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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2016 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.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:
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 * 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
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 */

package com.sun.faces.application;

import java.lang.reflect.Field;
import java.text.MessageFormat;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.faces.application.Application;
import javax.faces.application.ApplicationFactory;
import javax.faces.context.FacesContext;

import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Util;

/**
 * This {@link javax.faces.application.ApplicationFactory} is responsible for injecting the
 * default {@link Application} instance into the top-level {@link Application}
 * as configured by the runtime.  Doing this allows us to preserve backwards
 * compatibility as the API evolves without having the API rely on implementation
 * specific details.
 */
public class InjectionApplicationFactory extends ApplicationFactory {

    private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();

    private Application defaultApplication;
    private Field defaultApplicationField;
    private volatile Application application;


    // ------------------------------------------------------------ Constructors


    public InjectionApplicationFactory(ApplicationFactory delegate) {
        super(delegate);
        Util.notNull("applicationFactory", delegate);
    }


    // ----------------------------------------- Methods from ApplicationFactory


    @Override
    public Application getApplication() {

        if (application == null) {
            application = getWrapped().getApplication();
            if (application == null) {
                // No i18n here
                String message = MessageFormat
                      .format("Delegate ApplicationContextFactory, {0}, returned null when calling getApplication().",
                              getWrapped().getClass().getName());
                throw new IllegalStateException(message);
            }
            injectDefaultApplication();
        }
        return application;

    }

    
    @Override
    public synchronized void setApplication(Application application) {

        this.application = application;
        getWrapped().setApplication(application);
        injectDefaultApplication();
        
    }


    // --------------------------------------------------------- Private Methods


    private void injectDefaultApplication() {


        if (defaultApplication == null) {
            FacesContext ctx = FacesContext.getCurrentInstance();
            defaultApplication = InjectionApplicationFactory.
                    removeApplicationInstance(ctx.getExternalContext().getApplicationMap());
        }
        if (defaultApplication != null) {
            try {
                if (defaultApplicationField == null) {
                    defaultApplicationField =
                          Application.class
                                .getDeclaredField("defaultApplication");
                    defaultApplicationField.setAccessible(true);
                }
                defaultApplicationField.set(application, defaultApplication);

            } catch (NoSuchFieldException nsfe) {
                if (LOGGER.isLoggable(Level.FINE)) {
                    LOGGER.log(Level.FINE, "Unable to find private field named 'defaultApplication' in javax.faces.application.Application.");
                }
            } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
                if (LOGGER.isLoggable(Level.SEVERE)) {
                    LOGGER.log(Level.SEVERE, e.toString(), e);
                }
            }
        }
    }

    // ------------------------------------------------- Package private Methods

    static void setApplicationInstance(Application app) {
        Map appMap = FacesContext.getCurrentInstance().getExternalContext().getApplicationMap();
        appMap.put(InjectionApplicationFactory.class.getName(), app);
    }

    static Application removeApplicationInstance(Map appMap) {
        return (Application) appMap.remove(InjectionApplicationFactory.class.getName());
    }

}




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