require 'common/errors'

class Domain

  @domain = nil

  def initialize(domain)
    if domain.empty? then
      msg = "domain cannot be empty"
      raise InvalidDomainError.new(msg)
    end

    @domain = domain
  end

  def to_s()
    return @domain
  end

  def ==(other)
    return self.to_s() == other.to_s()
  end

  def <=>(other)
    return self.to_s() <=> other.to_s()
  end
end