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.kafka.streams.state.internals;
  
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  
  import java.nio.ByteBuffer;
  
  public final class RecordConverters {
      private static final RecordConverter IDENTITY_INSTANCE = record -> record;
  
      private static final RecordConverter RAW_TO_TIMESTAMED_INSTANCE = record -> {
          final byte[] rawValue = record.value();
          final long timestamp = record.timestamp();
          final byte[] recordValue = rawValue == null ? null :
              ByteBuffer.allocate(8 + rawValue.length)
                  .putLong(timestamp)
                  .put(rawValue)
                  .array();
          return new ConsumerRecord<>(
              record.topic(),
              record.partition(),
              record.offset(),
              timestamp,
              record.timestampType(),
              record.serializedKeySize(),
              record.serializedValueSize(),
              record.key(),
              recordValue,
              record.headers(),
              record.leaderEpoch()
          );
      };
  
      // privatize the constructor so the class cannot be instantiated (only used for its static members)
      private RecordConverters() {}
  
      public static RecordConverter rawValueToTimestampedValue() {
          return RAW_TO_TIMESTAMED_INSTANCE;
      }
  
      public static RecordConverter identity() {
          return IDENTITY_INSTANCE;
      }
  }
  