View Javadoc

    1   /*
    2    * Copyright 2012 The Netty Project
    3    *
    4    * The Netty Project licenses this file to you under the Apache License,
    5    * version 2.0 (the "License"); you may not use this file except in compliance
    6    * with the 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  public class HttpContentDecompressor extends HttpContentDecoder {
    29      @Override
    30      protected DecoderEmbedder<ChannelBuffer> newContentDecoder(String contentEncoding) throws Exception {
    31          if ("gzip".equalsIgnoreCase(contentEncoding) || "x-gzip".equalsIgnoreCase(contentEncoding)) {
    32              return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.GZIP));
    33          } else if ("deflate".equalsIgnoreCase(contentEncoding) || "x-deflate".equalsIgnoreCase(contentEncoding)) {
    34              // To be strict, 'deflate' means ZLIB, but some servers were not implemented correctly.
    35              return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.ZLIB_OR_NONE));
    36          }
    37
    38          // 'identity' or unsupported
    39          return null;
    40      }
    41  }