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.serialization.Serializer;
  import org.apache.kafka.streams.state.KeyValueIterator;
  import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
  import org.apache.kafka.streams.state.TimestampedKeyValueStore;
  
  import static org.apache.kafka.streams.state.ValueAndTimestamp.getValueOrNull;
  
  public class ReadOnlyKeyValueStoreFacade<K, V> implements ReadOnlyKeyValueStore<K, V> {
      protected final TimestampedKeyValueStore<K, V> inner;
  
      protected ReadOnlyKeyValueStoreFacade(final TimestampedKeyValueStore<K, V> store) {
          inner = store;
      }
  
      @Override
      public V get(final K key) {
          return getValueOrNull(inner.get(key));
      }
  
      @Override
      public KeyValueIterator<K, V> range(final K from,
                                          final K to) {
          return new KeyValueIteratorFacade<>(inner.range(from, to));
      }
  
      @Override
      public KeyValueIterator<K, V> reverseRange(final K from,
                                                 final K to) {
          return new KeyValueIteratorFacade<>(inner.reverseRange(from, to));
      }
  
      @Override
      public <PS extends Serializer<P>, P> KeyValueIterator<K, V> prefixScan(final P prefix,
                                                                             final PS prefixKeySerializer) {
          return new KeyValueIteratorFacade<>(inner.prefixScan(prefix, prefixKeySerializer));
      }
  
      @Override
      public KeyValueIterator<K, V> all() {
          return new KeyValueIteratorFacade<>(inner.all());
      }
  
      @Override
      public KeyValueIterator<K, V> reverseAll() {
          return new KeyValueIteratorFacade<>(inner.reverseAll());
      }
  
      @Override
      public long approximateNumEntries() {
          return inner.approximateNumEntries();
      }
  }