/*
    * 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.trinidad.webapp;
  
  import java.io.IOException;
  
  import javax.servlet.Filter;
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  
  import org.apache.myfaces.trinidad.logging.TrinidadLogger;
  
  /**
   * Servlet filter that ensures that Trinidad is properly initialized
   * by establishing a RequestContext object;  this filter also processes file
   * uploads.
   * <p>
   * @version $Name:  $ ($Revision: adfrt/faces/adf-faces-api/src/main/java/oracle/adf/view/faces/webapp/AdfFacesFilter.java#0 $) $Date: 10-nov-2005.19:08:29 $
   */
  public class TrinidadFilter implements Filter
  {
    public void init(
      FilterConfig filterConfig) throws ServletException
    {
      ClassLoader loader = Thread.currentThread().getContextClassLoader();
      if (loader == null)
        _LOG.severe("CANNOT_FIND_CONTEXT_CLASS_LOADER");
      else
      {
        try
        {
          Class<?> proxiedClass = loader.loadClass(
                        "org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl");
          _proxied = (Filter) proxiedClass.newInstance();
          _proxied.init(filterConfig);
        }
        catch (ClassNotFoundException cnfe)
        {
          _LOG.severe(cnfe);
        }
        catch (IllegalAccessException iae)
        {
          _LOG.severe(iae);
        }
        catch (InstantiationException ie)
        {
          _LOG.severe(ie);
        }
        catch (RuntimeException e)
        {
          // OC4J was not reporting these errors properly:
          _LOG.severe(e);
          throw e;
        }
      }
  
  
    }
  
    public void destroy()
    {
      if (_proxied != null)
        _proxied.destroy();
      _proxied = null;
    }
  
    public void doFilter(
      ServletRequest  request,
      ServletResponse response,
      FilterChain     chain) throws IOException, ServletException
    {
      if (_proxied != null)
        _proxied.doFilter(request, response, chain);
      else
        chain.doFilter(request, response);
    }
  
    private static final TrinidadLogger _LOG = TrinidadLogger.createTrinidadLogger(TrinidadFilter.class);
  
    private Filter _proxied;
 }