jPetStore-master/src/main/java/org/springframework/samples/jpetstore/web/spring/UpdateCartQuantitiesController.java
package org.springframework.samples.jpetstore.web.spring;

import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.samples.jpetstore.domain.Cart;
import org.springframework.samples.jpetstore.domain.CartItem;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.util.WebUtils;

/**
 * @author Juergen Hoeller
 * @since 30.11.2003
 */
public class UpdateCartQuantitiesController implements Controller {

	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
		Cart cart = (Cart) WebUtils.getOrCreateSessionAttribute(request.getSession(), "sessionCart", Cart.class);
		Iterator cartItems = cart.getAllCartItems();
		while (cartItems.hasNext()) {
			CartItem cartItem = (CartItem) cartItems.next();
			String itemId = cartItem.getItem().getItemId();
			try {
				int quantity = Integer.parseInt(request.getParameter(itemId));
				cart.setQuantityByItemId(itemId, quantity);
				if (quantity < 1) {
					cartItems.remove();
				}
			}
			catch (NumberFormatException ex) {
				// ignore on purpose
			}
		}
		request.getSession().setAttribute("sessionCart", cart);
		return new ModelAndView("Cart", "cart", cart);
	}

}
