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.kstream.internals;
  
  import org.apache.kafka.common.serialization.Deserializer;
  import org.apache.kafka.common.serialization.Serde;
  import org.apache.kafka.common.serialization.Serializer;
  
  import java.nio.ByteBuffer;
  
  import static java.util.Objects.requireNonNull;
  import static org.apache.kafka.common.utils.Utils.getNullableSizePrefixedArray;
  
  public final class FullChangeSerde<T> {
      private final Serde<T> inner;
  
      public static <T> FullChangeSerde<T> wrap(final Serde<T> serde) {
          if (serde == null) {
              return null;
          } else {
              return new FullChangeSerde<>(serde);
          }
      }
  
      private FullChangeSerde(final Serde<T> inner) {
          this.inner = requireNonNull(inner);
      }
  
      public Serde<T> innerSerde() {
          return inner;
      }
  
      public Change<byte[]> serializeParts(final String topic, final Change<T> data) {
          if (data == null) {
              return null;
          }
          final Serializer<T> innerSerializer = innerSerde().serializer();
          final byte[] oldBytes = data.oldValue == null ? null : innerSerializer.serialize(topic, data.oldValue);
          final byte[] newBytes = data.newValue == null ? null : innerSerializer.serialize(topic, data.newValue);
          return new Change<>(newBytes, oldBytes);
      }
  
  
      public Change<T> deserializeParts(final String topic, final Change<byte[]> serialChange) {
          if (serialChange == null) {
              return null;
          }
          final Deserializer<T> innerDeserializer = innerSerde().deserializer();
  
          final T oldValue =
              serialChange.oldValue == null ? null : innerDeserializer.deserialize(topic, serialChange.oldValue);
          final T newValue =
              serialChange.newValue == null ? null : innerDeserializer.deserialize(topic, serialChange.newValue);
  
          return new Change<>(newValue, oldValue);
      }
  
      /**
       * We used to serialize a Change into a single byte[]. Now, we don't anymore, but we still
       * need to be able to read it (so that we can load the state store from previously-written changelog records).
       */
      public static Change<byte[]> decomposeLegacyFormattedArrayIntoChangeArrays(final byte[] data) {
          if (data == null) {
              return null;
          }
          final ByteBuffer buffer = ByteBuffer.wrap(data);
          final byte[] oldBytes = getNullableSizePrefixedArray(buffer);
          final byte[] newBytes = getNullableSizePrefixedArray(buffer);
          return new Change<>(newBytes, oldBytes);
      }
  
  }
  