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.common.serialization.LongSerializer;
  import org.apache.kafka.common.serialization.Serializer;
  import org.apache.kafka.streams.kstream.internals.WrappingNullableSerializer;
  import org.apache.kafka.streams.processor.internals.SerdeGetter;
  
  import java.nio.ByteBuffer;
  import java.util.Map;
  
  import static org.apache.kafka.streams.kstream.internals.WrappingNullableUtils.initNullableSerializer;
  
  /**
   * The serializer that is used for {@link TimestampedKeyAndJoinSide}, which is a combo key format of <timestamp, left/right flag, raw-key>
   * @param <K> the raw key type
   */
  public class TimestampedKeyAndJoinSideSerializer<K> implements WrappingNullableSerializer<TimestampedKeyAndJoinSide<K>, K, Void> {
      private Serializer<K> keySerializer;
      private final Serializer<Long> timestampSerializer = new LongSerializer();
  
      TimestampedKeyAndJoinSideSerializer(final Serializer<K> keySerializer) {
          this.keySerializer = keySerializer;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public void setIfUnset(final SerdeGetter getter) {
          if (keySerializer == null) {
              keySerializer = (Serializer<K>) getter.keySerde().serializer();
          }
  
          initNullableSerializer(keySerializer, getter);
      }
  
      @Override
      public void configure(final Map<String, ?> configs, final boolean isKey) {
          keySerializer.configure(configs, isKey);
      }
  
      @Override
      public byte[] serialize(final String topic, final TimestampedKeyAndJoinSide<K> data) {
          final byte boolByte = (byte) (data.isLeftSide() ? 1 : 0);
          final byte[] keyBytes = keySerializer.serialize(topic, data.key());
          final byte[] timestampBytes = timestampSerializer.serialize(topic, data.timestamp());
  
          return ByteBuffer
              .allocate(timestampBytes.length + 1 + keyBytes.length)
              .put(timestampBytes)
              .put(boolByte)
              .put(keyBytes)
              .array();
      }
  
      @Override
      public void close() {
          keySerializer.close();
      }
  }
  