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.ecs.ElementContainer;
25 import org.apache.ecs.html.A;
26 import org.apache.fulcrum.parser.ParameterParser;
27 import org.apache.turbine.modules.Screen;
28 import org.apache.turbine.pipeline.PipelineData;
29 import org.apache.turbine.util.RunData;
30 import org.apache.turbine.util.uri.TurbineURI;
31
32 /**
33 * Users will get this screen if the screen on their browser is in an
34 * invalid state. For example, if they hit "Back" or "Reload" and
35 * then try to submit old form data.
36 *
37 * If you want one of your screens to check for invalid state
38 * then add a hidden form field called "_session_access_counter"
39 * with the value currently stored in the session. The
40 * SessionValidator action will check to see if it is an old
41 * value and redirect you to this screen.
42 *
43 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
44 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
45 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
46 * @version $Id: InvalidState.java 1709648 2015-10-20 17:08:10Z tv $
47 */
48 public class InvalidState
49 extends Screen
50 {
51 /**
52 * Build the Screen.
53 *
54 * @param pipelineData Turbine information.
55 * @exception Exception, a generic exception.
56 */
57 @Override
58 public String doBuild(PipelineData pipelineData)
59 throws Exception
60 {
61 RunData data = getRunData(pipelineData);
62 ElementContainer body = new ElementContainer();
63 ElementContainer message = new ElementContainer();
64
65 StringBuilder sb = new StringBuilder();
66 sb.append("<b>There has been an error.</b>")
67 .append("<p>")
68 .append("- If you used the browser \"Back\" or \"Reload\"")
69 .append(" buttons please use the navigation buttons we provide")
70 .append(" within the screen.")
71 .append("<p>")
72 .append("Please click ");
73
74 message.addElement(sb.toString());
75 ParameterParser pp;
76 pp = (ParameterParser) data.getUser().getTemp("prev_parameters");
77 pp.remove("_session_access_counter");
78
79 TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen"));
80 back.addPathInfo(pp);
81 message.addElement(new A().setHref(back.getRelativeLink()).addElement("here"));
82
83 message.addElement(" to return the the screen you were working on.");
84
85 body.addElement(message);
86 return body.toString();
87 }
88 }