GZIPFilter.java

/*
 * Copyright 2003 Jayson Falkner (jayson@jspinsider.com)
 * This code is from "Servlets and JavaServer pages; the J2EE Web Tier",
 * http://www.jspbook.com. You may freely use the code both commercially
 * and non-commercially. If you like the code, please pick up a copy of
 * the book and help support the authors, development of more free code,
 * and the JSP/Servlet/J2EE community.
 *
 *  See http://www.onjava.com/pub/a/onjava/2003/11/19/filters.html
 *
 */
package org.freehep.webutil.compress;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.freehep.webutil.compress.GZIPResponseWrapper;

public class GZIPFilter implements Filter {

  public void doFilter(ServletRequest req, ServletResponse res,
      FilterChain chain) throws IOException, ServletException {
    if (req instanceof HttpServletRequest) {
      HttpServletRequest request = (HttpServletRequest) req;
      HttpServletResponse response = (HttpServletResponse) res;
      String ae = request.getHeader("accept-encoding");
      if (ae != null && ae.indexOf("gzip") != -1) {
        GZIPResponseWrapper wrappedResponse =
          new GZIPResponseWrapper(response);
        chain.doFilter(req, wrappedResponse);
        wrappedResponse.finishResponse();
        return;
      }
      chain.doFilter(req, res);
    }
  }

  public void init(FilterConfig filterConfig) {
    // noop
  }

  public void destroy() {
    // noop
  }
}