require 'fedux_org/stdlib/logic_converters/exceptions'

module FeduxOrg
  module Stdlib
    module LogicConverters
      class TrueFalseConverter

        # @param [true,false] value
        #   the logic value which should be converted
        # @return [String]
        #   the converted value: true => 'true', false => 'false', '' => nil
        def parse( value )
          case value
          when true
            'true'
          when false
            'false'
          when ''
            nil
          else
            raise FeduxOrg::Stdlib::LogicConverters::Exceptions::InvalidValue, "Unknown logic value \"#{value}\"."
          end
        end
      end
    end
  end
end