001/*
002 * Copyright (C) 2009-2011 Mathias Doenitz
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.parboiled.trees;
018
019import java.util.List;
020
021/**
022 * A node in a directed graph (that may have cycles).
023 * The children list must not contain null entries.
024 *
025 * @param <T> the actual implementation type of this graph node
026 */
027public interface GraphNode<T extends GraphNode<T>> {
028
029    /**
030     * Returns the sub nodes of this node.
031     *
032     * @return the sub nodes
033     */
034    List<T> getChildren();
035
036}