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   * 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
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   *
   *     https://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
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  package org.apache.avro.specific;
  
  import org.apache.avro.Schema;
  import org.apache.avro.SchemaBuilder;
  import org.apache.avro.generic.GenericDatumReader;
  import org.apache.avro.generic.GenericDatumWriter;
  
  import org.apache.avro.io.EncoderFactory;
  import org.apache.avro.io.DecoderFactory;
  import org.apache.avro.io.DatumReader;
  import org.apache.avro.io.DatumWriter;
  import org.apache.avro.io.BinaryEncoder;
  import org.apache.avro.io.Decoder;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.math.BigDecimal;
  
  import static org.junit.Assert.assertEquals;
  
  public class TestSpecificRecordWithUnion {
    @Test
    void unionLogicalDecimalConversion() throws IOException {
      final TestUnionRecord record = TestUnionRecord.newBuilder().setAmount(BigDecimal.ZERO).build();
      final Schema schema = SchemaBuilder.unionOf().nullType().and().type(record.getSchema()).endUnion();
  
      byte[] recordBytes = serializeRecord(
          "{ \"org.apache.avro.specific.TestUnionRecord\": { \"amount\": { \"bytes\": \"\\u0000\" } } }", schema);
  
      SpecificDatumReader<SpecificRecord> specificDatumReader = new SpecificDatumReader<>(schema);
      ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(recordBytes);
      Decoder decoder = DecoderFactory.get().binaryDecoder(byteArrayInputStream, null);
      final SpecificRecord deserialized = specificDatumReader.read(null, decoder);
      assertEquals(record, deserialized);
    }
  
    public static byte[] serializeRecord(String value, Schema schema) throws IOException {
      DatumReader<Object> reader = new GenericDatumReader<>(schema);
      Object object = reader.read(null, DecoderFactory.get().jsonDecoder(schema, value));
      ByteArrayOutputStream out = new ByteArrayOutputStream();
      BinaryEncoder encoder = EncoderFactory.get().directBinaryEncoder(out, null);
      DatumWriter<Object> writer = new GenericDatumWriter<>(schema);
      writer.write(object, encoder);
      encoder.flush();
      byte[] bytes = out.toByteArray();
      out.close();
      return bytes;
    }
  }
  