/*
    * 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.webapp;
  
  import java.io.IOException;
  
  import javax.faces.context.FacesContext;
  import javax.faces.webapp.FacesServlet;
  import javax.servlet.Servlet;
  import javax.servlet.ServletConfig;
  import javax.servlet.ServletContext;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.myfaces.shared_impl.webapp.webxml.DelegatedFacesServlet;
  import org.apache.myfaces.util.ContainerUtils;
  
  /**
   * Derived FacesServlet that can be used for debugging purpose
   * and to fix the Weblogic startup issue (FacesServlet is initialized before ServletContextListener).
   *
   * @author Manfred Geiler (latest modification by $Author: lu4242 $)
   * @version $Revision: 1067544 $ $Date: 2011-02-05 17:33:47 -0500 (Sat, 05 Feb 2011) $
   */
  public class MyFacesServlet implements Servlet, DelegatedFacesServlet
  {
      private static final Log log = LogFactory.getLog(MyFacesServlet.class);
  
      private final FacesServlet delegate = new FacesServlet();
      
      private FacesInitializer _facesInitializer;
      
      protected FacesInitializer getFacesInitializer()
      {
          if (_facesInitializer == null)
          {
              if (ContainerUtils.isJsp21()) 
              {
                  _facesInitializer = new Jsp21FacesInitializer();
              } 
              else 
              {
                  _facesInitializer = new Jsp20FacesInitializer();
              }
          }
          
          return _facesInitializer;
      }
      
      public void setFacesInitializer(FacesInitializer facesInitializer)
      {
          _facesInitializer = facesInitializer;
      }
  
      public void destroy()
      {
          delegate.destroy();
      }
  
      public ServletConfig getServletConfig()
      {
          return delegate.getServletConfig();
      }
  
      public String getServletInfo()
      {
          return delegate.getServletInfo();
      }
  
      public void init(ServletConfig servletConfig)
          throws ServletException
      {
          //Check, if ServletContextListener already called
          ServletContext servletContext = servletConfig.getServletContext();
          
          FacesInitializer facesInitializer = getFacesInitializer();
          
          // Create startup FacesContext before initializing
          FacesContext facesContext = facesInitializer.initStartupFacesContext(servletContext);
  
         Boolean b = (Boolean)servletContext.getAttribute(StartupServletContextListener.FACES_INIT_DONE);
         if (b == null || b.booleanValue() == false)
         {
             if(log.isWarnEnabled())
             {
                 log.warn("ServletContextListener not yet called");
             }
             facesInitializer.initFaces(servletConfig.getServletContext());
         }
         
         // Destroy startup FacesContext
         facesInitializer.destroyStartupFacesContext(facesContext);
         
         delegate.init(servletConfig);
         log.info("MyFacesServlet for context '" + servletConfig.getServletContext().getRealPath("/") + "' initialized.");
     }
     
     public void service(ServletRequest request, ServletResponse response)
             throws IOException,
                    ServletException
     {
         if (log.isTraceEnabled()) log.trace("MyFacesServlet service start");
         delegate.service(request, response);
         if (log.isTraceEnabled()) log.trace("MyFacesServlet service finished");
     }
 
 }