| 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.ast.nodeTypes; |
| 23 | |
| 24 | import com.github.javaparser.ast.Node; |
| 25 | import com.github.javaparser.ast.NodeList; |
| 26 | import com.github.javaparser.ast.type.Type; |
| 27 | import com.github.javaparser.metamodel.DerivedProperty; |
| 28 | |
| 29 | import java.util.Optional; |
| 30 | |
| 31 | import static com.github.javaparser.ast.NodeList.nodeList; |
| 32 | |
| 33 | /** |
| 34 | * A node that can have type arguments. |
| 35 | * <p> |
| 36 | * <pre> |
| 37 | * new X(); --> typeArguments == Optional is empty |
| 38 | * new X<>(); --> typeArguments = [], diamondOperator = true |
| 39 | * new X<C,D>(); --> typeArguments = [C,D], diamondOperator = false |
| 40 | * </pre> |
| 41 | * Only ObjectCreationExpr uses the diamond operator. |
| 42 | * On other nodes it is treated the same as the first case. |
| 43 | */ |
| 44 | public interface NodeWithTypeArguments<N extends Node> { |
| 45 | /** |
| 46 | * @return the types that can be found in the type arguments: {@code <String, Integer>}. |
| 47 | */ |
| 48 | Optional<NodeList<Type>> getTypeArguments(); |
| 49 | |
| 50 | /** |
| 51 | * Allows you to set the generic arguments |
| 52 | * |
| 53 | * @param typeArguments The list of types of the generics, can be null |
| 54 | */ |
| 55 | N setTypeArguments(NodeList<Type> typeArguments); |
| 56 | |
| 57 | /** |
| 58 | * @return whether the type arguments look like {@code <>}. |
| 59 | */ |
| 60 | @DerivedProperty |
| 61 | default boolean isUsingDiamondOperator() { |
| 62 | return getTypeArguments().isPresent() && getTypeArguments().get().isEmpty(); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Sets the type arguments to {@code <>}. |
| 67 | */ |
| 68 | @SuppressWarnings("unchecked") |
| 69 | default N setDiamondOperator() { |
| 70 | return setTypeArguments(new NodeList<>()); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Removes all type arguments, including the surrounding {@code <>}. |
| 75 | */ |
| 76 | @SuppressWarnings("unchecked") |
| 77 | default N removeTypeArguments() { |
| 78 | return setTypeArguments((NodeList<Type>) null); |
| 79 | } |
| 80 | |
| 81 | @SuppressWarnings("unchecked") |
| 82 | default N setTypeArguments(Type... typeArguments) { |
| 83 | return setTypeArguments(nodeList(typeArguments)); |
| 84 | } |
| 85 | } |
| 86 |
Members