/*
 * 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.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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 Log LOG = LogFactory.getLog(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);
    }
  }
}

