}

    private
    fun <T : Any?> queryKotlinMetadata(ctClass: CtClass, defaultResult: T, query: (KotlinClassMetadata) -> T): T =
        ctClass.metadata
            ?.let { KotlinClassMetadata.read(it) }
            ?.let { query(it) }
            ?: defaultResult

    private
    val CtClass.metadata: Metadata?
        get() = ctAnnotation<Metadata>()?.let { annotation ->

    fun <T : Any?> executeQuery(apiSourceFile: ApiSourceFile.Java, query: JavaSourceQuery<T>): T =
        openJavaCompilationUnitsByFile
            .computeIfAbsent(apiSourceFile.currentFile) { JavaParser().parse(it).getResult().get() }
            .accept(query.visitor, null)
            ?: query.defaultValue