/*

  * 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.application;

 import javax.faces.application.Application;

 import javax.faces.application.ApplicationFactory;

 import javax.faces.context.ExternalContext;

 import javax.faces.context.FacesContext;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 /**

  * @author Manfred Geiler (latest modification by $Author: lu4242 $)

  * @author Thomas Spiegl

  * @version $Revision: 775008 $ $Date: 2009-05-15 00:23:20 -0500 (Fri, 15 May 2009) $

  */

 public class ApplicationFactoryImpl

     extends ApplicationFactory

 {

     private static final Log log = LogFactory.getLog(ApplicationFactoryImpl.class);

     /**

      * Application is thread-safe (see Application javadoc)

      * "Application represents a per-web-application singleton object..."

      * FactoryFinder has a ClassLoader-Factory Map. Since each webapp has it's

      * own ClassLoader, each webapp will have it's own private factory instances.

      */

     private Application _application;

     private boolean _myfacesInstanceAddedToApplicationMap = false;

     public ApplicationFactoryImpl()

     {

         createAndLogNewApplication();

     }

     private void createAndLogNewApplication() {

         _application = new ApplicationImpl();

         putApplicationOnMap();

         if (log.isTraceEnabled()) log.trace("New ApplicationFactory instance created");

     }

     public void purgeApplication(){

         createAndLogNewApplication();

     }

     public Application getApplication()

     {

         //Put it on ApplicationMap, so javax.faces.application.Application

         //class can find it. This allows wrapped jsf 1.1 application instances

         //to work correctly in jsf 1.2 as ri does.

         if (_application != null && !_myfacesInstanceAddedToApplicationMap)

         {

             putApplicationOnMap();

         }

         return _application;

     }

     public void setApplication(Application application)

     {

         if (application == null)

         {

             throw new NullPointerException("Cannot set a null application in the ApplicationFactory");

         }

         _application = application;

         putApplicationOnMap();

     }

     private void putApplicationOnMap()

     {

         FacesContext facesContext = FacesContext.getCurrentInstance();

         if (facesContext != null)

         {

             ExternalContext externalContext = facesContext.getExternalContext();

             if (externalContext != null)

             {

                 externalContext.

                     getApplicationMap().put("org.apache.myfaces.application.ApplicationImpl", _application);

                 _myfacesInstanceAddedToApplicationMap = true;

             }

         }        

     }

 }