/*
* 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.
*/
package org.apache.myfaces.context;
import java.lang.reflect.Field;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.context.ExceptionHandlerFactory;
import javax.faces.context.ExternalContext;
import javax.faces.context.ExternalContextFactory;
import javax.faces.context.FacesContext;
import javax.faces.context.FacesContextFactory;
import javax.faces.lifecycle.Lifecycle;
import javax.servlet.ServletContext;
import org.apache.myfaces.context.servlet.FacesContextImpl;
import org.apache.myfaces.shared.util.ClassUtils;
/**
* DOCUMENT ME!
*
* @author Manfred Geiler (latest modification by $Author: lu4242 $)
* @version $Revision: 1151650 $ $Date: 2011-07-27 17:14:17 -0500 (Wed, 27 Jul 2011) $
*/
public class FacesContextFactoryImpl extends FacesContextFactory
implements ReleaseableFacesContextFactory
{
//private static final Log log = LogFactory.getLog(FacesContextFactoryImpl.class);
private static final Logger log = Logger.getLogger(FacesContextFactoryImpl.class.getName());
/**
* Reference to factory to prevent unnecessary lookups
*/
private final ExternalContextFactory _externalContextFactory;
/**
* Reference to factory to prevent unnecessary lookups
*/
private final ExceptionHandlerFactory _exceptionHandlerFactory;
/**
* This var is assigned as the same as javax.faces.context.ExternalContext._firstInstance,
* and since it is a static reference and does not change, we can cache it here safely.
*
* We need
*/
private final ThreadLocal<ExternalContext> _firstExternalContextInstance;
@SuppressWarnings("unchecked")
public FacesContextFactoryImpl()
{
super();
ThreadLocal<ExternalContext> firstExternalContextInstance = null;
try
{
Class clazz = ClassUtils.classForName("javax.faces.context._MyFacesExternalContextHelper");
Field externalContextFirstInstance = clazz.getDeclaredField("_firstInstance");
externalContextFirstInstance.setAccessible(true);
if (externalContextFirstInstance != null)
{
if (firstExternalContextInstance == null)
{
firstExternalContextInstance =
(ThreadLocal<ExternalContext>) externalContextFirstInstance.get(null);
}
}
}
catch (SecurityException e)
{
// It could happen, but we can ignore it.
if (log.isLoggable(Level.FINE))
log.log(Level.FINE, "Cannot access field _firstInstance"
+ "from _MyFacesExternalContextHelper ", e);
}
catch (Exception e)
{
if (log.isLoggable(Level.SEVERE))
log.log(Level.SEVERE, "Cannot find field _firstInstance"
+ "from _MyFacesExternalContextHelper ", e);
}
_firstExternalContextInstance = firstExternalContextInstance;
_externalContextFactory = (ExternalContextFactory)
FactoryFinder.getFactory(FactoryFinder.EXTERNAL_CONTEXT_FACTORY);
_exceptionHandlerFactory = (ExceptionHandlerFactory)
FactoryFinder.getFactory(FactoryFinder.EXCEPTION_HANDLER_FACTORY);
}
@Override
public FacesContext getFacesContext(Object context, Object request, Object response, Lifecycle lifecycle)
throws FacesException
{
if (context == null)
{
throw new NullPointerException("context");
}
if (request == null)
{
throw new NullPointerException("request");
}
if (response == null)
{
throw new NullPointerException("response");
}
if (lifecycle == null)
{
throw new NullPointerException("lifecycle");
}
ExternalContext externalContext = _externalContextFactory.getExternalContext(context, request, response);
ExternalContext defaultExternalContext = null;
if (_firstExternalContextInstance != null)
{
defaultExternalContext = (ExternalContext)
externalContext.getRequestMap().remove(
ExternalContextFactoryImpl.EXTERNAL_CONTEXT_KEY);
if (defaultExternalContext != null)
{
// Initialize the firstExternalContext that old jsf 1.2 or lower
// implementations of ExternalContext should fall when call jsf 2.0
// methods.
_firstExternalContextInstance.set(defaultExternalContext);
}
}
//if (context instanceof ServletContext)
//{
FacesContext facesContext;
if (externalContext instanceof ReleaseableExternalContext)
{
facesContext = new FacesContextImpl(externalContext, (ReleaseableExternalContext) externalContext, this);
}
else if (defaultExternalContext != null && defaultExternalContext instanceof ReleaseableExternalContext)
{
facesContext = new FacesContextImpl(externalContext, (ReleaseableExternalContext) defaultExternalContext, this);
}
else
{
facesContext = new FacesContextImpl(externalContext, null, this);
}
facesContext.setExceptionHandler(_exceptionHandlerFactory.getExceptionHandler());
return facesContext;
//return new FacesContextImpl((ServletContext)context, (ServletRequest)request, (ServletResponse)response);
//}
//throw new FacesException("Unsupported context type " + context.getClass().getName());
}
public void release()
{
if (_firstExternalContextInstance != null)
{
_firstExternalContextInstance.remove();
}
}
}