/*
* $Id: SaveSubscriptionAction.java 471754 2006-11-06 14:55:09Z husted $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.struts.webapp.example;
import java.lang.reflect.InvocationTargetException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;
/**
* Implementation of <strong>Action</strong> that validates and creates or
* updates the mail subscription entered by the user.
*
* @author Craig R. McClanahan
* @version $Rev: 471754 $ $Date: 2006-11-06 15:55:09 +0100 (Lun, 06 nov 2006) $
*/
public final class SaveSubscriptionAction extends Action {
// ----------------------------------------------------- Instance Variables
/**
* The <code>Log</code> instance for this application.
*/
private Log log =
LogFactory.getLog("org.apache.struts.webapp.Example");
// --------------------------------------------------------- Public Methods
/**
* Process the specified HTTP request, and create the corresponding HTTP
* response (or forward to another web component that will create it).
* Return an <code>ActionForward</code> instance describing where and how
* control should be forwarded, or <code>null</code> if the response has
* already been completed.
*
* @param mapping The ActionMapping used to select this instance
* @param form The optional ActionForm bean for this request (if any)
* @param request The HTTP request we are processing
* @param response The HTTP response we are creating
*
* @exception Exception if the application business logic throws
* an exception
*/
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
// 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)) {
if (log.isTraceEnabled()) {
log.trace(" Creating subscription for mail server '" +
subform.getHost() + "'");
}
subscription =
user.createSubscription(subform.getHost());
}
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"));
}
}