updatecartaction.java

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/*
 * @author                        : Neelesh
 * @Version                       : 1.0
 *
 * Development Environment        : Oracle9i JDeveloper
 * Name of the File               : UpdateCartAction.java
 * Creation/Modification History  :
 *
 * Neelesh   14-Jan-2003      Created
 *
 */
package oracle.otnsamples.vsm.actions.mall;


// Servlet and IO API
import java.io.IOException;

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

import oracle.otnsamples.util.MessageCache;
import oracle.otnsamples.util.ServiceLocator;
import oracle.otnsamples.vsm.services.ServiceException;
import oracle.otnsamples.vsm.services.ShoppingCart;
import oracle.otnsamples.vsm.services.ShoppingCartHome;

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


/**
 * The action class updates the cart with new quantities entered and redirects
 * to the originating page
 *
 * @author Neelesh
 * @version 1.0
 */
public class UpdateCartAction extends Action {
  /**
   * This is the action called from the Struts framework to 
   * add an item to user cart.
   *
   * @param <b>mapping</b> The ActionMapping used to select this instance.
   * @param <b>form</b> The optional ActionForm bean for this request.
   * @param <b>request</b> The HTTP Request we are processing.
   * @param <b>response</b> The HTTP Response we are processing.
   *
   * @return <b>ActionForward</b> The  control forward information
   *
   * @throws <b>IOException</b>
   * @throws <b>ServletException</b>
   */
  public ActionForward execute(
                               ActionMapping mapping, ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response)
                               throws IOException, ServletException {

    ShoppingCartHome cartHome =
      (ShoppingCartHome) ServiceLocator.getLocator().getService("ShoppingCart");
    ShoppingCart cart = null;

    try {

      if(request.getSession().getAttribute("_cart") != null) {
        cart = (ShoppingCart) request.getSession().getAttribute("_cart");

        String key = null;

        // get item ids in the cart
        String[] items = request.getParameterValues("items");

        if(items != null) {

          // get new quantities
          int len   = items.length;
          int[] qty = new int[ len ];

          for(int i = 0; i < len; i++) {
            qty [ i ] =
              Integer.parseInt(request.getParameter("quantity" + items [ i ]));
          }

          cart.updateCart(items, qty);
        }
      }
    } catch(ServiceException ex) {
      // handle errors
      servlet.log("UpdateCartError", ex);
      ActionErrors errors = new ActionErrors();
      errors.add(
                 "CartError",
                 new ActionError(
                                 "error.updatecart",
                                 MessageCache.getMessage(
                                                         ex.getMessageCode(),
                                                         getLocale(request))));
      saveErrors(request, errors);
    } catch(Exception ex) {
      // handle errors
      servlet.log("UpdateCartError", ex);
      ActionErrors errors = new ActionErrors();
      errors.add("CartError", new ActionError("error.updatecart"));
      saveErrors(request, errors);
    }
    request.setAttribute("query", request.getParameter("query"));

    return mapping.findForward("success");
  }
}