| /* |
| * 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.ignite.internal.configuration.tree; |
| |
| import java.io.Serializable; |
| |
| /** |
| * Configuration visitor - callback interface to traverse configuration tree. |
| */ |
| public interface ConfigurationVisitor<T> { |
| /** |
| * Invoked on visiting leaf node. |
| * |
| * @param key Name of the serializable value retrieved from its holder object. |
| * @param val Configuration value. |
| * @return Anything that implementation decides to return. |
| */ |
| default T visitLeafNode(String key, Serializable val) { |
| return null; |
| } |
| |
| /** |
| * Invoked on visiting regular inner node. |
| * |
| * @param key Name of the node retrieved from its holder object. |
| * @param node Inner configuration node. |
| * @return Anything that implementation decides to return. |
| */ |
| default T visitInnerNode(String key, InnerNode node) { |
| return null; |
| } |
| |
| /** |
| * Invoked on visiting named list nodes. |
| * |
| * @param key Name of the node retrieved from its holder object. |
| * @param node Named list inner configuration node. |
| * @param <N> Type of element nodes in the named list. |
| * @return Anything that implementation decides to return. |
| */ |
| default <N extends InnerNode> T visitNamedListNode(String key, NamedListNode<N> node) { |
| return null; |
| } |
| } |