001 package org.apache.turbine.modules.screens.error;
002
003
004 /*
005 * Licensed to the Apache Software Foundation (ASF) under one
006 * or more contributor license agreements. See the NOTICE file
007 * distributed with this work for additional information
008 * regarding copyright ownership. The ASF licenses this file
009 * to you under the Apache License, Version 2.0 (the
010 * "License"); you may not use this file except in compliance
011 * with the License. You may obtain a copy of the License at
012 *
013 * http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing,
016 * software distributed under the License is distributed on an
017 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
018 * KIND, either express or implied. See the License for the
019 * specific language governing permissions and limitations
020 * under the License.
021 */
022
023
024 import org.apache.ecs.ConcreteElement;
025 import org.apache.ecs.ElementContainer;
026
027 import org.apache.ecs.html.A;
028 import org.apache.fulcrum.parser.ParameterParser;
029
030 import org.apache.turbine.modules.Screen;
031 import org.apache.turbine.pipeline.PipelineData;
032 import org.apache.turbine.util.RunData;
033 import org.apache.turbine.util.uri.TurbineURI;
034
035 /**
036 * Users will get this screen if the screen on their browser is in an
037 * invalid state. For example, if they hit "Back" or "Reload" and
038 * then try to submit old form data.
039 *
040 * If you want one of your screens to check for invalid state
041 * then add a hidden form field called "_session_access_counter"
042 * with the value currently stored in the session. The
043 * SessionValidator action will check to see if it is an old
044 * value and redirect you to this screen.
045 *
046 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
047 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
048 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
049 * @version $Id: InvalidState.java 717934 2008-11-15 21:48:47Z tv $
050 */
051 public class InvalidState
052 extends Screen
053 {
054 /**
055 * Build the Screen.
056 *
057 * @param data Turbine information.
058 * @exception Exception, a generic exception.
059 */
060 public ConcreteElement doBuild(RunData data)
061 throws Exception
062 {
063 ElementContainer body = new ElementContainer();
064 ElementContainer message = new ElementContainer();
065
066 StringBuffer sb = new StringBuffer();
067 sb.append("<b>There has been an error.</b>")
068 .append("<p>")
069 .append("- If you used the browser \"Back\" or \"Reload\"")
070 .append(" buttons please use the navigation buttons we provide")
071 .append(" within the screen.")
072 .append("<p>")
073 .append("Please click ");
074
075 message.addElement(sb.toString());
076 ParameterParser pp;
077 pp = (ParameterParser) data.getUser().getTemp("prev_parameters");
078 pp.remove("_session_access_counter");
079
080 TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen"));
081 back.addPathInfo(pp);
082 message.addElement(new A().setHref(back.getRelativeLink()).addElement("here"));
083
084 message.addElement(" to return the the screen you were working on.");
085
086 body.addElement(message);
087 return body;
088 }
089
090 /**
091 * Build the Screen.
092 *
093 * @param pipelineData Turbine information.
094 * @exception Exception, a generic exception.
095 */
096 public ConcreteElement doBuild(PipelineData pipelineData)
097 throws Exception
098 {
099 RunData data = getRunData(pipelineData);
100 return doBuild(data);
101 }
102
103 }