/*
    * 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 java.lang.reflect.InvocationTargetException;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  import javax.faces.context.ExternalContext;
  import javax.naming.NamingException;
  import javax.servlet.ServletContext;
  
  import org.apache.myfaces.spi.InjectionProvider;
  import org.apache.myfaces.spi.InjectionProviderException;
  
  public class TomcatAnnotationInjectionProvider extends InjectionProvider
  {
      private static Logger log = Logger.getLogger(TomcatAnnotationInjectionProvider.class.getName());
  
      private ExternalContext externalContext;
      private org.apache.AnnotationProcessor annotationProcessor;
  
      public TomcatAnnotationInjectionProvider(ExternalContext externalContext)
      {
          this.externalContext = externalContext;
      }
  
      @Override
      public Object inject(Object instance) throws InjectionProviderException
      {
          try
          {
              annotationProcessor.processAnnotations(instance);
          }
          catch (IllegalAccessException ex)
          {
              throw new InjectionProviderException(ex);
          }
          catch (InvocationTargetException ex)
          {
              throw new InjectionProviderException(ex);
          }
          catch (NamingException ex)
          {
              throw new InjectionProviderException(ex);
          }
          return null;
      }
  
      @Override
      public void preDestroy(Object instance, Object creationMetaData) throws InjectionProviderException
      {
          if (log.isLoggable(Level.FINEST))
          {
              log.info("Destroy instance of " + instance.getClass().getName());
          }
          try
          {
              annotationProcessor.preDestroy(instance);
          }
          catch (IllegalAccessException ex)
          {
              throw new InjectionProviderException(ex);
          }
          catch (InvocationTargetException ex)
          {
              throw new InjectionProviderException(ex);
          }
      }
  
      @Override
      public boolean isAvailable()
      {
          try
          {
              annotationProcessor =  (org.apache.AnnotationProcessor) ((ServletContext)
                       externalContext.getContext()).getAttribute(org.apache.AnnotationProcessor.class.getName());
              return annotationProcessor != null;
          }
          catch (Throwable e)
          {
              // ignore
          }
         return false;
     }
 
     @Override
     public void postConstruct(Object instance, Object creationMetaData) throws InjectionProviderException
     {
         try
         {
             annotationProcessor.postConstruct(instance);
         }
         catch (IllegalAccessException ex)
         {
             throw new InjectionProviderException(ex);
         }
         catch (InvocationTargetException ex)
         {
             throw new InjectionProviderException(ex);
         }
     }
 }