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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.comments;

import static com.github.javaparser.utils.CodeGenerationUtils.f;
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.metamodel.CommentMetaModel;
import com.github.javaparser.metamodel.InternalProperty;
import com.github.javaparser.metamodel.JavaParserMetaModel;
import java.util.Optional;
import java.util.function.Consumer;

/**
 * Abstract class for all AST nodes that represent comments.
 *
 * @author Julio Vilmar Gesser
 * @see BlockComment
 * @see LineComment
 * @see JavadocComment
 */
public abstract class Comment extends Node {

    private String content;

    @InternalProperty
    private Node commentedNode;

    @AllFieldsConstructor
    public Comment(String content) {
        this(null, content);
    }

    /**
     * This constructor is used by the parser and is considered private.
     */
    @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
    public Comment(TokenRange tokenRange, String content) {
        super(tokenRange);
        setContent(content);
        customInitialization();
    }

    /**
     * Return the text of the comment.
     *
     * @return text of the comment
     */
    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public String getContent() {
        return content;
    }

    /**
     * Sets the text of the comment.
     *
     * @param content the text of the comment to set
     */
    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public Comment setContent(final String content) {
        assertNotNull(content);
        if (content == this.content) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.CONTENT, this.content, content);
        this.content = content;
        return this;
    }

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public boolean isLineComment() {
        return false;
    }

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public LineComment asLineComment() {
        throw new IllegalStateException(
                f("%s is not LineComment, it is %s", this, this.getClass().getSimpleName()));
    }

    public Optional getCommentedNode() {
        return Optional.ofNullable(this.commentedNode);
    }

    /**
     * Sets the commentedNode
     *
     * @param commentedNode the commentedNode, can be null
     * @return this, the Comment
     */
    public Comment setCommentedNode(Node commentedNode) {
        notifyPropertyChange(ObservableProperty.COMMENTED_NODE, this.commentedNode, commentedNode);
        if (commentedNode == null) {
            this.commentedNode = null;
            return this;
        }
        if (commentedNode == this) {
            throw new IllegalArgumentException();
        }
        if (commentedNode instanceof Comment) {
            throw new IllegalArgumentException();
        }
        this.commentedNode = commentedNode;
        return this;
    }

    public boolean isOrphan() {
        return this.commentedNode == null;
    }

    @Override
    public Node setComment(final Comment comment) {
        // comments on comments are not allowed, so we override setComment(Comment) here
        if (comment != null) {
            throw new IllegalArgumentException("A comment cannot be commented.");
        }
        return super.setComment(comment);
    }

    @Override
    public boolean remove() {
        if (this.commentedNode != null) {
            this.commentedNode.setComment(null);
            return true;
        }
        if (this.getParentNode().isPresent()) {
            return this.getParentNode().get().removeOrphanComment(this);
        }
        return false;
    }

    @Override
    public Node findRootNode() {
        // (Non-orphan) comments are not integrated into the normal AST; we need to get the commented node first.
        Node n = getCommentedNode().orElse(this);
        while (n.getParentNode().isPresent()) {
            n = n.getParentNode().get();
        }
        return n;
    }

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

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

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public boolean isBlockComment() {
        return false;
    }

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public BlockComment asBlockComment() {
        throw new IllegalStateException(
                f("%s is not BlockComment, it is %s", this, this.getClass().getSimpleName()));
    }

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public boolean isJavadocComment() {
        return false;
    }

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public JavadocComment asJavadocComment() {
        throw new IllegalStateException(
                f("%s is not JavadocComment, it is %s", this, this.getClass().getSimpleName()));
    }

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public void ifBlockComment(Consumer action) {}

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public void ifJavadocComment(Consumer action) {}

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public void ifLineComment(Consumer action) {}

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public Optional toBlockComment() {
        return Optional.empty();
    }

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public Optional toJavadocComment() {
        return Optional.empty();
    }

    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public Optional toLineComment() {
        return Optional.empty();
    }

    /*
     * Header is "//" for line comment
     */
    public abstract String getHeader();

    /*
     *
     */
    public abstract String getFooter();

    /*
     * Returns the content of the comment with header and footer
     */
    public String asString() {
        return getHeader() + getContent() + getFooter();
    }
}