/**
* Copyright 2005-2013 hdiv.org
*
* Licensed 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.
*/
package org.hdiv.exceptionHandler;
import java.util.Iterator;
import javax.faces.FacesException;
import javax.faces.application.NavigationHandler;
import javax.faces.context.ExceptionHandler;
import javax.faces.context.ExceptionHandlerWrapper;
import javax.faces.context.FacesContext;
import javax.faces.event.ExceptionQueuedEvent;
import javax.faces.event.ExceptionQueuedEventContext;
import javax.servlet.ServletContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hdiv.config.HDIVConfig;
import org.hdiv.exception.StateValidationException;
import org.hdiv.util.HDIVUtil;
/**
* <p>
* ExceptionHandler that processes HDIV exceptions
* </p>
* <p>
* Only for JSF 2.0+
* </p>
*
* @author Gotzon Illarramendi
*/
public class HDIVExceptionHandler extends ExceptionHandlerWrapper {
private static Log log = LogFactory.getLog(HDIVExceptionHandler.class);
/**
* Original ExceptionHandler
*/
private ExceptionHandler original;
/**
* Constructor
*
* @param original
* original ExceptionHandler
*/
public HDIVExceptionHandler(ExceptionHandler original) {
this.original = original;
}
/*
* (non-Javadoc)
*
* @see javax.faces.context.ExceptionHandlerWrapper#getWrapped()
*/
public ExceptionHandler getWrapped() {
return this.original;
}
/*
* (non-Javadoc)
*
* @see javax.faces.context.ExceptionHandlerWrapper#handle()
*/
public void handle() throws FacesException {
for (Iterator<ExceptionQueuedEvent> i = super.getUnhandledExceptionQueuedEvents().iterator(); i.hasNext();) {
ExceptionQueuedEvent event = i.next();
ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) event.getSource();
Throwable t = context.getException();
Throwable cause = this.getRootCause(t);
if (cause instanceof StateValidationException) {
StateValidationException hdivExc = (StateValidationException) cause;
if (log.isDebugEnabled()) {
log.debug("HDIV StateValidationException captured: " + hdivExc);
}
try {
FacesContext fc = FacesContext.getCurrentInstance();
NavigationHandler nav = fc.getApplication().getNavigationHandler();
nav.handleNavigation(fc, null, this.getErrorPage(fc));
fc.renderResponse();
} finally {
i.remove();
}
}
}
getWrapped().handle();
}
/**
* Obtains error page from HDIV configuration.
*
* @param facesContext
* active FacesContext
* @return error page
*/
private String getErrorPage(FacesContext facesContext) {
ServletContext servletContext = (ServletContext) facesContext.getExternalContext().getContext();
HDIVConfig config = HDIVUtil.getHDIVConfig(servletContext);
String errorPage = config.getErrorPage();
return errorPage;
}
}