/* 
    P/P   *  Method: net.sourceforge.pebble.web.filter.GZIPFilter__static_init
          */
     1  /*
     2   * Copyright (c) 2003-2006, Simon Brown
     3   * All rights reserved.
     4   *
     5   * Redistribution and use in source and binary forms, with or without
     6   * modification, are permitted provided that the following conditions are met:
     7   *
     8   *   - Redistributions of source code must retain the above copyright
     9   *     notice, this list of conditions and the following disclaimer.
    10   *
    11   *   - Redistributions in binary form must reproduce the above copyright
    12   *     notice, this list of conditions and the following disclaimer in
    13   *     the documentation and/or other materials provided with the
    14   *     distribution.
    15   *
    16   *   - Neither the name of Pebble nor the names of its contributors may
    17   *     be used to endorse or promote products derived from this software
    18   *     without specific prior written permission.
    19   *
    20   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    21   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    22   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    23   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    24   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    25   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    26   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    27   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    28   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    29   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    30   * POSSIBILITY OF SUCH DAMAGE.
    31   */
    32  package net.sourceforge.pebble.web.filter;
    33  
    34  import javax.servlet.*;
         /* 
    P/P   *  Method: void net.sourceforge.pebble.web.filter.GZIPFilter()
          */
    35  import javax.servlet.http.HttpServletRequest;
    36  import javax.servlet.http.HttpServletResponse;
    37  import java.io.IOException;
    38  
    39  public class GZIPFilter implements Filter {
    40  
           /* 
    P/P     *  Method: void doFilter(ServletRequest, ServletResponse, FilterChain)
            * 
            *  Preconditions:
            *    chain != null
            *    req != null
            * 
            *  Test Vectors:
            *    java.lang.String:indexOf(...)@48: {-1}, {-231..-2, 0..232-1}
            *    javax.servlet.http.HttpServletRequest:getHeader(...)@47: Addr_Set{null}, Inverse{null}
            */
    41    public void doFilter(ServletRequest req, ServletResponse res,
    42                         FilterChain chain) throws IOException, ServletException {
    43  
    44        HttpServletRequest request = (HttpServletRequest) req;
    45        HttpServletResponse response = (HttpServletResponse) res;
    46  
    47        String ae = request.getHeader("Accept-Encoding");
    48        if (ae != null && ae.indexOf("gzip") != -1) {
    49          GZIPResponseWrapper wrappedResponse = new GZIPResponseWrapper(response);
    50          chain.doFilter(req, wrappedResponse);
    51          wrappedResponse.finishResponse();
    52        } else {
    53          chain.doFilter(req, res);
    54        }
    55    }
    56  
           /* 
    P/P     *  Method: void init(FilterConfig)
            */
    57    public void init(FilterConfig filterConfig) {
    58    }
    59  
           /* 
    P/P     *  Method: void destroy()
            */
    60    public void destroy() {
    61    }
    62  
    63  }