# File lib/rhc/commands/domain.rb, line 162
      def check_allowed_gear_sizes
        raise OptionParser::InvalidOption, "--allowed-gear-sizes and --no-allowed-gear-sizes cannot both be specified" unless options.allowed_gear_sizes.nil? or options.no_allowed_gear_sizes.nil?
        sizes = options.no_allowed_gear_sizes.nil? ? options.allowed_gear_sizes : false
        raise OptionParser::InvalidOption, "The server does not support --allowed-gear-sizes" unless sizes.nil? || rest_client.api.has_param?(:add_domain, 'allowed_gear_sizes')
        if sizes.is_a? String
          sizes.split(',').map(&:strip).map(&:presence)
        elsif sizes == false
          []
        elsif sizes
          raise OptionParser::InvalidOption, "Provide a comma delimited list of valid gear sizes to --allowed-gear-sizes"
        end
      end