public int doWrite(ByteChunk chunk,
    Response res) throws IOException 
{
    // --------------------------------------------------- OutputBuffer Methods
        if (compressionStream == null) {
            compressionStream = new GZIPOutputStream(fakeOutputStream);
        }
        compressionStream.write(chunk.getBytes(), chunk.getStart(), 
                                chunk.getLength());
        return chunk.getLength();
}

Write some bytes.

 public long end() throws IOException 
{
        if (compressionStream == null) {
            compressionStream = new GZIPOutputStream(fakeOutputStream);
        }
        compressionStream.finish();
        compressionStream.close();
        return ((OutputFilter) buffer).end();
}

End the current request. It is acceptable to write extra bytes using buffer.doWrite during the execution of this method.

 public ByteChunk getEncodingName() 
{
        return ENCODING;
}

Return the name of the associated encoding; Here, the value is "identity".

 public  void recycle() 
{
        // Set compression stream to null
        compressionStream = null;
}

Make the filter ready to process the next request.

 public  void setBuffer(OutputBuffer buffer) 
{
        this.buffer = buffer;
}

Set the next buffer in the filter pipeline.

 public  void setResponse(Response response) 
{

}

Some filters need additional parameters from the response. All the necessary reading can occur in that method, as this method is called after the response header processing is complete.