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.fulcrum.parser.ParameterParser; 25 import org.apache.turbine.modules.Screen; 26 import org.apache.turbine.pipeline.PipelineData; 27 import org.apache.turbine.util.RunData; 28 import org.apache.turbine.util.uri.TurbineURI; 29 30 /** 31 * Users will get this screen if the screen on their browser is in an 32 * invalid state. For example, if they hit "Back" or "Reload" and 33 * then try to submit old form data. 34 * 35 * If you want one of your screens to check for invalid state 36 * then add a hidden form field called "_session_access_counter" 37 * with the value currently stored in the session. The 38 * SessionValidator action will check to see if it is an old 39 * value and redirect you to this screen. 40 * 41 * @author <a href="mailto:mbryson@mont.mindspring.com">Dave Bryson</a> 42 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> 43 * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a> 44 * @version $Id: InvalidState.java 1854797 2019-03-04 20:41:39Z tv $ 45 */ 46 public class InvalidState implements Screen 47 { 48 /** 49 * Build the Screen. 50 * 51 * @param pipelineData Turbine information. 52 * @throws Exception a generic exception. 53 */ 54 @Override 55 public String doBuild(PipelineData pipelineData) 56 throws Exception 57 { 58 RunData data = pipelineData.getRunData(); 59 StringBuilder body = new StringBuilder(); 60 body.append("<body>"); 61 62 StringBuilder message = new StringBuilder(); 63 StringBuilder sb = new StringBuilder(); 64 sb.append("<b>There has been an error.</b>") 65 .append("<p>") 66 .append("- If you used the browser \"Back\" or \"Reload\"") 67 .append(" buttons please use the navigation buttons we provide") 68 .append(" within the screen.") 69 .append("<p>") 70 .append("Please click "); 71 72 message.append(sb.toString()); 73 ParameterParser pp; 74 pp = (ParameterParser) data.getUser().getTemp("prev_parameters"); 75 pp.remove("_session_access_counter"); 76 77 TurbineURIuri/TurbineURI.html#TurbineURI">TurbineURI back = new TurbineURI(data,(String) data.getUser().getTemp("prev_screen")); 78 back.addPathInfo(pp); 79 message.append( "<a href=\"" ).append(back.getRelativeLink()).append("\">here</a>"); 80 message.append(" to return the the screen you were working on."); 81 82 body.append(message); 83 body.append("</body>"); 84 return body.toString(); 85 } 86 }