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
   *
   *     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.beam.it.gcp.artifacts.utils;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import org.apache.avro.Schema;
  import org.apache.avro.file.DataFileReader;
  import org.apache.avro.file.DataFileWriter;
  import org.apache.avro.file.SeekableByteArrayInput;
  import org.apache.avro.generic.GenericDatumReader;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.generic.GenericRecord;
  
  /**
   * The {@link AvroTestUtil} class provides common utilities used for executing tests that involve
   * Avro.
   */
  public class AvroTestUtil {
  
    /**
     * Create Avro file for the given schema and records list.
     *
     * @param schema Schema to use.
     * @param records Records to write on the sink.
     * @return Byte array that represents the content.
     */
    public static byte[] createAvroFile(Schema schema, List<GenericRecord> records)
        throws IOException {
      GenericDatumWriter<GenericRecord> writer = new GenericDatumWriter<>(schema);
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      DataFileWriter<GenericRecord> fileWriter = new DataFileWriter<>(writer).create(schema, baos);
      for (GenericRecord record : records) {
        fileWriter.append(record);
      }
      fileWriter.close();
  
      return baos.toByteArray();
    }
  
    /**
     * Read Avro records to a list of {@link GenericRecord}.
     *
     * @param schema Schema to use for reading.
     * @param contents Byte array with contents to read.
     * @return A list with all records.
     */
    public static List<GenericRecord> readRecords(Schema schema, byte[] contents) throws IOException {
      List<GenericRecord> records = new ArrayList<>();
  
      GenericDatumReader<GenericRecord> datum = new GenericDatumReader<>(schema);
      DataFileReader<GenericRecord> reader =
          new DataFileReader<>(new SeekableByteArrayInput(contents), datum);
  
      while (reader.hasNext()) {
        records.add(reader.next());
      }
  
      return records;
    }
  }
  