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 org.apache.kafka.common.utils.Bytes;
  import org.apache.kafka.common.utils.Utils;
  import org.apache.kafka.streams.kstream.internals.Change;
  import org.apache.kafka.streams.kstream.internals.FullChangeSerde;
  import org.apache.kafka.streams.processor.internals.ProcessorRecordContext;
  
  import java.nio.ByteBuffer;
  
  import static java.util.Objects.requireNonNull;
  
  final class TimeOrderedKeyValueBufferChangelogDeserializationHelper {
      private TimeOrderedKeyValueBufferChangelogDeserializationHelper() {}
  
      static final class DeserializationResult {
          private final long time;
          private final Bytes key;
          private final BufferValue bufferValue;
  
          private DeserializationResult(final long time, final Bytes key, final BufferValue bufferValue) {
              this.time = time;
              this.key = key;
              this.bufferValue = bufferValue;
          }
  
          long time() {
              return time;
          }
  
          Bytes key() {
              return key;
          }
  
          BufferValue bufferValue() {
              return bufferValue;
          }
      }
  
      static DeserializationResult deserializeV0(final ConsumerRecord<byte[], byte[]> record,
                                                 final Bytes key,
                                                 final byte[] previousBufferedValue) {
  
          final ByteBuffer timeAndValue = ByteBuffer.wrap(record.value());
          final long time = timeAndValue.getLong();
          final byte[] changelogValue = new byte[record.value().length - 8];
          timeAndValue.get(changelogValue);
  
          final Change<byte[]> change = requireNonNull(FullChangeSerde.decomposeLegacyFormattedArrayIntoChangeArrays(changelogValue));
  
          final ProcessorRecordContext recordContext = new ProcessorRecordContext(
              record.timestamp(),
              record.offset(),
              record.partition(),
              record.topic(),
              record.headers()
          );
  
          return new DeserializationResult(
              time,
              key,
              new BufferValue(
                  previousBufferedValue == null ? change.oldValue : previousBufferedValue,
                  change.oldValue,
                  change.newValue,
                  recordContext
              )
          );
      }
  
      static DeserializationResult deserializeV1(final ConsumerRecord<byte[], byte[]> record,
                                                 final Bytes key,
                                                 final byte[] previousBufferedValue) {
          final ByteBuffer timeAndValue = ByteBuffer.wrap(record.value());
          final long time = timeAndValue.getLong();
          final byte[] changelogValue = new byte[record.value().length - 8];
          timeAndValue.get(changelogValue);
  
          final ContextualRecord contextualRecord = ContextualRecord.deserialize(ByteBuffer.wrap(changelogValue));
          final Change<byte[]> change = requireNonNull(FullChangeSerde.decomposeLegacyFormattedArrayIntoChangeArrays(contextualRecord.value()));
  
          return new DeserializationResult(
              time,
              key,
              new BufferValue(
                  previousBufferedValue == null ? change.oldValue : previousBufferedValue,
                  change.oldValue,
                  change.newValue,
                  contextualRecord.recordContext()
              )
          );
      }
  
      static DeserializationResult duckTypeV2(final ConsumerRecord<byte[], byte[]> record, final Bytes key) {
          DeserializationResult deserializationResult = null;
          RuntimeException v2DeserializationException = null;
          RuntimeException v3DeserializationException = null;
          try {
              deserializationResult = deserializeV2(record, key);
          } catch (final RuntimeException e) {
              v2DeserializationException = e;
          }
          // versions 2.4.0, 2.4.1, and 2.5.0 would have erroneously encoded a V3 record with the
          // V2 header, so we'll try duck-typing to see if this is decodable as V3
          if (deserializationResult == null) {
              try {
                  deserializationResult = deserializeV3(record, key);
              } catch (final RuntimeException e) {
                  v3DeserializationException = e;
              }
          }
  
          if (deserializationResult == null) {
              // ok, it wasn't V3 either. Throw both exceptions:
              final RuntimeException exception =
                  new RuntimeException("Couldn't deserialize record as v2 or v3: " + record,
                                       v2DeserializationException);
              exception.addSuppressed(v3DeserializationException);
              throw exception;
          }
          return deserializationResult;
      }
  
      private static DeserializationResult deserializeV2(final ConsumerRecord<byte[], byte[]> record,
                                                         final Bytes key) {
          final ByteBuffer valueAndTime = ByteBuffer.wrap(record.value());
          final ContextualRecord contextualRecord = ContextualRecord.deserialize(valueAndTime);
          final Change<byte[]> change = requireNonNull(FullChangeSerde.decomposeLegacyFormattedArrayIntoChangeArrays(contextualRecord.value()));
          final byte[] priorValue = Utils.getNullableSizePrefixedArray(valueAndTime);
          final long time = valueAndTime.getLong();
          final BufferValue bufferValue = new BufferValue(priorValue, change.oldValue, change.newValue, contextualRecord.recordContext());
          return new DeserializationResult(time, key, bufferValue);
      }
  
      static DeserializationResult deserializeV3(final ConsumerRecord<byte[], byte[]> record, final Bytes key) {
          final ByteBuffer valueAndTime = ByteBuffer.wrap(record.value());
          final BufferValue bufferValue = BufferValue.deserialize(valueAndTime);
          final long time = valueAndTime.getLong();
          return new DeserializationResult(time, key, bufferValue);
      }
  }