InvalidState.java
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.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 $Id$
*/
public class InvalidState implements Screen
{
/**
* Build the Screen.
*
* @param pipelineData Turbine information.
* @throws Exception a generic exception.
*/
@Override
public String doBuild(PipelineData pipelineData)
throws Exception
{
RunData data = pipelineData.getRunData();
StringBuilder body = new StringBuilder();
body.append("<body>");
StringBuilder message = new StringBuilder();
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.append(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.append( "<a href=\"" ).append(back.getRelativeLink()).append("\">here</a>");
message.append(" to return the the screen you were working on.");
body.append(message);
body.append("</body>");
return body.toString();
}
}