impl/src/main/java/org/apache/myfaces/context/ExternalContextFactoryImpl.java

/*
 * 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 javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.context.ExternalContext;
import javax.faces.context.ExternalContextFactory;
import javax.faces.context.FlashFactory;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.apache.myfaces.context.servlet.ServletExternalContextImpl;
import org.apache.myfaces.util.lang.Assert;

/**
 * @author Leonardo Uribe (latest modification by $Author$)
 * @version $Revision$ $Date$
 * 
 * @since 2.0
 */
public class ExternalContextFactoryImpl extends ExternalContextFactory
{

    public static final String EXTERNAL_CONTEXT_KEY = 
        "org.apache.myfaces.context.servlet.ServletExternalContextImpl";
    
    private final FlashFactory _flashFactory;
    
    public ExternalContextFactoryImpl()
    {
        _flashFactory = (FlashFactory) FactoryFinder.getFactory(
                    FactoryFinder.FLASH_FACTORY);
    }
    
    @Override
    public ExternalContext getExternalContext(Object context, Object request, Object response) throws FacesException
    {
        Assert.notNull(context, "context");
        Assert.notNull(request, "request");
        Assert.notNull(response, "response");

        if (context instanceof ServletContext)
        {
            ExternalContext externalContext = new ServletExternalContextImpl(
                    (ServletContext) context, (ServletRequest) request, (ServletResponse) response,
                    _flashFactory);
            
            externalContext.getRequestMap().put(EXTERNAL_CONTEXT_KEY, externalContext);
            
            return externalContext;
        }
        
        throw new FacesException("Unsupported context type " + context.getClass().getName());
    }
}