Jetty example source code file (IncludableGzipFilter.java)

This example Jetty source code file (IncludableGzipFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Jetty tags/keywords

content-encoding, gzipfilter, gzipresponsewrapper, gzipstream, http, httpconnection, httpservletresponse, httpservletresponse, includablegzipfilter, includablegzipstream, includablegzipstream, includableresponsewrapper, includableresponsewrapper, io, ioexception, ioexception, request, response, servlet

The Jetty IncludableGzipFilter.java source code

package org.mortbay.servlet.jetty;

import java.io.IOException;

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

import org.mortbay.jetty.HttpConnection;
import org.mortbay.servlet.GzipFilter;

/* ------------------------------------------------------------ */
/** Includable GZip Filter.
 * This extension to the {@link GzipFilter} that uses Jetty APIs to allow
 * headers to be set during calls to 
 * {@link javax.servlet.RequestDispatcher#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)}.
 * This allows the gzip filter to function correct during includes and to make a decision to gzip or not
 * at the time the buffer fills and on the basis of all response headers.
 * 
 * @author gregw
 *
 */
public class IncludableGzipFilter extends GzipFilter
{

    protected GZIPResponseWrapper newGZIPResponseWrapper(HttpServletRequest request, HttpServletResponse response)
    {
        return new IncludableResponseWrapper(request,response);
    }

    public class IncludableResponseWrapper extends GzipFilter.GZIPResponseWrapper
    {
        public IncludableResponseWrapper(HttpServletRequest request, HttpServletResponse response)
        {
            super(request,response);
        }
        
        protected GzipStream newGzipStream(HttpServletRequest request,HttpServletResponse response,long contentLength,int bufferSize, int minGzipSize) throws IOException
        {
            return new IncludableGzipStream(request,response,contentLength,bufferSize,minGzipSize);
        }
    }
    
    public class IncludableGzipStream extends GzipFilter.GzipStream
    {
        public IncludableGzipStream(HttpServletRequest request, HttpServletResponse response, long contentLength, int bufferSize, int minGzipSize)
                throws IOException
        {
            super(request,response,contentLength,bufferSize,minGzipSize);
        }

        protected boolean setContentEncodingGzip()
        {
            HttpConnection connection = HttpConnection.getCurrentConnection();
            connection.getResponseFields().put("Content-Encoding", "gzip");
            return true;
        }
        
    }
    
}