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 example;
  
  import java.io.File;
  import java.io.IOException;
  
  import org.apache.avro.file.DataFileReader;
  import org.apache.avro.file.DataFileWriter;
  import org.apache.avro.io.DatumReader;
  import org.apache.avro.io.DatumWriter;
  import org.apache.avro.specific.SpecificDatumReader;
  import org.apache.avro.specific.SpecificDatumWriter;
  
  import example.avro.User;
  
  public class SpecificMain {
    public static void main(String[] args) throws IOException {
      User user1 = new User();
      user1.setName("Alyssa");
      user1.setFavoriteNumber(256);
      // Leave favorite color null
  
      // Alternate constructor
      User user2 = new User("Ben", 7, "red");
  
      // Construct via builder
      User user3 = User.newBuilder()
               .setName("Charlie")
               .setFavoriteColor("blue")
               .setFavoriteNumber(null)
               .build();
  
      // Serialize user1 and user2 to disk
      File file = new File("users.avro");
      DatumWriter<User> userDatumWriter = new SpecificDatumWriter<User>(User.class);
      DataFileWriter<User> dataFileWriter = new DataFileWriter<User>(userDatumWriter);
      dataFileWriter.create(user1.getSchema(), file);
      dataFileWriter.append(user1);
      dataFileWriter.append(user2);
      dataFileWriter.append(user3);
      dataFileWriter.close();
  
      // Deserialize Users from disk
      DatumReader<User> userDatumReader = new SpecificDatumReader<User>(User.class);
      User user = null;
      try(DataFileReader<User> dataFileReader = new DataFileReader<User>(file, userDatumReader)){
        while (dataFileReader.hasNext()) {
          // Reuse user object by passing it to next(). This saves us from
          // allocating and garbage collecting many objects for files with
          // many items.
          user = dataFileReader.next(user);
          System.out.println(user);
        }
      }
    }
  }
  