001package 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
024import org.apache.ecs.ElementContainer;
025import org.apache.ecs.html.A;
026import org.apache.fulcrum.parser.ParameterParser;
027import org.apache.turbine.modules.Screen;
028import org.apache.turbine.pipeline.PipelineData;
029import org.apache.turbine.util.RunData;
030import org.apache.turbine.util.uri.TurbineURI;
031
032/**
033 * Users will get this screen if the screen on their browser is in an
034 * invalid state.  For example, if they hit "Back" or "Reload" and
035 * then try to submit old form data.
036 *
037 * If you want one of your screens to check for invalid state
038 * then add a hidden form field called "_session_access_counter"
039 * with the value currently stored in the session.  The
040 * SessionValidator action will check to see if it is an old
041 * value and redirect you to this screen.
042 *
043 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a>
044 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
045 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a>
046 * @version $Id: InvalidState.java 1773378 2016-12-09 13:19:59Z tv $
047 */
048public class InvalidState
049    extends Screen
050{
051    /**
052     * Build the Screen.
053     *
054     * @param pipelineData Turbine information.
055     * @throws Exception a generic exception.
056     */
057    @Override
058    public String doBuild(PipelineData pipelineData)
059            throws Exception
060    {
061        RunData data = getRunData(pipelineData);
062        ElementContainer body = new ElementContainer();
063        ElementContainer message = new ElementContainer();
064
065        StringBuilder sb = new StringBuilder();
066        sb.append("<b>There has been an error.</b>")
067                .append("<p>")
068                .append("- If you used the browser \"Back\" or \"Reload\"")
069                .append(" buttons please use the navigation buttons we provide")
070                .append(" within the screen.")
071                .append("<p>")
072                .append("Please click ");
073
074        message.addElement(sb.toString());
075        ParameterParser pp;
076        pp = (ParameterParser) data.getUser().getTemp("prev_parameters");
077        pp.remove("_session_access_counter");
078
079        TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen"));
080        back.addPathInfo(pp);
081        message.addElement(new A().setHref(back.getRelativeLink()).addElement("here"));
082
083        message.addElement(" to return the the screen you were working on.");
084
085        body.addElement(message);
086        return body.toString();
087    }
088}