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.Schema;
  import org.apache.avro.Schema.Parser;
  import org.apache.avro.file.DataFileReader;
  import org.apache.avro.file.DataFileWriter;
  import org.apache.avro.generic.GenericData;
  import org.apache.avro.generic.GenericDatumReader;
  import org.apache.avro.generic.GenericDatumWriter;
  import org.apache.avro.generic.GenericRecord;
  import org.apache.avro.io.DatumReader;
  import org.apache.avro.io.DatumWriter;
  
  public class GenericMain {
    public static void main(String[] args) throws IOException {
      Schema schema = new Parser().parse(new File("./../user.avsc"));
  
      GenericRecord user1 = new GenericData.Record(schema);
      user1.put("name", "Alyssa");
      user1.put("favorite_number", 256);
      // Leave favorite color null
  
      GenericRecord user2 = new GenericData.Record(schema);
      user2.put("name", "Ben");
      user2.put("favorite_number", 7);
      user2.put("favorite_color", "red");
  
      // Serialize user1 and user2 to disk
      File file = new File("users.avro");
      DatumWriter<GenericRecord> datumWriter = new GenericDatumWriter<GenericRecord>(schema);
      DataFileWriter<GenericRecord> dataFileWriter = new DataFileWriter<GenericRecord>(datumWriter);
      dataFileWriter.create(schema, file);
      dataFileWriter.append(user1);
      dataFileWriter.append(user2);
      dataFileWriter.close();
  
      // Deserialize users from disk
      DatumReader<GenericRecord> datumReader = new GenericDatumReader<GenericRecord>(schema);
      GenericRecord user = null;
      try(DataFileReader<GenericRecord> dataFileReader = new DataFileReader<GenericRecord>(file, datumReader)){
        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);
        }
      }
  
  
    }
  }
  