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
019/**
020 * A {@link TreeNode} specialization with only two child nodes, left and right.
021 *
022 * @param <T> the actual implementation type of this tree node
023 */
024public interface BinaryTreeNode<T extends BinaryTreeNode<T>> extends TreeNode<T> {
025
026    /**
027     * Returns the left sub node.
028     *
029     * @return the left sub node
030     */
031    T left();
032
033    /**
034     * Returns the right sub node.
035     *
036     * @return the right sub node
037     */
038    T right();
039
040}