addtocartaction.java

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/*
 * @author                        : Neelesh
 * @Version                       : 1.0
 *
 * Development Environment        : Oracle9i JDeveloper
 * Name of the File               : AddToCartAction.java
 * Creation/Modification History  :
 *
 * Neelesh   06-Apr-2003      Created
 *
 */
package oracle.otnsamples.vsm.actions.mall;


// IO and servlet 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;


/**
 * This Action class adds an item to the cart. If there is no cart, a new one
 * is created and added to the session.
 *
 * @author Neelesh
 * @version 1.0
 */
 public class AddToCartAction 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 there is no cart in the session, create a new one
      if(request.getSession().getAttribute("_cart") != null) {
        cart = (ShoppingCart) request.getSession().getAttribute("_cart");
      } else {
        cart = cartHome.create();
        // We will store the EJB reference in Http session, since both 
        // web tier and EJB tier are colocated. If they are not, it is a good
        // idea to store the Handle for the EJB in Http session.
        request.getSession().setAttribute("_cart", cart);

        // set the cart's locale to the request locale
        // this remains the same until the user checks out the cart
        cart.setUserLocale(getLocale(request));
      }

      int qty = Integer.parseInt(request.getParameter("qty"));

      if(qty > 0) {
        cart.addToCart(request.getParameter("itemID"), qty);
      }
    } catch(ServiceException ex) {
      // handle errors
      servlet.log("CartError", ex);
      ActionErrors errors = new ActionErrors();
      errors.add(
                 "CartError",
                 new ActionError(
                                 "error.addtocart",
                                 MessageCache.getMessage(
                                                         ex.getMessageCode(),
                                                         getLocale(request))));
      saveErrors(request, errors);
    } catch(Exception ex) {
      // handle errors
      servlet.log("CartError", ex);
      ActionErrors errors = new ActionErrors();
      errors.add("CartError", new ActionError("error.addtocart"));
      saveErrors(request, errors);
    }

    // This is the query string in the originating page, needed to go back to
    //the same page
    request.setAttribute("query", request.getQueryString());

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