ShowcaseExceptionHandler.java

/*
 * Copyright 2011-2012 Blazebit
 *
 * 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 com.blazebit.blazefaces.showcase.application;

import java.util.Iterator;

import javax.faces.FacesException;
import javax.faces.application.NavigationHandler;
import javax.faces.application.ViewExpiredException;
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;

public class ShowcaseExceptionHandler extends ExceptionHandlerWrapper {

	private ExceptionHandler wrapped;

	public ShowcaseExceptionHandler(ExceptionHandler wrapped) {
		this.wrapped = wrapped;
	}

	@Override
	public ExceptionHandler getWrapped() {
		return this.wrapped;
	}

	@Override
	public void handle() throws FacesException {
		Iterable<ExceptionQueuedEvent> events = this.wrapped
				.getUnhandledExceptionQueuedEvents();
		for (Iterator<ExceptionQueuedEvent> it = events.iterator(); it
				.hasNext();) {
			ExceptionQueuedEvent event = it.next();
			ExceptionQueuedEventContext eqec = event.getContext();

			if (eqec.getException() instanceof ViewExpiredException) {
				FacesContext context = eqec.getContext();
				NavigationHandler navHandler = context.getApplication()
						.getNavigationHandler();

				try {
					navHandler.handleNavigation(context, null,
							"home?faces-redirect=true&expired=true");
				} finally {
					it.remove();
				}
			}
		}

		this.wrapped.handle();
		;
	}
}