| /** |
| * 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.Path; |
| |
| /** |
| * {@link DefaultInputDemuxer} acts as a pass-through demuxer. It just opens |
| * each file and returns back the input stream. If the input is compressed, it |
| * would return a decompression stream. |
| */ |
| public class DefaultInputDemuxer implements InputDemuxer { |
| String name; |
| InputStream input; |
| |
| @Override |
| public void bindTo(Path path, Configuration conf) throws IOException { |
| if (name != null) { // re-binding before the previous one was consumed. |
| close(); |
| } |
| name = path.getName(); |
| |
| input = new PossiblyDecompressedInputStream(path, conf); |
| |
| return; |
| } |
| |
| @Override |
| public Pair<String, InputStream> getNext() throws IOException { |
| if (name != null) { |
| Pair<String, InputStream> ret = |
| new Pair<String, InputStream>(name, input); |
| name = null; |
| input = null; |
| return ret; |
| } |
| return null; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| try { |
| if (input != null) { |
| input.close(); |
| } |
| } finally { |
| name = null; |
| input = null; |
| } |
| } |
| } |