/*

  * 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.config.annotation;

 import java.lang.reflect.InvocationTargetException;

 import java.util.Map;

 import java.util.WeakHashMap;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javax.faces.FacesException;

 import javax.faces.context.ExternalContext;

 import javax.faces.context.FacesContext;

 import javax.naming.NamingException;

 import org.apache.myfaces.shared.util.ClassUtils;

 import org.apache.tomcat.InstanceManager;

 /**

  * An annotation lifecycle provider for Tomcat 7.

  */

 public class Tomcat7AnnotationLifecycleProvider implements

         DiscoverableLifecycleProvider, LifecycleProvider2

 {

     private static Logger log = Logger.getLogger(TomcatAnnotationLifecycleProvider.class.getName());

     private WeakHashMap<ClassLoader, InstanceManager> instanceManagers = null;

     public Tomcat7AnnotationLifecycleProvider(ExternalContext externalContext)

     {

         instanceManagers = new WeakHashMap<ClassLoader, InstanceManager>();

     }

     public Object newInstance(String className)

             throws ClassNotFoundException, IllegalAccessException,

             InstantiationException, NamingException, InvocationTargetException

     {

         Class<?> clazz = ClassUtils.classForName(className);

         if (log.isLoggable(Level.FINEST))

         {

             log.finest("Creating instance of " + className);

         }

         Object object = clazz.newInstance();

         return object;

     }

     public void destroyInstance(Object instance)

             throws IllegalAccessException, InvocationTargetException

     {

         InstanceManager manager = instanceManagers

                 .get(ClassUtils.getContextClassLoader());

         if (manager != null)

         {

             manager.destroyInstance(instance);

         }

     }

     public void postConstruct(Object instance)

             throws IllegalAccessException, InvocationTargetException

     {

         InstanceManager manager = instanceManagers

                 .get(ClassUtils.getContextClassLoader());

         if (manager == null)

         {

             //Initialize manager

             manager = initManager();

         }

         //Is initialized

         if (manager != null)

         {

             //Inject resources

             try 

             {

                 manager.newInstance(instance);

             }

             catch (NamingException e)

             {

                 throw new FacesException(e);

             }

         }

     }

     public boolean isAvailable()

     {

         try

         {

             Class.forName("org.apache.tomcat.InstanceManager",

                     true, ClassUtils.getContextClassLoader());

             return true;

         }

         catch (Exception e)

         {

             // ignore

         }

         return false;

     }

     private InstanceManager initManager()

     {

         FacesContext context = FacesContext.getCurrentInstance();

         if (context == null)

         {

             return null;

         }

         ExternalContext extCtx = context.getExternalContext();

         if (extCtx == null)

         {

             return null;

         }

         // get application map to access ServletContext attributes

         Map<String, Object> applicationMap = extCtx.getApplicationMap();

         InstanceManager instanceManager = (InstanceManager)

                 applicationMap.get(InstanceManager.class.getName());

         if (instanceManager != null)

         {

             instanceManagers.put(ClassUtils.getContextClassLoader(),

                     instanceManager);

         }

         return instanceManager;

     }

 }