homepageaction.java

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/*
 * @author                        : Neelesh
 * @Version                       : 1.0
 *
 * Development Environment        : Oracle9i JDeveloper
 * Name of the File               : HomePageAction.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.MallNavigation;
import oracle.otnsamples.vsm.services.MallNavigationHome;
import oracle.otnsamples.vsm.services.ServiceException;
import oracle.otnsamples.vsm.services.data.Category;

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 retrieves the category and shop information required for
 * the main page of the application.Extends DisplayCartAction class  to get
 * the cart related information.
 *
 * @author Neelesh
 * @version 1.0
 */
public class HomePageAction extends DisplayCartAction {
  /**
   * This is the action called from the Struts framework to display the main
   * page of the application
   *
   * @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> - Returns 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 {
                               
    super.execute(mapping, form, request, response);

    MallNavigationHome navigationHome =
      (MallNavigationHome) ServiceLocator.getLocator().getService("MallNavigation");
    MallNavigation navigation = null;

    try {
      navigation = navigationHome.create();

      String langID         = getLocale(request).getLanguage();
      Category[] categories = navigation.getAllCategories(langID);
      int len               = categories.length;

      // The data needed for the home page is a list of categories and 
      // a list of shops inside a category. 
      for(int i = 0; i < len; i++) {
        request.setAttribute(
                             "categories" + i,
                             navigation.findShopsInCategory(
                                                       categories [ i ].getId(),
                                                       langID));
      }

      request.setAttribute("categories", categories);
    } catch(ServiceException ex) {
      // handle errors
      servlet.log("HomePageError", ex);      
      ActionErrors errors = new ActionErrors();
      errors.add(
                 "HomePageError",
                 new ActionError(
                                 "error.homepageaction",
                                 MessageCache.getMessage(
                                                         ex.getMessageCode(),
                                                         getLocale(request))));
      saveErrors(request, errors);

    } catch(Exception ex) {
      servlet.log("HomePageError", ex);

      ActionErrors errors = new ActionErrors();
      errors.add("HomePageError", new ActionError("error.homepageaction"));
      saveErrors(request, errors);
    } finally {

      if(navigation != null) {
        try {
          navigation.remove();
        } catch(Exception ex) {
        }
      }
    }
    return mapping.findForward("success");
  }
}