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.streams.KeyValue;
  import org.apache.kafka.streams.state.KeyValueIterator;
  import org.apache.kafka.streams.state.ValueAndTimestamp;
  
  import static org.apache.kafka.streams.state.ValueAndTimestamp.getValueOrNull;
  
  public class KeyValueIteratorFacade<K, V> implements KeyValueIterator<K, V> {
      private final KeyValueIterator<K, ValueAndTimestamp<V>> innerIterator;
  
      public KeyValueIteratorFacade(final KeyValueIterator<K, ValueAndTimestamp<V>> iterator) {
          innerIterator = iterator;
      }
  
      @Override
      public boolean hasNext() {
          return innerIterator.hasNext();
      }
  
      @Override
      public K peekNextKey() {
          return innerIterator.peekNextKey();
      }
  
      @Override
      public KeyValue<K, V> next() {
          final KeyValue<K, ValueAndTimestamp<V>> innerKeyValue = innerIterator.next();
          return KeyValue.pair(innerKeyValue.key, getValueOrNull(innerKeyValue.value));
      }
  
      @Override
      public void close() {
          innerIterator.close();
      }
  }