| /* |
| * 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; |
| } |
| } |
| } |