lang/java/avro/src/test/java/org/apache/avro/generic/TestGenericConcreteEnum.java

/*
 * 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.generic;

import org.apache.avro.FooBarSpecificRecord;
import org.apache.avro.TypeEnum;
import org.apache.avro.io.Decoder;
import org.apache.avro.io.DecoderFactory;
import org.apache.avro.io.Encoder;
import org.apache.avro.io.EncoderFactory;
import org.apache.avro.specific.SpecificDatumReader;
import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Collections;

import static org.junit.Assert.assertEquals;

/**
 * See AVRO-1810: GenericDatumWriter broken with Enum
 */
public class TestGenericConcreteEnum {

  private static byte[] serializeRecord(FooBarSpecificRecord fooBarSpecificRecord) throws IOException {
    GenericDatumWriter<FooBarSpecificRecord> datumWriter = new GenericDatumWriter<>(FooBarSpecificRecord.SCHEMA$);
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    Encoder encoder = EncoderFactory.get().binaryEncoder(byteArrayOutputStream, null);
    datumWriter.write(fooBarSpecificRecord, encoder);
    encoder.flush();
    return byteArrayOutputStream.toByteArray();
  }

  @Test
  public void testGenericWriteAndRead() throws IOException {
    FooBarSpecificRecord specificRecord = getRecord();

    byte[] bytes = serializeRecord(specificRecord);

    Decoder decoder = DecoderFactory.get().binaryDecoder(bytes, null);

    GenericDatumReader<IndexedRecord> genericDatumReader = new GenericDatumReader<>(FooBarSpecificRecord.SCHEMA$);
    IndexedRecord deserialized = new GenericData.Record(FooBarSpecificRecord.SCHEMA$);
    genericDatumReader.read(deserialized, decoder);

    assertEquals(0, GenericData.get().compare(specificRecord, deserialized, FooBarSpecificRecord.SCHEMA$));
  }

  @Test
  public void testGenericWriteSpecificRead() throws IOException {
    FooBarSpecificRecord specificRecord = getRecord();

    byte[] bytes = serializeRecord(specificRecord);

    Decoder decoder = DecoderFactory.get().binaryDecoder(bytes, null);

    SpecificDatumReader<FooBarSpecificRecord> specificDatumReader = new SpecificDatumReader<>(
        FooBarSpecificRecord.SCHEMA$);
    FooBarSpecificRecord deserialized = new FooBarSpecificRecord();
    specificDatumReader.read(deserialized, decoder);

    assertEquals(specificRecord, deserialized);
  }

  private FooBarSpecificRecord getRecord() {
    return FooBarSpecificRecord.newBuilder().setId(42).setName("foo").setNicknames(Collections.singletonList("bar"))
        .setRelatedids(Collections.singletonList(3)).setTypeEnum(TypeEnum.a).build();
  }
}