1 /*
2 * $Id: WelcomeAction.java 471754 2006-11-06 14:55:09Z husted $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21 package org.apache.struts.apps.mailreader.actions;
22
23 import org.apache.struts.action.ActionForm;
24 import org.apache.struts.action.ActionForward;
25 import org.apache.struts.action.ActionMapping;
26 import org.apache.struts.apps.mailreader.Constants;
27 import org.apache.struts.apps.mailreader.dao.UserDatabase;
28 import org.apache.struts.util.MessageResources;
29
30 import javax.servlet.http.HttpServletRequest;
31 import javax.servlet.http.HttpServletResponse;
32 import java.util.ArrayList;
33
34
35 /**
36 * <p>
37 * Confirm required resources are available before displaying initial page.
38 * </p><p>
39 * If a resource is missing,
40 * forward to "failure". Otherwise, forward to "success", where
41 * success is usually the "welcome" page.
42 * </p><p>
43 * Since "required resources" includes the application MessageResources
44 * the failure page must not use the standard error or message tags.
45 * Instead, it display the Strings stored in an ArrayList stored under
46 * the request attribute "ERROR".
47 * </p>
48 *
49 * @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
50 */
51 public final class WelcomeAction extends BaseAction {
52
53 // See superclass for Javadoc
54 public ActionForward execute(
55 ActionMapping mapping,
56 ActionForm form,
57 HttpServletRequest request,
58 HttpServletResponse response)
59 throws Exception {
60
61 // Setup message array in case there are errors
62 ArrayList messages = new ArrayList();
63
64 // Confirm message resources loaded
65 MessageResources resources = getResources(request);
66 if (resources == null) {
67 messages.add(Constants.ERROR_MESSAGES_NOT_LOADED);
68 }
69
70 // Confirm database loaded
71 UserDatabase userDatabase = doGetUserDatabase();
72 if (userDatabase == null) {
73 messages.add(Constants.ERROR_DATABASE_NOT_LOADED);
74 }
75
76 // If there were errors, forward to our failure page
77 if (messages.size() > 0) {
78 request.setAttribute(Constants.ERROR_KEY, messages);
79 return doFindFailure(mapping);
80 }
81
82 // Forward to our success page
83 return doFindSuccess(mapping);
84
85 }
86
87 }