/*
    * 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.tobago.webapp;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.apache.myfaces.tobago.config.TobagoConfig;
  
  import javax.faces.FactoryFinder;
  import javax.faces.lifecycle.LifecycleFactory;
  import javax.servlet.ServletContextEvent;
  import javax.servlet.ServletContextListener;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  
  /**
   * Workaround: Weblogic 8.1 calls the ContextListeners after calling
   * Servlet.init() but, JSF assume it does it before.
   * Maybe weblogic doesn't call ContextListeners from *.jar!
   *
   * @see <a href="http://forum.java.sun.com/thread.jsp?forum=427&thread=499690">
   *      WLS8.1 & JSF 1.0 Final: "Faces Servlet" failed to preload</a>
   */
  public class WeblogicWorkaroundServlet extends HttpServlet {
  
    private static final long serialVersionUID = -8636608446986072719L;
  
    private static final Logger LOG = LoggerFactory.getLogger(WeblogicWorkaroundServlet.class);
  
    public void init() throws ServletException {
      if (LOG.isDebugEnabled()) {
        LOG.debug("1st");
      }
      LifecycleFactory factory = (LifecycleFactory)
          FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
  
      if (factory == null) { // Faces ConfigureListener is not called until now!
        final String className = "com.sun.faces.config.ConfigureListener";
        if (LOG.isDebugEnabled()) {
          LOG.debug("Init of " + className + " by servlet!");
        }
        callInit(className);
      }
  
      if (LOG.isDebugEnabled()) {
        LOG.debug("2nd");
      }
      TobagoConfig tobagoConfig = (TobagoConfig)
          getServletContext().getAttribute(TobagoConfig.TOBAGO_CONFIG);
  
      if (tobagoConfig == null) { // TobagoServletContextListener is not called until now!
        final String className = TobagoServletContextListener.class.getName();
        if (LOG.isDebugEnabled()) {
          LOG.debug("Init of " + className + " by servlet!");
        }
        callInit(className);
      }
  
      if (LOG.isDebugEnabled()) {
        LOG.debug("3rd");
      }
    }
  
    private void callInit(String className) {
      try {
        Class aClass = Class.forName(className);
        ServletContextListener listener = (ServletContextListener) aClass.newInstance();
        listener.contextInitialized(new ServletContextEvent(getServletContext()));
      } catch (ClassNotFoundException e) {
        LOG.error("", e);
      } catch (IllegalAccessException e) {
        LOG.error("", e);
      } catch (InstantiationException e) {
        LOG.error("", e);
      }
    }
  }