com.commerce4j.storefront.controllers.CartController.java Source code

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Here is the source code for com.commerce4j.storefront.controllers.CartController.java

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/**
 * Copyright 2010 Commerce4J.
 * 
 * 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.commerce4j.storefront.controllers;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

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

import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.ModelAndView;

import com.commerce4j.model.dto.CartDTO;
import com.commerce4j.model.dto.ItemDTO;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

/**
 * @author carlos.quijano
 * @version $Revision$ $Date$
 */
public class CartController extends BaseController {

    /* (non-Javadoc)
     * @see com.commerce4j.storefront.controllers.BaseController#unspecified(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public ModelAndView unspecified(HttpServletRequest request, HttpServletResponse response) {
        return cart(request, response);
    }

    /**
     * @param request
     * @param response
     * @return
     */
    public ModelAndView cart(HttpServletRequest request, HttpServletResponse response) {

        ModelAndView mav = new ModelAndView("cart");

        return mav;
    }

    /**
     * @param request
     * @param response
     */
    public void add(HttpServletRequest request, HttpServletResponse response) {

        Gson gson = new GsonBuilder().create();
        List<Message> errors = new ArrayList<Message>();
        Map<String, Object> responseModel = new HashMap<String, Object>();

        String item = request.getParameter("item");
        String quantity = request.getParameter("quantity");

        if (StringUtils.isEmpty(item)) {
            errors.add(newError("item", getString("errors.notEmpty"), new Object[] { "item" }));
        }

        // find item
        ItemDTO itemDTO = getItemDSO().findById(new Integer(item));
        if (item == null)
            errors.add(newError("item", getString("errors.notEmpty"), new Object[] { "item" }));

        // check cart in session
        List<CartDTO> cartEntries = getCart(request);

        // create cart entry
        String cartId = request.getSession().getId();
        Integer iQuantity = new Integer(quantity);
        Double subtotal = itemDTO.getItemPrice() * iQuantity;
        CartDTO cartDTO = new CartDTO(cartId, itemDTO, iQuantity, subtotal);
        cartEntries.add(cartDTO);

        // persist session
        request.getSession().setAttribute("cart", cartEntries);

        // fill response model
        if (errors.isEmpty()) {
            responseModel.put("responseCode", SUCCESS);
            responseModel.put("responseMessage", "Item Added to Cart");
        } else {
            responseModel.put("responseCode", FAILURE);
            responseModel.put("responseMessage", "Error, item was not added");
            responseModel.put("errors", errors);
        }

        // serialize output
        try {
            response.setContentType("application/json");
            OutputStreamWriter os = new OutputStreamWriter(response.getOutputStream());
            String data = gson.toJson(responseModel);
            os.write(data);
            os.flush();
            os.close();
        } catch (IOException e) {
            logger.fatal(e);
        }
    }

    @SuppressWarnings("unchecked")
    public void update(HttpServletRequest request, HttpServletResponse response) {

        Gson gson = new GsonBuilder().create();
        List<Message> errors = new ArrayList<Message>();
        Map<String, Object> responseModel = new HashMap<String, Object>();

        List<CartDTO> cartEntries = getCart(request);
        Iterator inputSet = request.getParameterMap().keySet().iterator();
        while (inputSet.hasNext()) {
            String paramName = (String) inputSet.next();
            if (StringUtils.contains(paramName, "qty")) {
                String paramValue = request.getParameter(paramName);
                String paramId = StringUtils.substring(paramName, 4, paramName.length());
                if (paramId != null && StringUtils.isNumeric(paramId)) {
                    for (CartDTO cartEntry : cartEntries) {
                        int entryId = cartEntry.getItem().getItemId().intValue();
                        int itemId = new Integer(paramId).intValue();
                        int cartQuantity = new Integer(paramValue).intValue();
                        if (entryId == itemId) {
                            cartEntry.setCartQuantity(cartQuantity);
                            cartEntry.setCartSubTotal(cartEntry.getItem().getItemPrice() * cartQuantity);
                            break;
                        }
                    }
                }
            }
        }

        // fill response model
        if (errors.isEmpty()) {
            responseModel.put("responseCode", SUCCESS);
            responseModel.put("responseMessage", "Cart succesfully updated");
        } else {
            responseModel.put("responseCode", FAILURE);
            responseModel.put("responseMessage", "Error, Cart was not updated");
            responseModel.put("errors", errors);
        }

        // serialize output
        try {
            response.setContentType("application/json");
            OutputStreamWriter os = new OutputStreamWriter(response.getOutputStream());
            String data = gson.toJson(responseModel);
            os.write(data);
            os.flush();
            os.close();
        } catch (IOException e) {
            logger.fatal(e);
        }

    }

}