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This project contains a parser for the Checker Framework's stub files: https://checkerframework.org/manual/#stub . It is a fork of the JavaParser project.
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/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2024 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */
package com.github.javaparser.ast.expr;

import static com.github.javaparser.utils.Utils.assertNotNull;

import com.github.javaparser.TokenRange;
import com.github.javaparser.ast.AllFieldsConstructor;
import com.github.javaparser.ast.Generated;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.observer.ObservableProperty;
import com.github.javaparser.ast.visitor.CloneVisitor;
import com.github.javaparser.ast.visitor.GenericVisitor;
import com.github.javaparser.ast.visitor.VoidVisitor;
import com.github.javaparser.metamodel.ArrayAccessExprMetaModel;
import com.github.javaparser.metamodel.JavaParserMetaModel;
import java.util.Optional;
import java.util.function.Consumer;

/**
 * Array brackets [] being used to get a value from an array.
 * In 
{@code getNames()[15*15]} the name expression is getNames() and the index expression is 15*15.
 *
 * @author Julio Vilmar Gesser
 */
public class ArrayAccessExpr extends Expression {

    private Expression name;

    private Expression index;

    public ArrayAccessExpr() {
        this(null, new NameExpr(), new IntegerLiteralExpr());
    }

    @AllFieldsConstructor
    public ArrayAccessExpr(Expression name, Expression index) {
        this(null, name, index);
    }

    /**
     * This constructor is used by the parser and is considered private.
     */
    @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
    public ArrayAccessExpr(TokenRange tokenRange, Expression name, Expression index) {
        super(tokenRange);
        setName(name);
        setIndex(index);
        customInitialization();
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
    public  R accept(final GenericVisitor v, final A arg) {
        return v.visit(this, arg);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
    public  void accept(final VoidVisitor v, final A arg) {
        v.visit(this, arg);
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public Expression getIndex() {
        return index;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public Expression getName() {
        return name;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public ArrayAccessExpr setIndex(final Expression index) {
        assertNotNull(index);
        if (index == this.index) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.INDEX, this.index, index);
        if (this.index != null) this.index.setParentNode(null);
        this.index = index;
        setAsParentNodeOf(index);
        return this;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public ArrayAccessExpr setName(final Expression name) {
        assertNotNull(name);
        if (name == this.name) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.NAME, this.name, name);
        if (this.name != null) this.name.setParentNode(null);
        this.name = name;
        setAsParentNodeOf(name);
        return this;
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.CloneGenerator")
    public ArrayAccessExpr clone() {
        return (ArrayAccessExpr) accept(new CloneVisitor(), null);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")
    public ArrayAccessExprMetaModel getMetaModel() {
        return JavaParserMetaModel.arrayAccessExprMetaModel;
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")
    public boolean replace(Node node, Node replacementNode) {
        if (node == null) {
            return false;
        }
        if (node == index) {
            setIndex((Expression) replacementNode);
            return true;
        }
        if (node == name) {
            setName((Expression) replacementNode);
            return true;
        }
        return super.replace(node, replacementNode);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public boolean isArrayAccessExpr() {
        return true;
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public ArrayAccessExpr asArrayAccessExpr() {
        return this;
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public void ifArrayAccessExpr(Consumer action) {
        action.accept(this);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public Optional toArrayAccessExpr() {
        return Optional.of(this);
    }
}