package dk.hansen;

import javax.servlet.http.*;

import org.apache.log4j.Logger;
import org.apache.struts.action.*;

public final class UpdateBookAction extends CommonBookAction {

   private static Logger logger = 
     Logger.getLogger(UpdateBookAction.class.getName());

   public ActionForward commonExecute(
      ActionMapping mapping,
      ActionForm form,
      HttpServletRequest request,
      HttpServletResponse response) {

      ActionErrors errors = new ActionErrors();

      // Get the data from the Form bean
      DetailBookForm df = (DetailBookForm) form;
      String id = df.getId();
      String title = df.getTitle();
      String author = df.getAuthor();
      int year = df.getYear();

      // Get the factory class
      HttpSession session = request.getSession();
      BookManagerFactoryIF factory = (BookManagerFactoryIF) session.getAttribute("bookfactory");
      BookManagerIF manager = factory.createBookManager();

      try {
         // Update the current Book
         manager.updateBook(id, title, author, year);
      } catch (DAOException e) {
         // Logging the error:
         String message = "Book could not be updated. "
                         + "id=" + id
                         + ", title=" + title
                         + ", author=" + author
                         + ", year=" + year;
         logger.fatal(message, e);
         
         // Message for the user:
         errors.add("label", new ActionError("error.updatefailed"));
         saveErrors(request, errors);
         
         // Save the chained exceptions:
         request.setAttribute("MYEXCEPTION", new DAOException(message, e));
         
         // Return to the error page
         return (mapping.findForward("error"));
      }

      // Forward control to the next page
      return (mapping.findForward("OK"));

   }

}