package org.apache.turbine.modules.screens.error;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *   http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 import org.apache.ecs.ElementContainer;

 import org.apache.ecs.html.A;

 import org.apache.fulcrum.parser.ParameterParser;

 import org.apache.turbine.modules.Screen;

 import org.apache.turbine.pipeline.PipelineData;

 import org.apache.turbine.util.RunData;

 import org.apache.turbine.util.uri.TurbineURI;

 /**

  * Users will get this screen if the screen on their browser is in an

  * invalid state.  For example, if they hit "Back" or "Reload" and

  * then try to submit old form data.

  *

  * If you want one of your screens to check for invalid state

  * then add a hidden form field called "_session_access_counter"

  * with the value currently stored in the session.  The

  * SessionValidator action will check to see if it is an old

  * value and redirect you to this screen.

  *

  * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>

  * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>

  * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>

  * @version $Id: InvalidState.java 1773378 2016-12-09 13:19:59Z tv $

  */

 public class InvalidState

     extends Screen

 {

     /**

      * Build the Screen.

      *

      * @param pipelineData Turbine information.

      * @throws Exception a generic exception.

      */

     @Override

     public String doBuild(PipelineData pipelineData)

             throws Exception

     {

         RunData data = getRunData(pipelineData);

         ElementContainer body = new ElementContainer();

         ElementContainer message = new ElementContainer();

         StringBuilder sb = new StringBuilder();

         sb.append("<b>There has been an error.</b>")

                 .append("<p>")

                 .append("- If you used the browser \"Back\" or \"Reload\"")

                 .append(" buttons please use the navigation buttons we provide")

                 .append(" within the screen.")

                 .append("<p>")

                 .append("Please click ");

         message.addElement(sb.toString());

         ParameterParser pp;

         pp = (ParameterParser) data.getUser().getTemp("prev_parameters");

         pp.remove("_session_access_counter");

         TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen"));

         back.addPathInfo(pp);

         message.addElement(new A().setHref(back.getRelativeLink()).addElement("here"));

         message.addElement(" to return the the screen you were working on.");

         body.addElement(message);

         return body.toString();

     }

 }