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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
There is a newer version: 2.2.20
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright (c) 1997-2013 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:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 * 
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 * 
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package com.sun.faces.application.view;

import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.enterprise.context.ContextNotActiveException;
import javax.enterprise.context.spi.Context;
import javax.enterprise.context.spi.Contextual;
import javax.enterprise.context.spi.CreationalContext;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.view.ViewScoped;

/**
 * The CDI context for CDI ViewScoped beans.
 */
public class ViewScopeContext implements Context, Serializable {

    /**
     * Stores the logger.
     */
    private static final Logger LOGGER = Logger.getLogger(ViewScopeContext.class.getName());
    /**
     * Stores the serial version UID.
     */
    private static final long serialVersionUID = -6245899073989073951L;

    /**
     * Constructor.
     */
    public ViewScopeContext() {
        if (LOGGER.isLoggable(Level.FINEST)) {
            LOGGER.log(Level.FINEST, "Creating ViewScope CDI context");
        }
    }

    /**
     * Assert the context is active, otherwise throw ContextNotActiveException.
     */
    @SuppressWarnings({"FinalPrivateMethod"})
    private final void assertNotReleased() {
        if (!isActive()) {
            if (LOGGER.isLoggable(Level.SEVERE)) {
                LOGGER.log(Level.SEVERE, "Trying to access ViewScope CDI context while it is not active");
            }
            throw new ContextNotActiveException();
        }
    }


    /**
     * Get the ViewScoped bean for the given contextual.
     *
     * @param  the type.
     * @param contextual the contextual.
     * @return the view scoped bean, or null if not found.
     */
    @Override
    public  T get(Contextual contextual) {
        assertNotReleased();

        T result = null;
        
        FacesContext facesContext = FacesContext.getCurrentInstance();
        if (facesContext != null) {
            ViewScopeManager manager = ViewScopeManager.getInstance(facesContext);
            if (manager != null) {
                result = manager.getContextManager().getBean(facesContext, contextual);
            }
        }

        return result;
    }

    /**
     * Get the existing instance of the ViewScoped bean for the given contextual
     * or create a new one.
     *
     * @param  the type.
     * @param contextual the contextual.
     * @param creational the creational.
     * @return the instance.
     * @throws ContextNotActiveException when the context is not active.
     */
    @Override
    public  T get(Contextual contextual, CreationalContext creational) {
        assertNotReleased();

        T result = get(contextual);

        if (result == null) {
            FacesContext facesContext = FacesContext.getCurrentInstance();
            if (facesContext != null) {
                ViewScopeManager manager = ViewScopeManager.getInstance(facesContext);
                result = (T) manager.getContextManager().getBean(facesContext, contextual);
                if (result == null) {
                    result = (T) manager.getContextManager().createBean(facesContext, contextual, creational);
                }
            }
        }

        return result;
    }

    /**
     * Get the class of the scope object.
     *
     * @return the class.
     */
    @Override
    public Class getScope() {
        return ViewScoped.class;
    }

    /**
     * Determine if the context is active.
     *
     * @return true if there is a view root, false otherwise.
     */
    @Override
    public boolean isActive() {
        boolean result = false;

        FacesContext facesContext = FacesContext.getCurrentInstance();
        if (facesContext != null) {
            UIViewRoot viewRoot = facesContext.getViewRoot();
            if (viewRoot != null) {
                result = true;
            }
        }

        return result;
    }
}