WGZIPFilter.java

/**
 * Copyright (C) 2008-2010, Squale Project - http://www.squale.org
 *
 * This file is part of Squale.
 *
 * Squale 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 3 of the
 * License, or any later version.
 *
 * Squale 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 General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Squale.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.squale.welcom.struts.filter;

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 javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author M327837 Pour changer le mod�le de ce commentaire de type g�n�r�, allez � :
 *         Fen�tre>Pr�f�rences>Java>G�n�ration de code>Code et commentaires
 */
public class WGZIPFilter
    implements Filter
{

    /**
     * La config
     */
    private FilterConfig config;

    /**
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse,
     *      javax.servlet.FilterChain)
     */
    public void doFilter( final ServletRequest req, final ServletResponse res, final FilterChain chain )
        throws IOException, ServletException
    {
        if ( req instanceof HttpServletRequest )
        {
            final HttpServletRequest request = (HttpServletRequest) req;
            final HttpServletResponse response = (HttpServletResponse) res;

            // si le navigateur accepte la compression, on zip le flux
            final String ae = request.getHeader( "accept-encoding" );

            if ( ( ae != null ) && ( ae.indexOf( "gzip" ) != -1 ) )
            {
                final GZIPResponseWrapper wrappedResponse = new GZIPResponseWrapper( response );
                chain.doFilter( req, wrappedResponse );
                wrappedResponse.finishResponse();

                return;
            }

            chain.doFilter( req, res );
        }
    }

    /**
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    public void init( final FilterConfig filterConfig )
    {
        config = filterConfig;
    }

    /**
     * @see javax.servlet.Filter#destroy()
     */
    public void destroy()
    {
        config = null;
    }
}