1 package org.apache.turbine.modules.screens.error;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Turbine" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache Turbine", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 // ECS
58 import org.apache.ecs.ConcreteElement;
59 import org.apache.ecs.ElementContainer;
60 import org.apache.ecs.html.A;
61
62 // Turbine
63 import org.apache.turbine.modules.Screen;
64 import org.apache.turbine.util.DynamicURI;
65 import org.apache.turbine.util.ParameterParser;
66 import org.apache.turbine.util.RunData;
67
68
69 /***
70 * Users will get this screen if the screen on their browser is in an
71 * invalid state. For example, if they hit "Back" or "Reload" and
72 * then try to submit old form data.
73 *
74 * If you want one of your screens to check for invalid state
75 * then add a hidden form field called "_session_access_counter"
76 * with the value currently stored in the session. The
77 * SessionValidator action will check to see if it is an old
78 * value and redirect you to this screen.
79 *
80 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
81 * @version $Id: InvalidState.java,v 1.1.1.1 2001/08/16 05:08:38 jvanzyl Exp $
82 */
83 public class InvalidState extends Screen
84 {
85 /***
86 * Build the Screen.
87 *
88 * @param data Turbine information.
89 * @exception Exception, a generic exception.
90 */
91 public ConcreteElement doBuild( RunData data )
92 throws Exception
93 {
94 ElementContainer body = new ElementContainer();
95 ElementContainer message = new ElementContainer();
96
97 StringBuffer sb = new StringBuffer();
98 sb.append( "<b>There has been an error.</b>" )
99 .append( "<p>" )
100 .append( "- If you used the browser \"Back\" or \"Reload\"" )
101 .append( " buttons please use the navigation buttons we provide" )
102 .append( " within the screen." )
103 .append( "<p>" )
104 .append( "Please click " );
105
106 message.addElement( sb.toString() );
107 ParameterParser pp;
108 pp = (ParameterParser)data.getUser().getTemp("prev_parameters");
109 pp.remove("_session_access_counter");
110 message.addElement( new A().setHref(
111 new DynamicURI(data,(String)data.getUser().getTemp("prev_screen"))
112 .addPathInfo( pp ).toString()).addElement("here") );
113 message.addElement( " to return the the screen you were working on." );
114
115 body.addElement( message );
116 return body;
117 }
118 }
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