/*

  * 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;

     }

 }