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    1   //========================================================================
    2   //Copyright 2004-2008 Mort Bay Consulting Pty. Ltd.
    3   //------------------------------------------------------------------------
    4   //Licensed under the Apache License, Version 2.0 (the "License");
    5   //you may not use this file except in compliance with the License.
    6   //You may obtain a copy of the License at
    7   //http://www.apache.org/licenses/LICENSE-2.0
    8   //Unless required by applicable law or agreed to in writing, software
    9   //distributed under the License is distributed on an "AS IS" BASIS,
    10  //WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  //See the License for the specific language governing permissions and
    12  //limitations under the License.
    13  //========================================================================
    14
    15  package org.mortbay.servlet.jetty;
    16
    17  import java.io.IOException;
    18
    19  import javax.servlet.http.HttpServletRequest;
    20  import javax.servlet.http.HttpServletResponse;
    21
    22  import org.mortbay.jetty.HttpConnection;
    23  import org.mortbay.servlet.GzipFilter;
    24
    25  /* ------------------------------------------------------------ */
    26  /** Includable GZip Filter.
    27   * This extension to the {@link GzipFilter} that uses Jetty APIs to allow
    28   * headers to be set during calls to
    29   * {@link javax.servlet.RequestDispatcher#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)}.
    30   * This allows the gzip filter to function correct during includes and to make a decision to gzip or not
    31   * at the time the buffer fills and on the basis of all response headers.
    32   *
    33   * @author gregw
    34   *
    35   */
    36  public class IncludableGzipFilter extends GzipFilter
    37  {
    38
    39      protected GZIPResponseWrapper newGZIPResponseWrapper(HttpServletRequest request, HttpServletResponse response)
    40      {
    41          return new IncludableResponseWrapper(request,response);
    42      }
    43
    44      public class IncludableResponseWrapper extends GzipFilter.GZIPResponseWrapper
    45      {
    46          public IncludableResponseWrapper(HttpServletRequest request, HttpServletResponse response)
    47          {
    48              super(request,response);
    49          }
    50
    51          protected GzipStream newGzipStream(HttpServletRequest request,HttpServletResponse response,long contentLength,int bufferSize, int minGzipSize) throws IOException
    52          {
    53              return new IncludableGzipStream(request,response,contentLength,bufferSize,minGzipSize);
    54          }
    55      }
    56
    57      public class IncludableGzipStream extends GzipFilter.GzipStream
    58      {
    59          public IncludableGzipStream(HttpServletRequest request, HttpServletResponse response, long contentLength, int bufferSize, int minGzipSize)
    60                  throws IOException
    61          {
    62              super(request,response,contentLength,bufferSize,minGzipSize);
    63          }
    64
    65          protected boolean setContentEncodingGzip()
    66          {
    67              HttpConnection connection = HttpConnection.getCurrentConnection();
    68              connection.getResponseFields().put("Content-Encoding", "gzip");
    69              return true;
    70          }
    71
    72      }
    73
    74  }