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
019 package org.apache.hadoop.io.compress;
020
021 import java.io.IOException;
022 import java.io.InputStream;
023 import java.io.OutputStream;
024
025 import org.apache.commons.logging.Log;
026 import org.apache.commons.logging.LogFactory;
027 import org.apache.hadoop.classification.InterfaceAudience;
028 import org.apache.hadoop.classification.InterfaceStability;
029 import org.apache.hadoop.conf.Configurable;
030 import org.apache.hadoop.conf.Configuration;
031 import org.apache.hadoop.io.compress.zlib.ZlibFactory;
032
033 @InterfaceAudience.Public
034 @InterfaceStability.Evolving
035 public class DefaultCodec implements Configurable, CompressionCodec {
036 private static final Log LOG = LogFactory.getLog(DefaultCodec.class);
037
038 Configuration conf;
039
040 public void setConf(Configuration conf) {
041 this.conf = conf;
042 }
043
044 public Configuration getConf() {
045 return conf;
046 }
047
048 public CompressionOutputStream createOutputStream(OutputStream out)
049 throws IOException {
050 // This may leak memory if called in a loop. The createCompressor() call
051 // may cause allocation of an untracked direct-backed buffer if native
052 // libs are being used (even if you close the stream). A Compressor
053 // object should be reused between successive calls.
054 LOG.warn("DefaultCodec.createOutputStream() may leak memory. "
055 + "Create a compressor first.");
056 return new CompressorStream(out, createCompressor(),
057 conf.getInt("io.file.buffer.size", 4*1024));
058 }
059
060 public CompressionOutputStream createOutputStream(OutputStream out,
061 Compressor compressor)
062 throws IOException {
063 return new CompressorStream(out, compressor,
064 conf.getInt("io.file.buffer.size", 4*1024));
065 }
066
067 public Class<? extends Compressor> getCompressorType() {
068 return ZlibFactory.getZlibCompressorType(conf);
069 }
070
071 public Compressor createCompressor() {
072 return ZlibFactory.getZlibCompressor(conf);
073 }
074
075 public CompressionInputStream createInputStream(InputStream in)
076 throws IOException {
077 return new DecompressorStream(in, createDecompressor(),
078 conf.getInt("io.file.buffer.size", 4*1024));
079 }
080
081 public CompressionInputStream createInputStream(InputStream in,
082 Decompressor decompressor)
083 throws IOException {
084 return new DecompressorStream(in, decompressor,
085 conf.getInt("io.file.buffer.size", 4*1024));
086 }
087
088 public Class<? extends Decompressor> getDecompressorType() {
089 return ZlibFactory.getZlibDecompressorType(conf);
090 }
091
092 public Decompressor createDecompressor() {
093 return ZlibFactory.getZlibDecompressor(conf);
094 }
095
096 public String getDefaultExtension() {
097 return ".deflate";
098 }
099
100 }