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Jakarta Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.

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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.faces.flow;

import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Util;
import com.sun.faces.util.cdi11.CDIUtil;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.concurrent.ConcurrentHashMap;

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.enterprise.context.spi.Contextual;
import javax.enterprise.event.Observes;
import javax.enterprise.inject.spi.AfterBeanDiscovery;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.BeforeBeanDiscovery;
import javax.enterprise.inject.spi.Extension;
import javax.enterprise.inject.spi.ProcessBean;
import javax.faces.flow.FlowScoped;

public class FlowCDIExtension implements Extension {


   private Map, FlowCDIContext.FlowBeanInfo> flowScopedBeanFlowIds;
   private boolean isCdiOneOneOrGreater = false;
   private CDIUtil cdiUtil = null;

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

   public FlowCDIExtension() {
       flowScopedBeanFlowIds = new ConcurrentHashMap<>();
       isCdiOneOneOrGreater = Util.isCdiOneOneOrLater(null);
   }
   
   public void processBean(@Observes ProcessBean event) {
       FlowScoped flowScoped = event.getAnnotated().getAnnotation(FlowScoped.class);
       if (null != flowScoped) {
           FlowCDIContext.FlowBeanInfo fbi = new FlowCDIContext.FlowBeanInfo();
           fbi.definingDocumentId = flowScoped.definingDocumentId();
           fbi.id = flowScoped.value();
           flowScopedBeanFlowIds.put(event.getBean(), fbi);
       }
   }
   
   public void beforeBeanDiscovery(@Observes final BeforeBeanDiscovery event, BeanManager beanManager) {
       event.addScope(FlowScoped.class, true, true);
   }

   void afterBeanDiscovery(@Observes final AfterBeanDiscovery event, BeanManager beanManager) {
       event.addContext(new FlowCDIContext(flowScopedBeanFlowIds));
       flowScopedBeanFlowIds.clear();
       
       if (isCdiOneOneOrGreater) {
           Class clazz = null;
           try {
               clazz = Class.forName("com.sun.faces.flow.FlowCDIEventFireHelperImpl");
           } catch (ClassNotFoundException ex) {
               if (LOGGER.isLoggable(Level.SEVERE)) {
                   LOGGER.log(Level.SEVERE, "CDI 1.1 events not enabled", ex);
               }
               return;
           }
           if (null == cdiUtil){
               ServiceLoader oneCdiUtil = ServiceLoader.load(CDIUtil.class);
               for (CDIUtil oneAndOnly : oneCdiUtil) {
                   if (null != cdiUtil) {
                       String message = "Must only have one implementation of CDIUtil available";
                       if (LOGGER.isLoggable(Level.SEVERE)) {
                           LOGGER.log(Level.SEVERE, message);
                       }
                       throw new IllegalStateException(message);
                   }
                   cdiUtil = oneAndOnly;
               }
               
           }
           if (null != cdiUtil) {
               Bean bean = cdiUtil.createHelperBean(beanManager, clazz);
               event.addBean(bean);
           } else if (LOGGER.isLoggable(Level.SEVERE)) {
               LOGGER.log(Level.SEVERE, "Unable to obtain CDI 1.1 utilities for Mojarra");
           }
           
       }
       
   }
   
}