org.pentaho.hadoop.mapreduce.MockRecordReader.java Source code

Introduction

Here is the source code for org.pentaho.hadoop.mapreduce.MockRecordReader.java

Source

/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2017 by Hitachi Vantara : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed 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.pentaho.hadoop.mapreduce;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.RecordReader;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;

public class MockRecordReader implements RecordReader<Text, Text> {
    private Iterator<String> rowIter;
    int rowNum = -1;
    int totalRows;

    // Make them provide a pre-filled list so we don't confuse the overhead of generating strings
    // with the time it takes to run the mapper
    public MockRecordReader(List<String> rows) {
        totalRows = rows.size();
        rowIter = rows.iterator();
    }

    @Override
    public boolean next(Text key, Text value) throws IOException {
        if (!rowIter.hasNext()) {
            return false;
        }
        rowNum++;
        key.set(String.valueOf(rowNum));
        value.set(rowIter.next());
        return true;
    }

    @Override
    public Text createKey() {
        return new Text();
    }

    @Override
    public Text createValue() {
        return new Text();
    }

    @Override
    public long getPos() throws IOException {
        return rowNum;
    }

    @Override
    public void close() throws IOException {
    }

    @Override
    public float getProgress() throws IOException {
        return (rowNum + 1) / totalRows;
    }
}