/*
* JBoss, Home of Professional Open Source
* Copyright 2011, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.jboss.seam.faces.exception;
import java.text.MessageFormat;
import java.util.Iterator;
import javax.enterprise.inject.spi.BeanManager;
import javax.faces.FacesException;
import javax.faces.context.ExceptionHandler;
import javax.faces.context.ExceptionHandlerWrapper;
import javax.faces.event.ExceptionQueuedEvent;
import org.jboss.solder.exception.control.ExceptionToCatch;
import org.jboss.seam.faces.qualifier.FacesLiteral;
import org.jboss.solder.logging.Logger;
import org.jboss.solder.core.Requires;
/**
* This class fires Exceptions from the JSF lifecycle into Seam Catch.
*
* @author <a href="mailto:bleathem@gmail.com">Brian Leathem</a>
* @author <a href="http://community.jboss.org/people/dan.j.allen">Dan Allen</a>
*/
@Requires("org.jboss.solder.exception.control.extension.CatchExtension")
public class CatchExceptionHandler extends ExceptionHandlerWrapper {
private transient final Logger log = Logger.getLogger(CatchExceptionHandler.class);
private ExceptionHandler wrapped;
private BeanManager beanManager;
// default constructor required to make it a bean
public CatchExceptionHandler() {
}
public CatchExceptionHandler(ExceptionHandler wrapped, BeanManager beanManager) {
this.wrapped = wrapped;
this.beanManager = beanManager;
}
@Override
public ExceptionHandler getWrapped() {
return this.wrapped;
}
@Override
public void handle() throws FacesException {
log.trace("Handling Exceptions");
for (Iterator<ExceptionQueuedEvent> it = getUnhandledExceptionQueuedEvents().iterator(); it.hasNext();) {
Throwable t = it.next().getContext().getException();
log.trace(MessageFormat.format("Handling Exception {0}", t.getClass().getName()));
ExceptionToCatch catchEvent = new ExceptionToCatch(t, FacesLiteral.INSTANCE);
try {
if (log.isTraceEnabled()) {
log.trace("Firing event");
}
beanManager.fireEvent(catchEvent);
} catch (Exception e) {
if (!e.equals(t)) {
log.debug("Throwing exception thrown from within Seam Catch");
throw new RuntimeException(e);
}
continue; // exception will be handled by getWrapped().handle() below
}
if (catchEvent.isHandled()) {
log.debug(MessageFormat.format("Exception handled {0}", t.getClass().getName()));
it.remove();
}
}
if (getUnhandledExceptionQueuedEvents().iterator().hasNext()) {
log.debug("Exceptions remain, will be thrown outside of JSF");
getWrapped().handle();
}
}
}