/*

  * 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 org.apache.myfaces.config.DefaultFacesConfigurationProvider;

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

 import org.apache.myfaces.spi.FacesConfigurationProvider;

 import org.apache.myfaces.spi.FacesConfigurationProviderFactory;

 import org.apache.myfaces.spi.ServiceProviderFinderFactory;

 import javax.faces.FacesException;

 import javax.faces.context.ExternalContext;

 import java.lang.reflect.InvocationTargetException;

 import java.security.AccessController;

 import java.security.PrivilegedActionException;

 import java.security.PrivilegedExceptionAction;

 import java.util.List;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 /**

  * 

  * @author Leonardo Uribe

  * @since 2.0.3

  */

 public class DefaultFacesConfigurationProviderFactory extends FacesConfigurationProviderFactory

 {

     public static final String FACES_CONFIGURATION_PROVIDER = FacesConfigurationProvider.class.getName();

     public static final String FACES_CONFIGURATION_PROVIDER_LIST = FacesConfigurationProvider.class.getName()+".LIST";

     public static final String FACES_CONFIGURATION_PROVIDER_INSTANCE_KEY

             = FacesConfigurationProvider.class.getName() + ".INSTANCE";

     private Logger getLogger()

     {

         return Logger.getLogger(DefaultFacesConfigurationProviderFactory.class.getName());

     }

     @Override

     public FacesConfigurationProvider getFacesConfigurationProvider(

             ExternalContext externalContext)

     {

         FacesConfigurationProvider returnValue = (FacesConfigurationProvider)

                 externalContext.getApplicationMap().get(FACES_CONFIGURATION_PROVIDER_INSTANCE_KEY);

         if (returnValue == null)

         {

             final ExternalContext extContext = externalContext;

             try

             {

                 if (System.getSecurityManager() != null)

                 {

                     returnValue

                             = AccessController.doPrivileged(new PrivilegedExceptionAction<FacesConfigurationProvider>()

                             {

                                 public FacesConfigurationProvider run() throws ClassNotFoundException,

                                         NoClassDefFoundError,

                                         InstantiationException,

                                         IllegalAccessException,

                                         InvocationTargetException,

                                         PrivilegedActionException

                                 {

                                     return resolveFacesConfigurationProviderFromService(extContext);

                                 }

                             });

                 }

                 else

                 {

                     returnValue = resolveFacesConfigurationProviderFromService(extContext);

                 }

                 externalContext.getApplicationMap().put(FACES_CONFIGURATION_PROVIDER_INSTANCE_KEY, returnValue);

             }

             catch (ClassNotFoundException e)

             {

                 // ignore

             }

             catch (NoClassDefFoundError e)

             {

                 // ignore

             }

             catch (InstantiationException e)

             {

                 getLogger().log(Level.SEVERE, "", e);

             }

             catch (IllegalAccessException e)

             {

                 getLogger().log(Level.SEVERE, "", e);

             }

             catch (InvocationTargetException e)

             {

                 getLogger().log(Level.SEVERE, "", e);

             }

             catch (PrivilegedActionException e)

             {

                 throw new FacesException(e);

             }

         }

         return returnValue;

     }

     private FacesConfigurationProvider resolveFacesConfigurationProviderFromService(

             ExternalContext externalContext) throws ClassNotFoundException,

             NoClassDefFoundError,

             InstantiationException,

             IllegalAccessException,

             InvocationTargetException,

             PrivilegedActionException

     {

         List<String> classList = (List<String>)

                 externalContext.getApplicationMap().get(FACES_CONFIGURATION_PROVIDER_LIST);

         if (classList == null)

         {

             classList = ServiceProviderFinderFactory.getServiceProviderFinder(externalContext).

                     getServiceProviderList(FACES_CONFIGURATION_PROVIDER);

             externalContext.getApplicationMap().put(FACES_CONFIGURATION_PROVIDER_LIST, classList);

         }

         return ClassUtils.buildApplicationObject(FacesConfigurationProvider.class, classList,

                                                  new DefaultFacesConfigurationProvider());

     }

 }