/**
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.web.filter;
import org.exoplatform.container.ExoContainer;
import org.exoplatform.container.web.AbstractFilter;
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
/**
* This filter allows the rest of the platform to add their own filters without changing the web.xml
* file. It is based on {@link ExtensibleFilter} which is a component that supports plugin.
*
* Created by The eXo Platform SAS
* Author : Nicolas Filotto
* nicolas.filotto@exoplatform.com
* 25 sept. 2009
*/
public class GenericFilter extends AbstractFilter
{
/**
* @see javax.servlet.Filter#destroy()
*/
public void destroy()
{
}
/**
* This filter calls <code>doFilter</code> of the {@link ExtensibleFilter} of
* the current eXo container if it cans be found otherwise it releases filter
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
ServletException
{
ExoContainer container = getContainer();
ExtensibleFilter filter = (ExtensibleFilter)container.getComponentInstanceOfType(ExtensibleFilter.class);
if (filter == null)
{
chain.doFilter(request, response);
}
else
{
filter.doFilter(request, response, chain);
}
}
}