1 package org.apache.turbine.modules.screens.error;
2
3
4 /*
5 * Licensed to the Apache Software Foundation (ASF) under one
6 * or more contributor license agreements. See the NOTICE file
7 * distributed with this work for additional information
8 * regarding copyright ownership. The ASF licenses this file
9 * to you under the Apache License, Version 2.0 (the
10 * "License"); you may not use this file except in compliance
11 * with the License. You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing,
16 * software distributed under the License is distributed on an
17 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 * KIND, either express or implied. See the License for the
19 * specific language governing permissions and limitations
20 * under the License.
21 */
22
23
24 import org.apache.fulcrum.parser.ParameterParser;
25 import org.apache.turbine.modules.Screen;
26 import org.apache.turbine.pipeline.PipelineData;
27 import org.apache.turbine.util.RunData;
28 import org.apache.turbine.util.uri.TurbineURI;
29
30 /**
31 * Users will get this screen if the screen on their browser is in an
32 * invalid state. For example, if they hit "Back" or "Reload" and
33 * then try to submit old form data.
34 *
35 * If you want one of your screens to check for invalid state
36 * then add a hidden form field called "_session_access_counter"
37 * with the value currently stored in the session. The
38 * SessionValidator action will check to see if it is an old
39 * value and redirect you to this screen.
40 *
41 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
42 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
43 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
44 * @version $Id$
45 */
46 public class InvalidState implements Screen
47 {
48 /**
49 * Build the Screen.
50 *
51 * @param pipelineData Turbine information.
52 * @throws Exception a generic exception.
53 */
54 @Override
55 public String doBuild(PipelineData pipelineData)
56 throws Exception
57 {
58 RunData data = pipelineData.getRunData();
59 StringBuilder body = new StringBuilder();
60 body.append("<body>");
61
62 StringBuilder message = new StringBuilder();
63 StringBuilder sb = new StringBuilder();
64 sb.append("<b>There has been an error.</b>")
65 .append("<p>")
66 .append("- If you used the browser \"Back\" or \"Reload\"")
67 .append(" buttons please use the navigation buttons we provide")
68 .append(" within the screen.")
69 .append("<p>")
70 .append("Please click ");
71
72 message.append(sb.toString());
73 ParameterParser pp;
74 pp = (ParameterParser) data.getUser().getTemp("prev_parameters");
75 pp.remove("_session_access_counter");
76
77 TurbineURIuri/TurbineURI.html#TurbineURI">TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen"));
78 back.addPathInfo(pp);
79 message.append( "<a href=\"" ).append(back.getRelativeLink()).append("\">here</a>");
80 message.append(" to return the the screen you were working on.");
81
82 body.append(message);
83 body.append("</body>");
84 return body.toString();
85 }
86 }