/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.server.dispatch;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
/**
* Represents the next filter in a filter chain. The final filter will
* be the servlet itself.
*/
public class ClassLoaderFilterChain implements FilterChain {
// Loader to use.
private final ClassLoader _loader;
private final FilterChain _next;
/**
* Creates a new FilterChainFilter.
*
* @param next the next filterChain
* @param filter the user's filter
*/
public ClassLoaderFilterChain(FilterChain next, ClassLoader loader)
{
_next = next;
_loader = loader;
}
/**
* Invokes the next filter in the chain or the final servlet at
* the end of the chain.
*
* @param request the servlet request
* @param response the servlet response
* @since Servlet 2.3
*/
public void doFilter(ServletRequest request,
ServletResponse response)
throws ServletException, IOException
{
Thread thread = Thread.currentThread();
ClassLoader oldLoader = thread.getContextClassLoader();
try {
thread.setContextClassLoader(_loader);
_next.doFilter(request, response);
} finally {
thread.setContextClassLoader(oldLoader);
}
}
}