module Fog class DNS def self.new(attributes) attributes = attributes.dup # prevent delete from having side effects case provider = attributes[:provider] # attributes.delete(:provider) when 'AWS' require 'fog/dns/aws' Fog::AWS::DNS.new(attributes) when 'Linode' require 'fog/dns/linode' Fog::Linode::DNS.new(attributes) when 'Slicehost' require 'fog/dns/slicehost' Fog::Slicehost::DNS.new(attributes) when 'Zerigo' require 'fog/dns/zerigo' Fog::Zerigo::DNS.new(attributes) else raise ArgumentError.new("#{provider} is not a recognized storage provider") end end end end