/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 com.facebook.presto.jdbc.internal.netty.handler.codec.http;
import com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffer;
import com.facebook.presto.jdbc.internal.netty.handler.codec.compression.ZlibDecoder;
import com.facebook.presto.jdbc.internal.netty.handler.codec.compression.ZlibWrapper;
import com.facebook.presto.jdbc.internal.netty.handler.codec.embedder.DecoderEmbedder;
/**
* Decompresses an {@link HttpMessage} and an {@link HttpChunk} compressed in
* {@code gzip} or {@code deflate} encoding. For more information on how this
* handler modifies the message, please refer to {@link HttpContentDecoder}.
*/
public class HttpContentDecompressor extends HttpContentDecoder {
@Override
protected DecoderEmbedder<ChannelBuffer> newContentDecoder(String contentEncoding) throws Exception {
if ("gzip".equalsIgnoreCase(contentEncoding) || "x-gzip".equalsIgnoreCase(contentEncoding)) {
return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.GZIP));
}
if ("deflate".equalsIgnoreCase(contentEncoding) || "x-deflate".equalsIgnoreCase(contentEncoding)) {
// To be strict, 'deflate' means ZLIB, but some servers were not implemented correctly.
return new DecoderEmbedder<ChannelBuffer>(new ZlibDecoder(ZlibWrapper.ZLIB_OR_NONE));
}
// 'identity' or unsupported
return null;
}
}