Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.tang.util.walk;
020
021
022/**
023 * Generic interface to traverse nodes of the configuration graph.
024 * It is used e.g. in Walk.preorder()
025 */
026public interface NodeVisitor<T> {
027
028  /**
029   * Process current configuration node.
030   *
031   * @param node Current configuration node.
032   * @return true to proceed with the next node, false to cancel.
033   */
034  boolean visit(T node);
035}