/*
    * 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;
      }
  }