package dk.hansen;

import javax.servlet.ServletConfig;
import javax.servlet.http.*;
import javax.sql.DataSource;

import org.apache.struts.action.*;

public abstract class CommonBookAction extends Action {

   public ActionForward execute(
      ActionMapping mapping,
      ActionForm form,
      HttpServletRequest request,
      HttpServletResponse response)
      throws DAOException {

      HttpSession session = request.getSession();

      if (session.getAttribute("bookfactory") == null) {
         // No factory factory created yet
         ServletConfig conf = servlet.getServletConfig();
         String managerName = conf.getInitParameter("myfactory");

         BookManagerFactoryIF factory = null;

         // Select the proper factory
         if (managerName.equals("Struts")) {
            DataSource dataSource = getDataSource(request);
            factory = new StrutsBookManagerFactory(dataSource);
         } else if (managerName.equals("Simple")) {
            factory = new SimpleBookManagerFactory();
         } else if (managerName.equals("Tomcat")) {
            factory = new TomcatBookManagerFactory();
         } else
            throw new DAOException("factory " + managerName + " is not known");

         session.setAttribute("bookfactory", factory);
      }

      return commonExecute(mapping, form, request, response);
   }

   public abstract ActionForward commonExecute(
      ActionMapping mapping,
      ActionForm form,
      HttpServletRequest request,
      HttpServletResponse response);
}