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org.apache.turbine.modules.screens.error.InvalidState |
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1 | package org.apache.turbine.modules.screens.error; |
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2 | ||
3 | /* |
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4 | * Copyright 2001-2005 The Apache Software Foundation. |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License") |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | ||
19 | import org.apache.ecs.ConcreteElement; |
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20 | import org.apache.ecs.ElementContainer; |
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21 | ||
22 | import org.apache.ecs.html.A; |
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23 | ||
24 | import org.apache.turbine.modules.Screen; |
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25 | import org.apache.turbine.util.RunData; |
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26 | import org.apache.turbine.util.parser.ParameterParser; |
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27 | import org.apache.turbine.util.uri.TurbineURI; |
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28 | ||
29 | /** |
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30 | * Users will get this screen if the screen on their browser is in an |
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31 | * invalid state. For example, if they hit "Back" or "Reload" and |
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32 | * then try to submit old form data. |
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33 | * |
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34 | * If you want one of your screens to check for invalid state |
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35 | * then add a hidden form field called "_session_access_counter" |
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36 | * with the value currently stored in the session. The |
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37 | * SessionValidator action will check to see if it is an old |
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38 | * value and redirect you to this screen. |
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39 | * |
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40 | * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a> |
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41 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
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42 | * @version $Id: InvalidState.java 264148 2005-08-29 14:21:04Z henning $ |
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43 | */ |
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44 | 0 | public class InvalidState |
45 | extends Screen |
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46 | { |
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47 | /** |
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48 | * Build the Screen. |
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49 | * |
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50 | * @param data Turbine information. |
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51 | * @exception Exception, a generic exception. |
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52 | */ |
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53 | public ConcreteElement doBuild(RunData data) |
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54 | throws Exception |
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55 | { |
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56 | 0 | ElementContainer body = new ElementContainer(); |
57 | 0 | ElementContainer message = new ElementContainer(); |
58 | ||
59 | 0 | StringBuffer sb = new StringBuffer(); |
60 | 0 | sb.append("<b>There has been an error.</b>") |
61 | .append("<p>") |
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62 | .append("- If you used the browser \"Back\" or \"Reload\"") |
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63 | .append(" buttons please use the navigation buttons we provide") |
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64 | .append(" within the screen.") |
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65 | .append("<p>") |
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66 | .append("Please click "); |
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67 | ||
68 | 0 | message.addElement(sb.toString()); |
69 | ParameterParser pp; |
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70 | 0 | pp = (ParameterParser) data.getUser().getTemp("prev_parameters"); |
71 | 0 | pp.remove("_session_access_counter"); |
72 | ||
73 | 0 | TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen")); |
74 | 0 | back.addPathInfo(pp); |
75 | 0 | message.addElement(new A().setHref(back.getRelativeLink()).addElement("here")); |
76 | ||
77 | 0 | message.addElement(" to return the the screen you were working on."); |
78 | ||
79 | 0 | body.addElement(message); |
80 | 0 | return body; |
81 | } |
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82 | } |
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