class DomainVariable {
    private $domain;

    function __construct($domain = null) {
        if($domain == null) {
            $this->domain = DomainVariable::get_domain();
        } else {
            $this->domain $domain;
        }
    }

    function get($name) {
        $all = variable_get($name, null);
        if($all != null) {
            return $all[$this->domain];
        }
        return null;
    }

    function set($name, $value) {
        $existing = variable_get($name, null);
        if($existing != null) {
            $existing[$this->domain] = $value;
            variable_set($name, $existing);
        } else {
            variable_set($name, array($this->domain => $value));
        }
    }

    static function get_domain() {
        return domain_get_domain();
    }
}

?>