/*
 * 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.hive.hcatalog.templeton.tool;

import java.io.IOException;

import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

/**
 * An empty record reader.
 */
public class NullRecordReader
  extends RecordReader<NullWritable, NullWritable> {
  @Override
  public void initialize(InputSplit genericSplit, TaskAttemptContext context)
    throws IOException {
  }

  @Override
  public void close() throws IOException {
  }

  @Override
  public NullWritable getCurrentKey() {
    return NullWritable.get();
  }

  @Override
  public NullWritable getCurrentValue() {
    return NullWritable.get();
  }

  @Override
  public float getProgress() {
    return 1.0f;
  }

  @Override
  public boolean nextKeyValue() throws IOException {
    return false;
  }
}

