Online Shopping
<% Map cart;
if (session.isNew() || session.getAttribute("cart") == null) {
cart = new TreeMap();
session.setAttribute("cart", cart);
} else {
cart = (Map)session.getAttribute("cart");
}
if (request.getMethod().equals("POST")) {
String item = request.getParameter("item");
String amount = request.getParameter("amount");
if (item!=null) {
addToCart(cart, item, Integer.parseInt(amount));
}
}
String url = request.getRequestURI();
%>
<% if (cart.isEmpty()) { %>
Your shopping cart is empty.
<% } else { %>
Your shopping cart now contains:
<%= ShoppingCartHelper.formatItems(cart) %>
">Proceed to cashier
<% }%>
<%! void addToCart(Map cart, String item, int amount) {
if (amount<0)
return;
Integer a = (Integer)cart.get(item);
if (a==null)
a = new Integer(0);
cart.put(item, new Integer(a.intValue()+amount));
}
%>