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.avro.hadoop.io;
  
  import org.apache.avro.Schema;
  import org.apache.avro.io.DatumReader;
  import org.apache.avro.mapred.AvroValue;
  import org.apache.avro.mapred.AvroWrapper;
  
  /**
   * Deserializes AvroValue objects within Hadoop.
   *
   * @param <D> The java type of the avro data to deserialize.
   *
   * @see AvroDeserializer
   */
  public class AvroValueDeserializer<D> extends AvroDeserializer<AvroWrapper<D>, 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 AvroValueDeserializer(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 AvroValueDeserializer(Schema writerSchema, Schema readerSchema, DatumReader<D> datumReader) {
      super(writerSchema, readerSchema, datumReader);
    }
  
    /**
     * Creates a new empty <code>AvroValue</code> instance.
     *
     * @return a new empty AvroValue.
     */
    @Override
    protected AvroWrapper<D> createAvroWrapper() {
      return new AvroValue<>(null);
    }
  }
  