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Embedded-Web Distribution of the Payara Project for IBM JDK
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2009-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * Modifications:
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 */

package org.glassfish.weld.jsf;

import javax.el.ELContextListener;
import javax.el.ExpressionFactory;
import javax.enterprise.inject.spi.BeanManager;
import javax.faces.application.Application;
import javax.faces.application.ApplicationWrapper;
import javax.faces.context.FacesContext;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletContext;
import javax.servlet.jsp.JspApplicationContext;
import javax.servlet.jsp.JspFactory;


import org.glassfish.weld.util.Util;

import org.apache.jasper.runtime.JspApplicationContextImpl;

public class WeldApplication extends ApplicationWrapper {
   
    private final Application application;
    private ExpressionFactory expressionFactory;
   
    public WeldApplication(Application application) {
        this.application = application;
        BeanManager beanManager = getBeanManager();
        if (beanManager != null) {
            application.addELContextListener(Util.newInstance(
                "org.jboss.weld.el.WeldELContextListener"));
            application.addELResolver(beanManager.getELResolver());
            JspApplicationContext jspAppContext = JspFactory.getDefaultFactory().
                getJspApplicationContext((ServletContext)FacesContext.getCurrentInstance().getExternalContext().getContext());
            this.expressionFactory = beanManager.wrapExpressionFactory(jspAppContext.getExpressionFactory());
            ((JspApplicationContextImpl)jspAppContext).setExpressionFactory(this.expressionFactory);
        }
    }

    public Application getWrapped() {
        return this.application;
    }

    @Override
    public ExpressionFactory getExpressionFactory() {
        if (this.expressionFactory == null) {
            BeanManager beanManager = getBeanManager();
            if (beanManager != null) {
                this.expressionFactory = beanManager.wrapExpressionFactory(getWrapped().getExpressionFactory());
          } else {
              this.expressionFactory = getWrapped().getExpressionFactory(); 
          }
        }
        return expressionFactory;
    }

    private BeanManager getBeanManager() {
        try {
            InitialContext context = new InitialContext();
            return (BeanManager) context.lookup("java:comp/BeanManager");
        } catch (NamingException e) {
            return null;
        }

    }
}