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.utils.Bytes;
  import org.apache.kafka.streams.KeyValue;
  import org.apache.kafka.streams.kstream.Windowed;
  import org.apache.kafka.streams.state.KeyValueIterator;
  
  import java.util.function.Function;
  
  class WrappedSessionStoreIterator implements KeyValueIterator<Windowed<Bytes>, byte[]> {
  
      private final KeyValueIterator<Bytes, byte[]> bytesIterator;
      private final Function<Bytes, Windowed<Bytes>> windowConstructor;
  
      WrappedSessionStoreIterator(final KeyValueIterator<Bytes, byte[]> bytesIterator) {
          this(bytesIterator, SessionKeySchema::from);
      }
  
      WrappedSessionStoreIterator(final KeyValueIterator<Bytes, byte[]> bytesIterator,
                                  final Function<Bytes, Windowed<Bytes>> windowConstructor) {
          this.bytesIterator = bytesIterator;
          this.windowConstructor = windowConstructor;
      }
  
      @Override
      public void close() {
          bytesIterator.close();
      }
  
      @Override
      public Windowed<Bytes> peekNextKey() {
          return windowConstructor.apply(bytesIterator.peekNextKey());
      }
  
      @Override
      public boolean hasNext() {
          return bytesIterator.hasNext();
      }
  
      @Override
      public KeyValue<Windowed<Bytes>, byte[]> next() {
          final KeyValue<Bytes, byte[]> next = bytesIterator.next();
          return KeyValue.pair(windowConstructor.apply(next.key), next.value);
      }
  }