content: /*
   * 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
   *
   *     https://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.trevni.avro.mapreduce;
  
  import java.io.IOException;
  
  import org.apache.avro.mapred.AvroKey;
  import org.apache.hadoop.io.NullWritable;
  import org.apache.hadoop.mapreduce.InputSplit;
  import org.apache.hadoop.mapreduce.RecordReader;
  import org.apache.hadoop.mapreduce.TaskAttemptContext;
  import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
  
  /**
   * An {@link org.apache.hadoop.mapreduce.InputFormat} for Trevni files.
   *
   * This implement was modeled off
   * {@link org.apache.avro.mapreduce.AvroKeyInputFormat} to allow for easy
   * transition
   *
   * A MapReduce InputFormat that can handle Trevni container files.
   *
   * <p>
   * Keys are AvroKey wrapper objects that contain the Trevni data. Since Trevni
   * container files store only records (not key/value pairs), the value from this
   * InputFormat is a NullWritable.
   * </p>
   *
   * <p>
   * A subset schema to be read may be specified with
   * {@link org.apache.avro.mapreduce.AvroJob#setInputKeySchema}.
   */
  public class AvroTrevniKeyInputFormat<T> extends FileInputFormat<AvroKey<T>, NullWritable> {
  
    @Override
    public RecordReader<AvroKey<T>, NullWritable> createRecordReader(InputSplit split, TaskAttemptContext context)
        throws IOException, InterruptedException {
  
      return new AvroTrevniKeyRecordReader<>();
    }
  
  }
  