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   *  Licensed to the Apache Software Foundation (ASF) under one or more
   *  contributor license agreements.  See the NOTICE file distributed with
   *  this work for additional information regarding copyright ownership.
   *  The ASF licenses this file to You under the Apache License, Version 2.0
   *  (the "License"); you may not use this file except in compliance with
   *  the License.  You may obtain a copy of the License at
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
 package org.apache.coyote.http11.filters;
Gzip output filter.

Remy Maucherat
 public class GzipOutputFilter implements OutputFilter {
     // -------------------------------------------------------------- Constants
     protected static final String ENCODING_NAME = "gzip";
     protected static final ByteChunk ENCODING = new ByteChunk();
     // ----------------------------------------------------- Static Initializer
     static {
     // ----------------------------------------------------- Instance Variables

Next buffer in the pipeline.
     protected OutputBuffer buffer;

Compression output stream.
     protected GZIPOutputStream compressionStream = null;

Fake internal output stream.
     protected OutputStream fakeOutputStream = new FakeOutputStream();
     // --------------------------------------------------- OutputBuffer Methods

Write some bytes.

number of bytes written by the filter
     public int doWrite(ByteChunk chunkResponse res)
         throws IOException {
         if ( == null) {
              = new GZIPOutputStream();
         .write(chunk.getBytes(), chunk.getStart(), 
         return chunk.getLength();
     // --------------------------------------------------- OutputFilter Methods

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.
    public void setResponse(Response response) {

Set the next buffer in the filter pipeline.
    public void setBuffer(OutputBuffer buffer) {
        this. = buffer;

End the current request. It is acceptable to write extra bytes using buffer.doWrite during the execution of this method.
    public long end()
        throws IOException {
        if ( == null) {
             = new GZIPOutputStream();
        return ((OutputFilter).end();

Make the filter ready to process the next request.
    public void recycle() {
        // Set compression stream to null
         = null;

Return the name of the associated encoding; Here, the value is "identity".
    public ByteChunk getEncodingName() {
        return ;
    // ------------------------------------------- FakeOutputStream Inner Class
    protected class FakeOutputStream
        extends OutputStream {
        protected ByteChunk outputChunk = new ByteChunk();
        protected byte[] singleByteBuffer = new byte[1];
        public void write(int b)
            throws IOException {
            // Shouldn't get used for good performance, but is needed for 
            // compatibility with Sun JDK 1.4.0
            [0] = (byte) (b & 0xff);
            .setBytes(, 0, 1);
        public void write(byte[] bint offint len)
            throws IOException {
        public void flush() throws IOException {}
        public void close() throws IOException {}
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