article wrapper class that locks down some options, passes others through

Question

I'm writing a wrapper document class that starts with article and adds a bunch of customizations (required for a particular journal style). One of the requirements is to lock down certain options:

\documentclass{thisjournal}

should behave the same as

\documentclass[10pt,twocolumn,letterpaper]{article}
% plus some more stuff

and

\documentclass[12pt]{thisjournal} % or 'onecolumn', or 'a4paper, etc

should produce an error message, but other options should be passed through, e.g.

\documentclass[draft]{thisjournal} % should turn on overfull rules

I've gotten as far as

\ProvidesClass{thisjournal}
\DeclareOption{12pt}{\ClassError{testclass}{Ten point text is required.}}
\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
\ProcessOptions\relax
\LoadClass[10pt,twocolumn,letterpaper]{article}

but I am unenthusiastic about having to write \DeclareOption boilerplate for every possible font and paper size option other than 10pt and letterpaper. (Is it even possible to enumerate that set?) Surely there is a better way?

Answer 1

Expanding on Gonzalo's answer, you can iterate through the options you want to kill. (As th base classes do not use key-value methods, it's not like you only have to kill the 'key' part, regrettably.)

\@for\@tempa:=10pt,12pt,14pt,letterpaper,a4paper,onecolumn,twocolumn\do{%
  \DeclareOption{\@tempa}{\OptionNotUsed}%    
}

Answer 2

You can use \OptionNotUsed; for example,

\DeclareOption{12pt}{\OptionNotUsed}