1 package org.apache.turbine.modules.screens.error;
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19 import org.apache.ecs.ConcreteElement;
20 import org.apache.ecs.ElementContainer;
21
22 import org.apache.ecs.html.A;
23
24 import org.apache.turbine.modules.Screen;
25 import org.apache.turbine.util.RunData;
26 import org.apache.turbine.util.parser.ParameterParser;
27 import org.apache.turbine.util.uri.TurbineURI;
28
29 /***
30 * Users will get this screen if the screen on their browser is in an
31 * invalid state. For example, if they hit "Back" or "Reload" and
32 * then try to submit old form data.
33 *
34 * If you want one of your screens to check for invalid state
35 * then add a hidden form field called "_session_access_counter"
36 * with the value currently stored in the session. The
37 * SessionValidator action will check to see if it is an old
38 * value and redirect you to this screen.
39 *
40 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
41 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
42 * @version $Id: InvalidState.java 264148 2005-08-29 14:21:04Z henning $
43 */
44 public class InvalidState
45 extends Screen
46 {
47 /***
48 * Build the Screen.
49 *
50 * @param data Turbine information.
51 * @exception Exception, a generic exception.
52 */
53 public ConcreteElement doBuild(RunData data)
54 throws Exception
55 {
56 ElementContainer body = new ElementContainer();
57 ElementContainer message = new ElementContainer();
58
59 StringBuffer sb = new StringBuffer();
60 sb.append("<b>There has been an error.</b>")
61 .append("<p>")
62 .append("- If you used the browser \"Back\" or \"Reload\"")
63 .append(" buttons please use the navigation buttons we provide")
64 .append(" within the screen.")
65 .append("<p>")
66 .append("Please click ");
67
68 message.addElement(sb.toString());
69 ParameterParser pp;
70 pp = (ParameterParser) data.getUser().getTemp("prev_parameters");
71 pp.remove("_session_access_counter");
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73 TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen"));
74 back.addPathInfo(pp);
75 message.addElement(new A().setHref(back.getRelativeLink()).addElement("here"));
76
77 message.addElement(" to return the the screen you were working on.");
78
79 body.addElement(message);
80 return body;
81 }
82 }