1 /* 2 * Copyright (C) 2007-2010 Jlio Vilmar Gesser. 3 * Copyright (C) 2011, 2013-2016 The JavaParser Team. 4 * 5 * This file is part of JavaParser. 6 * 7 * JavaParser can be used either under the terms of 8 * a) the GNU Lesser General Public License as published by 9 * the Free Software Foundation, either version 3 of the License, or 10 * (at your option) any later version. 11 * b) the terms of the Apache License 12 * 13 * You should have received a copy of both licenses in LICENCE.LGPL and 14 * LICENCE.APACHE. Please refer to those files for details. 15 * 16 * JavaParser is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU Lesser General Public License for more details. 20 */ 21 22 package com.github.javaparser; 23 24 import com.github.javaparser.ast.Node; 25 import com.github.javaparser.ast.observer.Observable; 26 27 import java.util.Optional; 28 29 /** 30 * An object that has a parent node. 31 */ 32 public interface HasParentNode<T> extends Observable { 33 34 /** 35 * Return the parent node or null, if no parent is set. 36 */ 37 Optional<Node> getParentNode(); 38 39 /** 40 * Set the parent node. 41 * 42 * @param parentNode the parent node or null, to set no parent 43 * @return return <i>this</i> 44 */ 45 T setParentNode(Node parentNode); 46 47 /** 48 * <i>this</i> for everything except NodeLists. NodeLists use their parent as their children parent. 49 */ 50 Node getParentNodeForChildren(); 51 52 /** 53 * Get the ancestor of the node having the given type, or null if no ancestor of the given type is found. 54 */ 55 default <N> Optional<N> getAncestorOfType(Class<N> classType) { 56 Node parent = getParentNode().orElse(null); 57 while (parent != null) { 58 if (classType.isAssignableFrom(parent.getClass())) { 59 return Optional.of(classType.cast(parent)); 60 } 61 parent = parent.getParentNode().orElse(null); 62 } 63 return Optional.empty(); 64 } 65 } 66
