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SaveSubscriptionAction.javaAPI DocExample6772Thu Jul 08 09:27:28 BST 2004org.apache.struts.webapp.example

SaveSubscriptionAction

public final class SaveSubscriptionAction extends org.apache.struts.action.Action
Implementation of Action that validates and creates or updates the mail subscription entered by the user.
version
$Revision: 1.19 $ $Date: 2004/03/14 06:23:44 $

Fields Summary
private Log
log
The Log instance for this application.
Constructors Summary
Methods Summary
public org.apache.struts.action.ActionForwardexecute(org.apache.struts.action.ActionMapping mapping, org.apache.struts.action.ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)


    // --------------------------------------------------------- Public Methods

        // See superclass for Javadoc
      
         
         
         
         
          

        // Extract attributes and parameters we will need
        MessageResources messages = getResources(request);
        HttpSession session = request.getSession();
        SubscriptionForm subform = (SubscriptionForm) form;
        String action = subform.getAction();
        if (action == null) {
            action = "?";
        }
        if (log.isDebugEnabled()) {
            log.debug("SaveSubscriptionAction:  Processing " + action + " action");
        }

        // Is there a currently logged on user?
        User user = (User) session.getAttribute(Constants.USER_KEY);
        if (user == null) {
            if (log.isTraceEnabled()) {
                log.trace(" User is not logged on in session " + session.getId());
            }
            return (mapping.findForward("logon"));
        }

        // Was this transaction cancelled?
        if (isCancelled(request)) {
            if (log.isTraceEnabled()) {
                log.trace(" Transaction '" + action + "' was cancelled");
            }
            session.removeAttribute(Constants.SUBSCRIPTION_KEY);
            return (mapping.findForward("success"));
        }

        // Is there a related Subscription object?
        Subscription subscription =
            (Subscription) session.getAttribute(Constants.SUBSCRIPTION_KEY);
        if ("Create".equals(action)) {
            subscription = user.createSubscription(request.getParameter("host"));
        }
        if (subscription == null) {
            if (log.isTraceEnabled()) {
                log.trace(
                    " Missing subscription for user '" + user.getUsername() + "'");
            }
            response.sendError(
                HttpServletResponse.SC_BAD_REQUEST,
                messages.getMessage("error.noSubscription"));
            return (null);
        }

        // Was this transaction a Delete?
        if (action.equals("Delete")) {
            if (log.isTraceEnabled()) {
                log.trace(
                    " Deleting mail server '"
                        + subscription.getHost()
                        + "' for user '"
                        + user.getUsername()
                        + "'");
            }
            user.removeSubscription(subscription);
            session.removeAttribute(Constants.SUBSCRIPTION_KEY);
            try {
                UserDatabase database =
                    (UserDatabase) servlet.getServletContext().getAttribute(
                        Constants.DATABASE_KEY);
                database.save();
            } catch (Exception e) {
                log.error("Database save", e);
            }
            return (mapping.findForward("success"));
        }

        // All required validations were done by the form itself

        // Update the persistent subscription information
        if (log.isTraceEnabled()) {
            log.trace(" Populating database from form bean");
        }
        try {
            PropertyUtils.copyProperties(subscription, subform);
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t == null)
                t = e;
            log.error("Subscription.populate", t);
            throw new ServletException("Subscription.populate", t);
        } catch (Throwable t) {
            log.error("Subscription.populate", t);
            throw new ServletException("Subscription.populate", t);
        }

        try {
            UserDatabase database =
                (UserDatabase) servlet.getServletContext().getAttribute(
                    Constants.DATABASE_KEY);
            database.save();
        } catch (Exception e) {
            log.error("Database save", e);
        }

        // Remove the obsolete form bean and current subscription
        if (mapping.getAttribute() != null) {
            if ("request".equals(mapping.getScope()))
                request.removeAttribute(mapping.getAttribute());
            else
                session.removeAttribute(mapping.getAttribute());
        }
        session.removeAttribute(Constants.SUBSCRIPTION_KEY);

        // Forward control to the specified success URI
        if (log.isTraceEnabled()) {
            log.trace(" Forwarding to success page");
        }
        return (mapping.findForward("success"));