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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.utils;

import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.visitor.GenericVisitor;
import com.github.javaparser.ast.visitor.Visitable;
import com.github.javaparser.ast.visitor.VoidVisitor;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * A map that overrides the equals and hashcode calculation of the added nodes
 * by using another equals and hashcode visitor for those methods.
 */
public class VisitorMap implements Map {

    private final Map innerMap = new HashMap<>();

    private final GenericVisitor hashcodeVisitor;

    private final GenericVisitor equalsVisitor;

    /**
     * Pass the visitors to use for equals and hashcode.
     */
    public VisitorMap(GenericVisitor hashcodeVisitor, GenericVisitor equalsVisitor) {
        this.hashcodeVisitor = hashcodeVisitor;
        this.equalsVisitor = equalsVisitor;
    }

    @Override
    public int size() {
        return innerMap.size();
    }

    @Override
    public boolean isEmpty() {
        return innerMap.isEmpty();
    }

    @Override
    public boolean containsKey(Object key) {
        return innerMap.containsKey(new EqualsHashcodeOverridingFacade((N) key));
    }

    @Override
    public boolean containsValue(Object value) {
        return innerMap.containsValue(value);
    }

    @Override
    public V get(Object key) {
        return innerMap.get(new EqualsHashcodeOverridingFacade((N) key));
    }

    @Override
    public V put(N key, V value) {
        return innerMap.put(new EqualsHashcodeOverridingFacade(key), value);
    }

    private class EqualsHashcodeOverridingFacade implements Visitable {

        private final N overridden;

        EqualsHashcodeOverridingFacade(N overridden) {
            this.overridden = overridden;
        }

        @Override
        public  R accept(GenericVisitor v, A arg) {
            throw new AssertionError();
        }

        @Override
        public  void accept(VoidVisitor v, A arg) {
            throw new AssertionError();
        }

        @Override
        public final int hashCode() {
            return overridden.accept(hashcodeVisitor, null);
        }

        @Override
        public boolean equals(final Object obj) {
            if (obj == null || !(obj instanceof VisitorMap.EqualsHashcodeOverridingFacade)) {
                return false;
            }
            return overridden.accept(equalsVisitor, ((EqualsHashcodeOverridingFacade) obj).overridden);
        }
    }

    @Override
    public V remove(Object key) {
        return innerMap.remove(new EqualsHashcodeOverridingFacade((N) key));
    }

    @Override
    public void putAll(Map m) {
        m.forEach(this::put);
    }

    @Override
    public void clear() {
        innerMap.clear();
    }

    @Override
    public Set keySet() {
        return innerMap.keySet().stream().map(k -> k.overridden).collect(Collectors.toSet());
    }

    @Override
    public Collection values() {
        return innerMap.values();
    }

    @Override
    public Set> entrySet() {
        return innerMap.entrySet().stream()
                .map(e -> new HashMap.SimpleEntry<>(e.getKey().overridden, e.getValue()))
                .collect(Collectors.toSet());
    }
}