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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;

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

import com.github.javaparser.TokenRange;
import com.github.javaparser.ast.expr.AnnotationExpr;
import com.github.javaparser.ast.expr.Name;
import com.github.javaparser.ast.nodeTypes.NodeWithAnnotations;
import com.github.javaparser.ast.nodeTypes.NodeWithName;
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.JavaParserMetaModel;
import com.github.javaparser.metamodel.PackageDeclarationMetaModel;

/**
 * A package declaration.
 * 
{@code package com.github.javaparser.ast;}
 * 
{@code @Wonderful package anything.can.be.annotated.nowadays;}
 *
 * @author Julio Vilmar Gesser
 */
public class PackageDeclaration extends Node
        implements NodeWithAnnotations, NodeWithName {

    private NodeList annotations = new NodeList<>();

    private Name name;

    public PackageDeclaration() {
        this(null, new NodeList<>(), new Name());
    }

    public PackageDeclaration(Name name) {
        this(null, new NodeList<>(), name);
    }

    @AllFieldsConstructor
    public PackageDeclaration(NodeList annotations, Name name) {
        this(null, annotations, name);
    }

    /**
     * This constructor is used by the parser and is considered private.
     */
    @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
    public PackageDeclaration(TokenRange tokenRange, NodeList annotations, Name name) {
        super(tokenRange);
        setAnnotations(annotations);
        setName(name);
        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);
    }

    /**
     * Retrieves the list of annotations declared before the package
     * declaration. Return {@code null} if there are no annotations.
     *
     * @return list of annotations or {@code null}
     */
    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public NodeList getAnnotations() {
        return annotations;
    }

    /**
     * Return the name expression of the package.
     *
     * @return the name of the package
     */
    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public Name getName() {
        return name;
    }

    /**
     * @param annotations the annotations to set
     */
    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public PackageDeclaration setAnnotations(final NodeList annotations) {
        assertNotNull(annotations);
        if (annotations == this.annotations) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.ANNOTATIONS, this.annotations, annotations);
        if (this.annotations != null) this.annotations.setParentNode(null);
        this.annotations = annotations;
        setAsParentNodeOf(annotations);
        return this;
    }

    /**
     * Sets the name of this package declaration.
     *
     * @param name the name to set
     */
    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public PackageDeclaration setName(final Name 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.RemoveMethodGenerator")
    public boolean remove(Node node) {
        if (node == null) {
            return false;
        }
        for (int i = 0; i < annotations.size(); i++) {
            if (annotations.get(i) == node) {
                annotations.remove(i);
                return true;
            }
        }
        return super.remove(node);
    }

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

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

    @Override
    @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")
    public boolean replace(Node node, Node replacementNode) {
        if (node == null) {
            return false;
        }
        for (int i = 0; i < annotations.size(); i++) {
            if (annotations.get(i) == node) {
                annotations.set(i, (AnnotationExpr) replacementNode);
                return true;
            }
        }
        if (node == name) {
            setName((Name) replacementNode);
            return true;
        }
        return super.replace(node, replacementNode);
    }
}