com.ocpsoft.pretty.util.FacesContextBuilder Maven / Gradle / Ivy

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/*
 * Copyright 2010 Lincoln Baxter, III
 * 
 * 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.ocpsoft.pretty.util;

import javax.faces.FactoryFinder;
import javax.faces.context.FacesContext;
import javax.faces.context.FacesContextFactory;
import javax.faces.lifecycle.Lifecycle;
import javax.faces.lifecycle.LifecycleFactory;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

public class FacesContextBuilder
{
    public FacesContext getFacesContext(final ServletRequest request, final ServletResponse response)
    {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        if (facesContext != null)
        {
            return facesContext;
        }

        FacesContextFactory contextFactory = (FacesContextFactory) FactoryFinder
                .getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
        LifecycleFactory lifecycleFactory = (LifecycleFactory) FactoryFinder
                .getFactory(FactoryFinder.LIFECYCLE_FACTORY);
        Lifecycle lifecycle = lifecycleFactory.getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE);

        ServletContext servletContext = ((HttpServletRequest) request).getSession().getServletContext();
        facesContext = contextFactory.getFacesContext(servletContext, request, response, lifecycle);
        InnerFacesContext.setFacesContextAsCurrentInstance(facesContext);

        return facesContext;
    }

    private abstract static class InnerFacesContext extends FacesContext
    {
        protected static void setFacesContextAsCurrentInstance(final FacesContext facesContext)
        {
            FacesContext.setCurrentInstance(facesContext);
        }
    }

}