/*

  * 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.flow.cdi;

 import java.util.ArrayList;

 import java.util.Iterator;

 import java.util.List;

 import javax.enterprise.context.ApplicationScoped;

 import javax.enterprise.inject.Produces;

 import javax.enterprise.inject.spi.BeanManager;

 import javax.enterprise.inject.spi.Producer;

 import javax.faces.context.FacesContext;

 import javax.faces.flow.Flow;

 import javax.faces.flow.builder.FlowBuilder;

 import javax.faces.flow.builder.FlowBuilderParameter;

 import javax.inject.Inject;

 import javax.inject.Named;

 import org.apache.myfaces.cdi.util.CDIUtils;

 import org.apache.myfaces.flow.builder.FlowBuilderImpl;

 /**

  * This bean is used later by CDI to process flow definitions

  *

  * @author Leonardo Uribe

  */

 @Named(FlowBuilderFactoryBean.FLOW_BUILDER_FACTORY_BEAN_NAME)

 @ApplicationScoped

 public class FlowBuilderFactoryBean

 {

     public static final String FLOW_BUILDER_FACTORY_BEAN_NAME =

         "oam_FLOW_BUILDER_FACTORY_BEAN_NAME";

     private List<Flow> flowDefinitions = null;

     @Inject

     private FlowBuilderCDIExtension flowBuilderExtension;

     public FlowBuilderFactoryBean()

     {

     }

     @Produces

     @FlowBuilderParameter

     public FlowBuilder createFlowBuilderInstance()

     {

         return new FlowBuilderImpl();

     }

     /**

      * @return the flowDefinitions

      */

     public synchronized List<Flow> getFlowDefinitions()

     {

         if (flowDefinitions == null)

         {

             flowDefinitions = new ArrayList<Flow>();

             BeanManager beanManager = CDIUtils.getBeanManager(FacesContext.getCurrentInstance().getExternalContext());

             Iterator<Producer<Flow>> it = flowBuilderExtension.getFlowProducers().iterator();

             if (it != null)

             {

                 while (it.hasNext())

                 {

                     Flow flow = it.next().produce(beanManager.<Flow>createCreationalContext(null));

                     flowDefinitions.add(flow);

                 }

             }

         }

         return flowDefinitions;

     }

 }