| /** |
| * 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.tools.rumen; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.compress.CodecPool; |
| import org.apache.hadoop.io.compress.CompressionCodec; |
| import org.apache.hadoop.io.compress.CompressionCodecFactory; |
| import org.apache.hadoop.io.compress.Decompressor; |
| |
| class PossiblyDecompressedInputStream extends InputStream { |
| private final Decompressor decompressor; |
| private final InputStream coreInputStream; |
| |
| public PossiblyDecompressedInputStream(Path inputPath, Configuration conf) |
| throws IOException { |
| CompressionCodecFactory codecs = new CompressionCodecFactory(conf); |
| CompressionCodec inputCodec = codecs.getCodec(inputPath); |
| |
| FileSystem ifs = inputPath.getFileSystem(conf); |
| FSDataInputStream fileIn = ifs.open(inputPath); |
| |
| if (inputCodec == null) { |
| decompressor = null; |
| coreInputStream = fileIn; |
| } else { |
| decompressor = CodecPool.getDecompressor(inputCodec); |
| coreInputStream = inputCodec.createInputStream(fileIn, decompressor); |
| } |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return coreInputStream.read(); |
| } |
| |
| @Override |
| public int read(byte[] buffer, int offset, int length) throws IOException { |
| return coreInputStream.read(buffer, offset, length); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (decompressor != null) { |
| CodecPool.returnDecompressor(decompressor); |
| } |
| |
| coreInputStream.close(); |
| } |
| |
| } |