org.apache.avro.hadoop.io.AvroKeyDeserializer Maven / Gradle / Ivy
/**
* 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.avro.hadoop.io;
import org.apache.avro.Schema;
import org.apache.avro.io.DatumReader;
import org.apache.avro.mapred.AvroKey;
import org.apache.avro.mapred.AvroWrapper;
/**
* Deserializes AvroKey objects within Hadoop.
*
* @param The java type of the avro data to deserialize.
*
* @see AvroDeserializer
*/
public class AvroKeyDeserializer extends AvroDeserializer, D> {
/**
* Constructor.
*
* @param writerSchema The Avro writer schema for the data to deserialize.
* @param readerSchema The Avro reader schema for the data to deserialize.
*/
public AvroKeyDeserializer(Schema writerSchema, Schema readerSchema,
ClassLoader classLoader) {
super(writerSchema, readerSchema, classLoader);
}
/**
* Constructor.
*
* @param writerSchema The Avro writer schema for the data to deserialize.
* @param readerSchema The Avro reader schema for the data to deserialize.
* @param datumReader The Avro datum reader to use for deserialization.
*/
public AvroKeyDeserializer(Schema writerSchema, Schema readerSchema,
DatumReader datumReader) {
super(writerSchema, readerSchema, datumReader);
}
/**
* Creates a new empty AvroKey instance.
*
* @return a new empty AvroKey.
*/
@Override
protected AvroWrapper createAvroWrapper() {
return new AvroKey(null);
}
}