| /* |
| * 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.sysds.runtime.util; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| |
| import org.apache.hadoop.io.LongWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapred.FileSplit; |
| import org.apache.hadoop.mapred.InputFormat; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordReader; |
| import org.apache.hadoop.mapred.Reporter; |
| |
| /** |
| * Custom input format and record reader to redirect common implementation of csv read |
| * over record readers (which are required for the parallel readers) to an input stream. |
| * |
| */ |
| public class InputStreamInputFormat implements InputFormat<LongWritable, Text> |
| { |
| private final InputStream _input; |
| |
| public InputStreamInputFormat(InputStream is) { |
| _input = is; |
| } |
| |
| @Override |
| public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException { |
| //return dummy handle - stream accessed purely over record reader |
| return new InputSplit[]{new FileSplit(null)}; |
| } |
| |
| @Override |
| public RecordReader<LongWritable,Text> getRecordReader(InputSplit split, JobConf job, Reporter reporter) throws IOException { |
| return new InputStreamRecordReader(_input); |
| } |
| |
| private static class InputStreamRecordReader implements RecordReader<LongWritable, Text> |
| { |
| private final BufferedReader _reader; |
| |
| public InputStreamRecordReader(InputStream is) { |
| _reader = new BufferedReader(new InputStreamReader( is )); |
| } |
| |
| @Override |
| public LongWritable createKey() { |
| return new LongWritable(); |
| } |
| @Override |
| public Text createValue() { |
| return new Text(); |
| } |
| @Override |
| public float getProgress() throws IOException { |
| return 0; |
| } |
| @Override |
| public long getPos() throws IOException { |
| return 0; |
| } |
| @Override |
| public boolean next(LongWritable key, Text value) throws IOException { |
| String line = _reader.readLine(); |
| if( line != null ) |
| value.set(line); |
| return (line != null); |
| } |
| @Override |
| public void close() throws IOException { |
| _reader.close(); |
| } |
| } |
| } |