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 1773378 2016-12-09 13:19:59Z tv $ 47 */ 48 public class InvalidState 49 extends Screen 50 { 51 /** 52 * Build the Screen. 53 * 54 * @param pipelineData Turbine information. 55 * @throws 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 }