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.Deserializer;
  import org.apache.kafka.common.serialization.LongDeserializer;
  import org.apache.kafka.streams.kstream.internals.WrappingNullableDeserializer;
  import org.apache.kafka.streams.processor.internals.SerdeGetter;
  import org.apache.kafka.streams.state.ValueAndTimestamp;
  
  import java.nio.ByteBuffer;
  import java.util.Map;
  import java.util.Objects;
  
  import static org.apache.kafka.streams.kstream.internals.WrappingNullableUtils.initNullableDeserializer;
  
  class ValueAndTimestampDeserializer<V> implements WrappingNullableDeserializer<ValueAndTimestamp<V>, Void, V> {
      private static final LongDeserializer LONG_DESERIALIZER = new LongDeserializer();
  
      public final Deserializer<V> valueDeserializer;
      private final Deserializer<Long> timestampDeserializer;
  
      ValueAndTimestampDeserializer(final Deserializer<V> valueDeserializer) {
          Objects.requireNonNull(valueDeserializer);
          this.valueDeserializer = valueDeserializer;
          timestampDeserializer = new LongDeserializer();
      }
  
      @Override
      public void configure(final Map<String, ?> configs,
                            final boolean isKey) {
          valueDeserializer.configure(configs, isKey);
          timestampDeserializer.configure(configs, isKey);
      }
  
      @Override
      public ValueAndTimestamp<V> deserialize(final String topic,
                                              final byte[] valueAndTimestamp) {
          if (valueAndTimestamp == null) {
              return null;
          }
  
          final long timestamp = timestampDeserializer.deserialize(topic, rawTimestamp(valueAndTimestamp));
          final V value = valueDeserializer.deserialize(topic, rawValue(valueAndTimestamp));
          return ValueAndTimestamp.make(value, timestamp);
      }
  
      @Override
      public void close() {
          valueDeserializer.close();
          timestampDeserializer.close();
      }
  
      static byte[] rawValue(final byte[] rawValueAndTimestamp) {
          if (rawValueAndTimestamp == null) {
              return null;
          }
  
          final int rawValueLength = rawValueAndTimestamp.length - 8;
          return ByteBuffer
              .allocate(rawValueLength)
              .put(rawValueAndTimestamp, 8, rawValueLength)
              .array();
      }
  
      private static byte[] rawTimestamp(final byte[] rawValueAndTimestamp) {
          return ByteBuffer
              .allocate(8)
              .put(rawValueAndTimestamp, 0, 8)
              .array();
      }
  
      static long timestamp(final byte[] rawValueAndTimestamp) {
          return LONG_DESERIALIZER.deserialize(null, rawTimestamp(rawValueAndTimestamp));
      }
  
      @Override
      public void setIfUnset(final SerdeGetter getter) {
          // ValueAndTimestampDeserializer never wraps a null deserializer (or configure would throw),
          // but it may wrap a deserializer that itself wraps a null deserializer.
          initNullableDeserializer(valueDeserializer, getter);
      }
  }
  