| /* |
| * 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.avro.mapreduce; |
| |
| import java.io.IOException; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.mapred.AvroKey; |
| import org.apache.hadoop.io.NullWritable; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Reads records from an input split representing a chunk of an Avro container |
| * file. |
| * |
| * @param <T> The (java) type of data in Avro container file. |
| */ |
| public class AvroKeyRecordReader<T> extends AvroRecordReaderBase<AvroKey<T>, NullWritable, T> { |
| private static final Logger LOG = LoggerFactory.getLogger(AvroKeyRecordReader.class); |
| |
| /** A reusable object to hold records of the Avro container file. */ |
| private final AvroKey<T> mCurrentRecord; |
| |
| /** |
| * Constructor. |
| * |
| * @param readerSchema The reader schema to use for the records in the Avro |
| * container file. |
| */ |
| public AvroKeyRecordReader(Schema readerSchema) { |
| super(readerSchema); |
| mCurrentRecord = new AvroKey<>(null); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean nextKeyValue() throws IOException, InterruptedException { |
| boolean hasNext = super.nextKeyValue(); |
| mCurrentRecord.datum(getCurrentRecord()); |
| return hasNext; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public AvroKey<T> getCurrentKey() throws IOException, InterruptedException { |
| return mCurrentRecord; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public NullWritable getCurrentValue() throws IOException, InterruptedException { |
| return NullWritable.get(); |
| } |
| } |