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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.assertNonEmpty;
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.NodeList;
import com.github.javaparser.ast.nodeTypes.NodeWithIdentifier;
import com.github.javaparser.ast.nodeTypes.NodeWithTypeArguments;
import com.github.javaparser.ast.observer.ObservableProperty;
import com.github.javaparser.ast.type.Type;
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.MethodReferenceExprMetaModel;
import com.github.javaparser.metamodel.NonEmptyProperty;
import com.github.javaparser.metamodel.OptionalProperty;
import com.github.javaparser.resolution.Resolvable;
import com.github.javaparser.resolution.declarations.ResolvedMethodDeclaration;
import java.util.Optional;
import java.util.function.Consumer;

/**
 * Method reference expressions introduced in Java 8 specifically designed to simplify lambda Expressions.
 * Note that the field "identifier", indicating the word to the right of the ::, is not always a method name,
 * it can be "new".
 * 
In {@code System.out::println;} the scope is System.out and the identifier is "println"
 * 
{@code (test ? stream.map(String::trim) : stream)::toArray;}
 * 
In {@code Bar::new} the String type argument is on the scope,
 * and the Integer type argument is on this MethodReferenceExpr.
 *
 * @author Raquel Pau
 */
public class MethodReferenceExpr extends Expression
        implements NodeWithTypeArguments,
                NodeWithIdentifier,
                Resolvable {

    private Expression scope;

    @OptionalProperty
    private NodeList typeArguments;

    @NonEmptyProperty
    private String identifier;

    public MethodReferenceExpr() {
        this(null, new ClassExpr(), null, "empty");
    }

    @AllFieldsConstructor
    public MethodReferenceExpr(Expression scope, NodeList typeArguments, String identifier) {
        this(null, scope, typeArguments, identifier);
    }

    /**
     * This constructor is used by the parser and is considered private.
     */
    @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
    public MethodReferenceExpr(
            TokenRange tokenRange, Expression scope, NodeList typeArguments, String identifier) {
        super(tokenRange);
        setScope(scope);
        setTypeArguments(typeArguments);
        setIdentifier(identifier);
        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 getScope() {
        return scope;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public MethodReferenceExpr setScope(final Expression scope) {
        assertNotNull(scope);
        if (scope == this.scope) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.SCOPE, this.scope, scope);
        if (this.scope != null) this.scope.setParentNode(null);
        this.scope = scope;
        setAsParentNodeOf(scope);
        return this;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public Optional> getTypeArguments() {
        return Optional.ofNullable(typeArguments);
    }

    /**
     * Sets the typeArguments
     *
     * @param typeArguments the typeArguments, can be null
     * @return this, the MethodReferenceExpr
     */
    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public MethodReferenceExpr setTypeArguments(final NodeList typeArguments) {
        if (typeArguments == this.typeArguments) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.TYPE_ARGUMENTS, this.typeArguments, typeArguments);
        if (this.typeArguments != null) this.typeArguments.setParentNode(null);
        this.typeArguments = typeArguments;
        setAsParentNodeOf(typeArguments);
        return this;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public String getIdentifier() {
        return identifier;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public MethodReferenceExpr setIdentifier(final String identifier) {
        assertNonEmpty(identifier);
        if (identifier == this.identifier) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.IDENTIFIER, this.identifier, identifier);
        this.identifier = identifier;
        return this;
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.RemoveMethodGenerator")
    public boolean remove(Node node) {
        if (node == null) {
            return false;
        }
        if (typeArguments != null) {
            for (int i = 0; i < typeArguments.size(); i++) {
                if (typeArguments.get(i) == node) {
                    typeArguments.remove(i);
                    return true;
                }
            }
        }
        return super.remove(node);
    }

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

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

    @Override
    @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")
    public boolean replace(Node node, Node replacementNode) {
        if (node == null) {
            return false;
        }
        if (node == scope) {
            setScope((Expression) replacementNode);
            return true;
        }
        if (typeArguments != null) {
            for (int i = 0; i < typeArguments.size(); i++) {
                if (typeArguments.get(i) == node) {
                    typeArguments.set(i, (Type) replacementNode);
                    return true;
                }
            }
        }
        return super.replace(node, replacementNode);
    }

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

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

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

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

    /**
     * @return the method declaration this method reference is referencing.
     */
    @Override
    public ResolvedMethodDeclaration resolve() {
        return getSymbolResolver().resolveDeclaration(this, ResolvedMethodDeclaration.class);
    }

    /*
     * Method reference expressions are always poly expressions
     * (https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html 15.13. Method Reference Expressions)
     */
    @Override
    public boolean isPolyExpression() {
        return true;
    }
}