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.cassandra.db.tries;
  
  import java.util.function.BiConsumer;
  
  import org.apache.cassandra.utils.bytecomparable.ByteComparable;
  
  /**
   * Walker of trie entries, used with Trie.process to walk all content in order and provide the path through which values
   * are reached.
   */
  public abstract class TrieEntriesWalker<T, V> extends TriePathReconstructor implements Trie.Walker<T, V>
  {
      @Override
      public void content(T content)
      {
          content(content, keyBytes, keyPos);
      }
  
      protected abstract void content(T content, byte[] bytes, int byteLength);
  
      /**
       * Iterator representing the content of the trie a sequence of (path, content) pairs.
       */
      static class WithConsumer<T> extends TrieEntriesWalker<T, Void>
      {
          private final BiConsumer<ByteComparable, T> consumer;
  
          public WithConsumer(BiConsumer<ByteComparable, T> consumer)
          {
              this.consumer = consumer;
          }
  
          @Override
          protected void content(T content, byte[] bytes, int byteLength)
          {
              consumer.accept(toByteComparable(bytes, byteLength), content);
          }
  
          @Override
          public Void complete()
          {
              return null;
          }
      }
  }
  