checkoutaction.java

Java EE 5 许多新功能都包含经过修补的 EJB 架构

/*
 * Copyright 2006 Borys Burnayev
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rdacorp.petstore.web.action;

import java.util.ArrayList;
import java.util.List;

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

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.rdacorp.petstore.domain.OrderItem;

/**
 * @author Borys Burnayev
 */
public class CheckoutAction extends Action {

   public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
            HttpServletResponse response) throws Exception {
      MaintainCartForm maintainCartForm = (MaintainCartForm) form;
      List<OrderItem> cartItems = maintainCartForm.getOrderItems();
      List<String> itemsToRemove = new ArrayList<String>(10);
      for (OrderItem cartItem : cartItems) {
         String itemCode = cartItem.getItem().getCode();
         long itemQuantity = cartItem.getQuantity();

         // check if the requested quantity is in stock
         // and reset it to available quantity if not
         int quantityInStock = cartItem.getItem().getAvailableQuantity();
         if (itemQuantity > 0 && quantityInStock > 0 && itemQuantity > quantityInStock) {
            cartItem.setQuantity(quantityInStock);
         }

         if (itemQuantity == 0)
            itemsToRemove.add(itemCode);
      }
      for (String itemCode : itemsToRemove) {
         maintainCartForm.removeItem(itemCode);
      }
      String action = maintainCartForm.getAction();
      String forward = action != null && action.equals("update") || maintainCartForm.getOrderItems().isEmpty() ? "cart"
               : "success";
      return mapping.findForward(forward);
   }

}