| /* |
| * 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.util; |
| |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.function.Supplier; |
| import org.apache.ignite.internal.configuration.tree.ConfigurationVisitor; |
| import org.apache.ignite.internal.configuration.tree.InnerNode; |
| import org.apache.ignite.internal.configuration.tree.NamedListNode; |
| |
| /** Visitor that accumulates keys while descending. */ |
| public abstract class KeysTrackingConfigurationVisitor<T> implements ConfigurationVisitor<T> { |
| /** Current key, aggregated by visitor. */ |
| private StringBuilder currentKey = new StringBuilder(); |
| |
| /** Current keys list, almost the same as {@link #currentKey}. */ |
| private List<String> currentPath = new ArrayList<>(); |
| |
| /** {@inheritDoc} */ |
| @Override public final T visitLeafNode(String key, Serializable val) { |
| int prevPos = startVisit(key, false, true); |
| |
| try { |
| return doVisitLeafNode(key, val); |
| } |
| finally { |
| endVisit(prevPos); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public final T visitInnerNode(String key, InnerNode node) { |
| int prevPos = startVisit(key, false, false); |
| |
| try { |
| return doVisitInnerNode(key, node); |
| } |
| finally { |
| endVisit(prevPos); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public final <N extends InnerNode> T visitNamedListNode(String key, NamedListNode<N> node) { |
| int prevPos = startVisit(key, false, false); |
| |
| try { |
| return doVisitNamedListNode(key, node); |
| } |
| finally { |
| endVisit(prevPos); |
| } |
| } |
| |
| /** |
| * To be used instead of {@link ConfigurationVisitor#visitLeafNode(String, Serializable)}. |
| * |
| * @param key Name of the node retrieved from its holder object. |
| * @param val Configuration value. |
| * @return Anything that implementation decides to return. |
| */ |
| protected T doVisitLeafNode(String key, Serializable val) { |
| return null; |
| } |
| |
| /** |
| * To be used instead of {@link ConfigurationVisitor#visitInnerNode(String, InnerNode)}. |
| * |
| * @param key Name of the node retrieved from its holder object. |
| * @param node Inner configuration node. |
| * @return Anything that implementation decides to return. |
| */ |
| protected T doVisitInnerNode(String key, InnerNode node) { |
| node.traverseChildren(this, true); |
| |
| return null; |
| } |
| |
| /** |
| * To be used instead of {@link ConfigurationVisitor#visitNamedListNode(String, NamedListNode)}. |
| * |
| * @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. |
| */ |
| protected <N extends InnerNode> T doVisitNamedListNode(String key, NamedListNode<N> node) { |
| for (String namedListKey : node.namedListKeys()) { |
| int prevPos = startVisit(namedListKey, true, false); |
| |
| try { |
| doVisitInnerNode(namedListKey, node.get(namedListKey)); |
| } |
| finally { |
| endVisit(prevPos); |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Tracks passed key to reflect it in {@link #currentKey()} and {@link #currentPath()}. |
| * |
| * @param key Key itself. |
| * @param escape Whether the key needs escaping or not. |
| * @param leaf Add dot at the end of {@link #currentKey()} if {@code leaf} is {@code false}. |
| * @param closure Closure to execute when {@link #currentKey()} and {@link #currentPath()} have updated values. |
| * @return Closure result. |
| */ |
| protected final T withTracking(String key, boolean escape, boolean leaf, Supplier<T> closure) { |
| int prevPos = startVisit(key, escape, leaf); |
| |
| try { |
| return closure.get(); |
| } |
| finally { |
| endVisit(prevPos); |
| } |
| } |
| |
| /** |
| * @return Current key, with a dot at the end if it's not a leaf. |
| */ |
| protected final String currentKey() { |
| return currentKey.toString(); |
| } |
| |
| /** |
| * @return List representation of the current key. |
| */ |
| protected final List<String> currentPath() { |
| return Collections.unmodifiableList(currentPath); |
| } |
| |
| /** |
| * Prepares values of {@link #currentKey} and {@link #currentPath} for further processing. |
| * |
| * @param key Key. |
| * @param escape Whether we need to escape the key before appending it to {@link #currentKey}. |
| * @return Previous length of {@link #currentKey} so it can be passed to {@link #endVisit(int)} later. |
| */ |
| private int startVisit(String key, boolean escape, boolean leaf) { |
| int previousKeyLength = currentKey.length(); |
| |
| currentKey.append(escape ? ConfigurationUtil.escape(key) : key); |
| |
| if (!leaf) |
| currentKey.append('.'); |
| |
| currentPath.add(key); |
| |
| return previousKeyLength; |
| } |
| |
| /** |
| * Puts {@link #currentKey} and {@link #currentPath} in the same state as they were before |
| * {@link #startVisit(String, boolean)}. |
| * |
| * @param previousKeyLength Value return by corresponding {@link #startVisit(String, boolean)} invocation. |
| */ |
| private void endVisit(int previousKeyLength) { |
| currentKey.setLength(previousKeyLength); |
| |
| currentPath.remove(currentPath.size() - 1); |
| } |
| } |