| 1 | /* |
|---|---|
| 2 | * Copyright (C) 2007-2010 Júlio Vilmar Gesser. |
| 3 | * Copyright (C) 2011, 2013-2020 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.printer.lexicalpreservation.changes; |
| 23 | |
| 24 | import com.github.javaparser.ast.Node; |
| 25 | import com.github.javaparser.ast.NodeList; |
| 26 | import com.github.javaparser.ast.observer.ObservableProperty; |
| 27 | |
| 28 | import java.util.Optional; |
| 29 | |
| 30 | /** |
| 31 | * The removal of an element from a list. |
| 32 | */ |
| 33 | public class ListRemovalChange implements Change { |
| 34 | |
| 35 | private final ObservableProperty observableProperty; |
| 36 | private final int index; |
| 37 | |
| 38 | public ListRemovalChange(ObservableProperty observableProperty, int index) { |
| 39 | this.observableProperty = observableProperty; |
| 40 | this.index = index; |
| 41 | } |
| 42 | |
| 43 | @Override |
| 44 | public Object getValue(ObservableProperty property, Node node) { |
| 45 | if (property == observableProperty) { |
| 46 | Object currentRawValue = new NoChange().getValue(property, node); |
| 47 | if (currentRawValue instanceof Optional) { |
| 48 | Optional<?> optional = (Optional<?>) currentRawValue; |
| 49 | currentRawValue = optional.orElseGet(null); |
| 50 | } |
| 51 | if (!(currentRawValue instanceof NodeList)) { |
| 52 | throw new IllegalStateException("Expected NodeList, found " + currentRawValue.getClass().getCanonicalName()); |
| 53 | } |
| 54 | NodeList<Node> currentNodeList = (NodeList<Node>) currentRawValue; |
| 55 | |
| 56 | // Note: When adding to a node list children get assigned the list's parent, thus we must set the list's parent before adding children (#2592). |
| 57 | NodeList<Node> newNodeList = new NodeList<>(); |
| 58 | newNodeList.setParentNode(currentNodeList.getParentNodeForChildren()); // fix #2187 set the parent node in the new list |
| 59 | newNodeList.addAll(currentNodeList); |
| 60 | |
| 61 | // Perform modification -- remove an item from the list |
| 62 | newNodeList.remove(index); |
| 63 | |
| 64 | return newNodeList; |
| 65 | } else { |
| 66 | return new NoChange().getValue(property, node); |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 |
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