/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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 org.apache.myfaces.spi.impl;

 import org.apache.myfaces.spi.FacesFlowProvider;

 import org.apache.myfaces.spi.FacesFlowProviderFactory;

 import javax.faces.context.ExternalContext;

 import org.apache.myfaces.flow.impl.DefaultFacesFlowProvider;

 import org.apache.myfaces.shared.util.ClassUtils;

 import org.apache.myfaces.util.ExternalSpecifications;

 /**

  * @author Leonardo Uribe

  */

 public class DefaultFacesFlowProviderFactory extends FacesFlowProviderFactory

 {

     public static final String FACES_CONFIGURATION_MERGER = FacesFlowProvider.class.getName();

     public static final String FACES_CONFIGURATION_MERGER_INSTANCE_KEY = FACES_CONFIGURATION_MERGER + ".INSTANCE";

     @Override

     public FacesFlowProvider getFacesFlowProvider(ExternalContext externalContext)

     {

         // check for cached instance

         FacesFlowProvider returnValue = (FacesFlowProvider)

                 externalContext.getApplicationMap().get(FACES_CONFIGURATION_MERGER_INSTANCE_KEY);

         if (returnValue == null)

         {

             if (ExternalSpecifications.isCDIAvailable(externalContext))

             {

                 returnValue = (FacesFlowProvider) ClassUtils.newInstance(

                     "org.apache.myfaces.flow.cdi.DefaultCDIFacesFlowProvider");

             }

             else

             {

                 returnValue = (FacesFlowProvider) new DefaultFacesFlowProvider();

             }

         }

         return returnValue;

     }

 }