/*
 * Copyright 2021 Hazelcast Inc.
 *
 * Licensed under the Hazelcast Community License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://hazelcast.com/hazelcast-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.jet.hadoop.impl;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;


/**
 * Adapted from code example from book
 * Hadoop: The Definitive Guide, Fourth Edition by Tom White (O'Reilly, 2014)
 * https://github.com/tomwhite/hadoop-book/blob/master/ch08-mr-types/src/main/java/WholeFileInputFormat.java
 */
public class WholeFileAsTextInputFormat extends FileInputFormat<NullWritable, Text> {

    @Override
    protected boolean isSplitable(JobContext context, Path file) {
        return false;
    }

    @Override
    public RecordReader<NullWritable, Text> createRecordReader(InputSplit split, TaskAttemptContext context) {
        return new WholeFileAsTextRecordReader();
    }
}
