class OMPClass(ctx: Java8Parser.ClassDeclarationContext, parser: Java8Parser) {
    val nestedClasses = (new ClassExtractor ).visit(ctx.classBody()).map(c => new OMPClass(c, parser))
    val methods       = (new MethodExtractor ).visit(ctx.classBody()).map(c => new OMPMethod(c, parser))
    val fields        = (new FieldExtractor ).visit(ctx.classBody()).map(c => new OMPVariable(c.`type`(), c.variableDeclarators(), parser))
}