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    1   /*
    2    * Copyright 2009 Red Hat, Inc.
    3    *
    4    * Red Hat licenses this file to you under the Apache License, version 2.0
    5    * (the "License"); you may not use this file except in compliance with the
    6    * License.  You may obtain a copy of the License at:
    7    *
    8    *    http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    13   * License for the specific language governing permissions and limitations
    14   * under the License.
    15   */
    16  package org.jboss.netty.handler.codec.http;
    17
    18  import org.jboss.netty.buffer.ChannelBuffer;
    19  import org.jboss.netty.handler.codec.compression.ZlibDecoder;
    20  import org.jboss.netty.handler.codec.compression.ZlibWrapper;
    21  import org.jboss.netty.handler.codec.embedder.DecoderEmbedder;
    22
    23  /**
    24   * Decompresses an {@link HttpMessage} and an {@link HttpChunk} compressed in
    25   * {@code gzip} or {@code deflate} encoding.  For more information on how this
    26   * handler modifies the message, please refer to {@link HttpContentDecoder}.
    27   *
    28   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    29   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    30   * @version $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
    31   */
    32  public class HttpContentDecompressor extends HttpContentDecoder {
    33      @Override
    34      protected DecoderEmbedder<ChannelBuffer> newContentDecoder(String contentEncoding) throws Exception {
    35          if ("gzip".equalsIgnoreCase(contentEncoding) || "x-gzip".equalsIgnoreCase(contentEncoding)) {
    36              return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.GZIP));
    37          } else if ("deflate".equalsIgnoreCase(contentEncoding) || "x-deflate".equalsIgnoreCase(contentEncoding)) {
    38              return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.ZLIB));
    39          }
    40
    41          // 'identity' or unsupported
    42          return null;
    43      }
    44  }