hadoop DefaultCodec 源码
haddop DefaultCodec 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/DefaultCodec.java
/*
* 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
*
* 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 org.apache.hadoop.io.compress;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.compress.zlib.ZlibFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_DEFAULT;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_KEY;
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class DefaultCodec implements Configurable, CompressionCodec, DirectDecompressionCodec {
private static final Logger LOG = LoggerFactory.getLogger(DefaultCodec.class);
Configuration conf;
@Override
public void setConf(Configuration conf) {
this.conf = conf;
}
@Override
public Configuration getConf() {
return conf;
}
@Override
public CompressionOutputStream createOutputStream(OutputStream out)
throws IOException {
return CompressionCodec.Util.
createOutputStreamWithCodecPool(this, conf, out);
}
@Override
public CompressionOutputStream createOutputStream(OutputStream out,
Compressor compressor)
throws IOException {
return new CompressorStream(out, compressor,
conf.getInt(IO_FILE_BUFFER_SIZE_KEY,
IO_FILE_BUFFER_SIZE_DEFAULT));
}
@Override
public Class<? extends Compressor> getCompressorType() {
return ZlibFactory.getZlibCompressorType(conf);
}
@Override
public Compressor createCompressor() {
return ZlibFactory.getZlibCompressor(conf);
}
@Override
public CompressionInputStream createInputStream(InputStream in)
throws IOException {
return CompressionCodec.Util.
createInputStreamWithCodecPool(this, conf, in);
}
@Override
public CompressionInputStream createInputStream(InputStream in,
Decompressor decompressor)
throws IOException {
return new DecompressorStream(in, decompressor,
conf.getInt(IO_FILE_BUFFER_SIZE_KEY,
IO_FILE_BUFFER_SIZE_DEFAULT));
}
@Override
public Class<? extends Decompressor> getDecompressorType() {
return ZlibFactory.getZlibDecompressorType(conf);
}
@Override
public Decompressor createDecompressor() {
return ZlibFactory.getZlibDecompressor(conf);
}
/**
* {@inheritDoc}
*/
@Override
public DirectDecompressor createDirectDecompressor() {
return ZlibFactory.getZlibDirectDecompressor(conf);
}
@Override
public String getDefaultExtension() {
return CodecConstants.DEFAULT_CODEC_EXTENSION;
}
}
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