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.processor.internals;
  
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  import org.apache.kafka.streams.KeyValue;
  import org.apache.kafka.streams.processor.BatchingStateRestoreCallback;
  import org.apache.kafka.streams.processor.StateRestoreCallback;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  public final class StateRestoreCallbackAdapter {
      private StateRestoreCallbackAdapter() {}
  
      public static RecordBatchingStateRestoreCallback adapt(final StateRestoreCallback restoreCallback) {
          Objects.requireNonNull(restoreCallback, "stateRestoreCallback must not be null");
          if (restoreCallback instanceof RecordBatchingStateRestoreCallback) {
              return (RecordBatchingStateRestoreCallback) restoreCallback;
          } else if (restoreCallback instanceof BatchingStateRestoreCallback) {
              return records -> {
                  final List<KeyValue<byte[], byte[]>> keyValues = new ArrayList<>();
                  for (final ConsumerRecord<byte[], byte[]> record : records) {
                      keyValues.add(new KeyValue<>(record.key(), record.value()));
                  }
                  ((BatchingStateRestoreCallback) restoreCallback).restoreAll(keyValues);
              };
          } else {
              return records -> {
                  for (final ConsumerRecord<byte[], byte[]> record : records) {
                      restoreCallback.restore(record.key(), record.value());
                  }
              };
          }
      }
  }