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      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 package com.github.javaparser.ast.expr;
     22 
     23 import com.github.javaparser.ast.AllFieldsConstructor;
     24 import com.github.javaparser.ast.visitor.GenericVisitor;
     25 import com.github.javaparser.ast.visitor.VoidVisitor;
     26 import com.github.javaparser.ast.Node;
     27 import com.github.javaparser.ast.visitor.CloneVisitor;
     28 import com.github.javaparser.metamodel.NullLiteralExprMetaModel;
     29 import com.github.javaparser.metamodel.JavaParserMetaModel;
     30 import javax.annotation.Generated;
     31 import com.github.javaparser.TokenRange;
     32 import java.util.function.Consumer;
     33 import java.util.Optional;
     34 
     35 /**
     36  * A literal "null".
     37  * <br/><code>null</code>
     38  *
     39  * @author Julio Vilmar Gesser
     40  */
     41 public final class NullLiteralExpr extends LiteralExpr {
     42 
     43     @AllFieldsConstructor
     44     public NullLiteralExpr() {
     45         this(null);
     46     }
     47 
     48     /**
     49      * This constructor is used by the parser and is considered private.
     50      */
     51     @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
     52     public NullLiteralExpr(TokenRange tokenRange) {
     53         super(tokenRange);
     54         customInitialization();
     55     }
     56 
     57     @Override
     58     @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
     59     public <R, A> R accept(final GenericVisitor<R, A> v, final A arg) {
     60         return v.visit(this, arg);
     61     }
     62 
     63     @Override
     64     @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
     65     public <A> void accept(final VoidVisitor<A> v, final A arg) {
     66         v.visit(this, arg);
     67     }
     68 
     69     @Override
     70     @Generated("com.github.javaparser.generator.core.node.RemoveMethodGenerator")
     71     public boolean remove(Node node) {
     72         if (node == null)
     73             return false;
     74         return super.remove(node);
     75     }
     76 
     77     @Override
     78     @Generated("com.github.javaparser.generator.core.node.CloneGenerator")
     79     public NullLiteralExpr clone() {
     80         return (NullLiteralExpr) accept(new CloneVisitor(), null);
     81     }
     82 
     83     @Override
     84     @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")
     85     public NullLiteralExprMetaModel getMetaModel() {
     86         return JavaParserMetaModel.nullLiteralExprMetaModel;
     87     }
     88 
     89     @Override
     90     @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")
     91     public boolean replace(Node node, Node replacementNode) {
     92         if (node == null)
     93             return false;
     94         return super.replace(node, replacementNode);
     95     }
     96 
     97     @Override
     98     @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
     99     public boolean isNullLiteralExpr() {
    100         return true;
    101     }
    102 
    103     @Override
    104     @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    105     public NullLiteralExpr asNullLiteralExpr() {
    106         return this;
    107     }
    108 
    109     @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    110     public void ifNullLiteralExpr(Consumer<NullLiteralExpr> action) {
    111         action.accept(this);
    112     }
    113 
    114     @Override
    115     @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    116     public Optional<NullLiteralExpr> toNullLiteralExpr() {
    117         return Optional.of(this);
    118     }
    119 }
    120