/*
    * $Id: EditSubscriptionAction.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.HttpSession;
  import javax.servlet.http.HttpServletResponse;
  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;
  
  
  /**
   * Implementation of <strong>Action</strong> that populates an instance of
   * <code>SubscriptionForm</code> from the currently specified subscription.
   *
   * @author Craig R. McClanahan
   * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
   */
  
  public final class EditSubscriptionAction 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 we will need
      HttpSession session = request.getSession();
      String action = request.getParameter("action");
      if (action == null) {
          action = "Create";
          }
      String host = request.getParameter("host");
          if (log.isDebugEnabled()) {
              log.debug("EditSubscriptionAction:  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"));
     }
 
     // Identify the relevant subscription
     Subscription subscription =
             user.findSubscription(request.getParameter("host"));
     if ((subscription == null) && !action.equals("Create")) {
             if (log.isTraceEnabled()) {
                 log.trace(" No subscription for user " +
                           user.getUsername() + " and host " + host);
             }
         return (mapping.findForward("failure"));
     }
         if (subscription != null) {
             session.setAttribute(Constants.SUBSCRIPTION_KEY, subscription);
         }
 
     // Populate the subscription form
     if (form == null) {
             if (log.isTraceEnabled()) {
                 log.trace(" Creating new SubscriptionForm bean under key "
                           + mapping.getAttribute());
             }
         form = new SubscriptionForm();
             if ("request".equals(mapping.getScope())) {
                 request.setAttribute(mapping.getAttribute(), form);
             } else {
                 session.setAttribute(mapping.getAttribute(), form);
             }
     }
     SubscriptionForm subform = (SubscriptionForm) form;
     subform.setAction(action);
         if (!action.equals("Create")) {
             if (log.isTraceEnabled()) {
                 log.trace(" Populating form from " + subscription);
             }
             try {
                 PropertyUtils.copyProperties(subform, subscription);
                 subform.setAction(action);
             } catch (InvocationTargetException e) {
                 Throwable t = e.getTargetException();
                 if (t == null)
                     t = e;
                 log.error("SubscriptionForm.populate", t);
                 throw new ServletException("SubscriptionForm.populate", t);
             } catch (Throwable t) {
                 log.error("SubscriptionForm.populate", t);
                 throw new ServletException("SubscriptionForm.populate", t);
             }
         }
 
     // Forward control to the edit subscription page
         if (log.isTraceEnabled()) {
             log.trace(" Forwarding to 'success' page");
         }
     return (mapping.findForward("success"));
 
     }
 
 
 }