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.ConcreteElement;
25 import org.apache.ecs.ElementContainer;
26
27 import org.apache.ecs.html.A;
28 import org.apache.fulcrum.parser.ParameterParser;
29
30 import org.apache.turbine.modules.Screen;
31 import org.apache.turbine.pipeline.PipelineData;
32 import org.apache.turbine.util.RunData;
33 import org.apache.turbine.util.uri.TurbineURI;
34
35 /**
36 * Users will get this screen if the screen on their browser is in an
37 * invalid state. For example, if they hit "Back" or "Reload" and
38 * then try to submit old form data.
39 *
40 * If you want one of your screens to check for invalid state
41 * then add a hidden form field called "_session_access_counter"
42 * with the value currently stored in the session. The
43 * SessionValidator action will check to see if it is an old
44 * value and redirect you to this screen.
45 *
46 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
47 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
48 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
49 * @version $Id: InvalidState.java 717934 2008-11-15 21:48:47Z tv $
50 */
51 public class InvalidState
52 extends Screen
53 {
54 /**
55 * Build the Screen.
56 *
57 * @param data Turbine information.
58 * @exception Exception, a generic exception.
59 */
60 public ConcreteElement doBuild(RunData data)
61 throws Exception
62 {
63 ElementContainer body = new ElementContainer();
64 ElementContainer message = new ElementContainer();
65
66 StringBuffer sb = new StringBuffer();
67 sb.append("<b>There has been an error.</b>")
68 .append("<p>")
69 .append("- If you used the browser \"Back\" or \"Reload\"")
70 .append(" buttons please use the navigation buttons we provide")
71 .append(" within the screen.")
72 .append("<p>")
73 .append("Please click ");
74
75 message.addElement(sb.toString());
76 ParameterParser pp;
77 pp = (ParameterParser) data.getUser().getTemp("prev_parameters");
78 pp.remove("_session_access_counter");
79
80 TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen"));
81 back.addPathInfo(pp);
82 message.addElement(new A().setHref(back.getRelativeLink()).addElement("here"));
83
84 message.addElement(" to return the the screen you were working on.");
85
86 body.addElement(message);
87 return body;
88 }
89
90 /**
91 * Build the Screen.
92 *
93 * @param pipelineData Turbine information.
94 * @exception Exception, a generic exception.
95 */
96 public ConcreteElement doBuild(PipelineData pipelineData)
97 throws Exception
98 {
99 RunData data = getRunData(pipelineData);
100 return doBuild(data);
101 }
102
103 }