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    1   package org.apache.turbine.modules.screens.error;
    2
    3
    4   /*
    5    * Licensed to the Apache Software Foundation (ASF) under one
    6    * or more contributor license agreements.  See the NOTICE file
    7    * distributed with this work for additional information
    8    * regarding copyright ownership.  The ASF licenses this file
    9    * to you under the Apache License, Version 2.0 (the
    10   * "License"); you may not use this file except in compliance
    11   * with the License.  You may obtain a copy of the License at
    12   *
    13   *   http://www.apache.org/licenses/LICENSE-2.0
    14   *
    15   * Unless required by applicable law or agreed to in writing,
    16   * software distributed under the License is distributed on an
    17   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    18   * KIND, either express or implied.  See the License for the
    19   * specific language governing permissions and limitations
    20   * under the License.
    21   */
    22
    23
    24  import org.apache.ecs.ElementContainer;
    25  import org.apache.ecs.html.A;
    26  import org.apache.fulcrum.parser.ParameterParser;
    27  import org.apache.turbine.modules.Screen;
    28  import org.apache.turbine.pipeline.PipelineData;
    29  import org.apache.turbine.util.RunData;
    30  import org.apache.turbine.util.uri.TurbineURI;
    31
    32  /**
    33   * Users will get this screen if the screen on their browser is in an
    34   * invalid state.  For example, if they hit "Back" or "Reload" and
    35   * then try to submit old form data.
    36   *
    37   * If you want one of your screens to check for invalid state
    38   * then add a hidden form field called "_session_access_counter"
    39   * with the value currently stored in the session.  The
    40   * SessionValidator action will check to see if it is an old
    41   * value and redirect you to this screen.
    42   *
    43   * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
    44   * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    45   * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
    46   * @version $Id: InvalidState.java 1709648 2015-10-20 17:08:10Z tv $
    47   */
    48  public class InvalidState
    49      extends Screen
    50  {
    51      /**
    52       * Build the Screen.
    53       *
    54       * @param pipelineData Turbine information.
    55       * @exception Exception, a generic exception.
    56       */
    57      @Override
    58      public String doBuild(PipelineData pipelineData)
    59              throws Exception
    60      {
    61          RunData data = getRunData(pipelineData);
    62          ElementContainer body = new ElementContainer();
    63          ElementContainer message = new ElementContainer();
    64
    65          StringBuilder sb = new StringBuilder();
    66          sb.append("<b>There has been an error.</b>")
    67                  .append("<p>")
    68                  .append("- If you used the browser \"Back\" or \"Reload\"")
    69                  .append(" buttons please use the navigation buttons we provide")
    70                  .append(" within the screen.")
    71                  .append("<p>")
    72                  .append("Please click ");
    73
    74          message.addElement(sb.toString());
    75          ParameterParser pp;
    76          pp = (ParameterParser) data.getUser().getTemp("prev_parameters");
    77          pp.remove("_session_access_counter");
    78
    79          TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen"));
    80          back.addPathInfo(pp);
    81          message.addElement(new A().setHref(back.getRelativeLink()).addElement("here"));
    82
    83          message.addElement(" to return the the screen you were working on.");
    84
    85          body.addElement(message);
    86          return body.toString();
    87      }
    88  }