001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.io.compress;
020
021import java.io.IOException;
022import java.io.InputStream;
023import java.io.OutputStream;
024
025import org.apache.commons.logging.Log;
026import org.apache.commons.logging.LogFactory;
027import org.apache.hadoop.classification.InterfaceAudience;
028import org.apache.hadoop.classification.InterfaceStability;
029import org.apache.hadoop.conf.Configurable;
030import org.apache.hadoop.conf.Configuration;
031import org.apache.hadoop.io.compress.zlib.ZlibDecompressor;
032import org.apache.hadoop.io.compress.zlib.ZlibFactory;
033
034@InterfaceAudience.Public
035@InterfaceStability.Evolving
036public class DefaultCodec implements Configurable, CompressionCodec, DirectDecompressionCodec {
037  private static final Log LOG = LogFactory.getLog(DefaultCodec.class);
038  
039  Configuration conf;
040
041  @Override
042  public void setConf(Configuration conf) {
043    this.conf = conf;
044  }
045  
046  @Override
047  public Configuration getConf() {
048    return conf;
049  }
050  
051  @Override
052  public CompressionOutputStream createOutputStream(OutputStream out) 
053  throws IOException {
054    return CompressionCodec.Util.
055        createOutputStreamWithCodecPool(this, conf, out);
056  }
057
058  @Override
059  public CompressionOutputStream createOutputStream(OutputStream out, 
060                                                    Compressor compressor) 
061  throws IOException {
062    return new CompressorStream(out, compressor, 
063                                conf.getInt("io.file.buffer.size", 4*1024));
064  }
065
066  @Override
067  public Class<? extends Compressor> getCompressorType() {
068    return ZlibFactory.getZlibCompressorType(conf);
069  }
070
071  @Override
072  public Compressor createCompressor() {
073    return ZlibFactory.getZlibCompressor(conf);
074  }
075
076  @Override
077  public CompressionInputStream createInputStream(InputStream in) 
078  throws IOException {
079    return CompressionCodec.Util.
080        createInputStreamWithCodecPool(this, conf, in);
081  }
082
083  @Override
084  public CompressionInputStream createInputStream(InputStream in, 
085                                                  Decompressor decompressor) 
086  throws IOException {
087    return new DecompressorStream(in, decompressor, 
088                                  conf.getInt("io.file.buffer.size", 4*1024));
089  }
090
091  @Override
092  public Class<? extends Decompressor> getDecompressorType() {
093    return ZlibFactory.getZlibDecompressorType(conf);
094  }
095
096  @Override
097  public Decompressor createDecompressor() {
098    return ZlibFactory.getZlibDecompressor(conf);
099  }
100  
101  /**
102   * {@inheritDoc}
103   */
104  @Override
105  public DirectDecompressor createDirectDecompressor() {
106    return ZlibFactory.getZlibDirectDecompressor(conf);
107  }
108  
109  
110  @Override
111  public String getDefaultExtension() {
112    return ".deflate";
113  }
114
115}