/*
    * 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.cdi.view;
  
  
  import javax.enterprise.context.spi.Contextual;
  import javax.enterprise.context.spi.CreationalContext;
  import javax.enterprise.inject.spi.BeanManager;
  import javax.enterprise.inject.spi.PassivationCapable;
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  import javax.enterprise.inject.spi.Bean;
  import javax.faces.context.FacesContext;
  import org.apache.myfaces.cdi.util.CDIUtils;
  import org.apache.myfaces.cdi.util.ContextualInstanceInfo;
  
  /**
   * This Storage holds all information needed for storing
   * View Scope instances in a context.
   * 
   * This scope requires passivation and is not concurrent.
   */
  public class ViewScopeContextualStorage implements Serializable
  {
      private static final long serialVersionUID = 1L;
  
      private final Map<Object, ContextualInstanceInfo<?>> contextualInstances;
      
      private final Map<String, Object> nameBeanKeyMap;
      
      private transient BeanManager beanManager;
      
      private transient volatile boolean deactivated;
  
      /**
       * @param beanManager is needed for serialisation
       * @param concurrent whether the ContextualStorage might get accessed concurrently by different threads
       * @param passivationCapable whether the storage is for passivation capable Scopes
       */
      public ViewScopeContextualStorage(BeanManager beanManager)
      {
          this.beanManager = beanManager;
          contextualInstances = new HashMap<Object, ContextualInstanceInfo<?>>();
          nameBeanKeyMap = new HashMap<String, Object>();
          deactivated = false;
      }
  
      /**
       * @return the underlying storage map.
       */
      public Map<Object, ContextualInstanceInfo<?>> getStorage()
      {
          return contextualInstances;
      }
      
      public Map<String, Object> getNameBeanKeyMap()
      {
          return nameBeanKeyMap;
      }
  
      /**
       *
       * @param bean
       * @param creationalContext
       * @param <T>
       * @return
       */
      public <T> T createContextualInstance(Contextual<T> bean, CreationalContext<T> creationalContext)
      {
          Object beanKey = getBeanKey(bean);
  
          // simply create the contextual instance
          ContextualInstanceInfo<T> instanceInfo = new ContextualInstanceInfo<T>();
          instanceInfo.setCreationalContext(creationalContext);
          instanceInfo.setContextualInstance(bean.create(creationalContext));
  
          contextualInstances.put(beanKey, instanceInfo);
          if(bean instanceof Bean)
          {
              String name = ((Bean<T>) bean).getName();
              if (name != null)
             {
                 nameBeanKeyMap.put(name, beanKey);
             }
         }
 
         return instanceInfo.getContextualInstance();
     }
 
     /**
      * If the context is a passivating scope then we return
      * the passivationId of the Bean. Otherwise we use
      * the Bean directly.
      * @return the key to use in the context map
      */
     public <T> Object getBeanKey(Contextual<T> bean)
     {
         return ((PassivationCapable) bean).getId();
     }
 
     /**
      * Restores the Bean from its beanKey.
      * @see #getBeanKey(javax.enterprise.context.spi.Contextual)
      */
     public Contextual<?> getBean(FacesContext context, Object beanKey)
     {
         if (beanManager == null)
         {
             beanManager = CDIUtils.getBeanManager(context.getExternalContext());
         }
         return beanManager.getPassivationCapableBean((String) beanKey);
     }
     
     public boolean isActive()
     {
         return !deactivated;
     }
     
     public void deactivate()
     {
         deactivated = true;
     }
 }