# File lib/fog/xenserver.rb, line 26
      def request(options, *params)
        begin
          parser   = options.delete(:parser)
          method   = options.delete(:method)
          
          if params.empty?
            response = @factory.call(method, @credentials)
          else
            if params.length.eql?(1) and params.first.is_a?(Hash)
              response = @factory.call(method, @credentials, params.first)
            elsif params.length.eql?(2) and params.last.is_a?(Array)
              response = @factory.call(method, @credentials, params.first, params.last)
            else
              response = eval("@factory.call('#{method}', '#{@credentials}', #{params.map {|p|  p.is_a?(String) ? "'#{p}'" : p}.join(',')})")
            end
          end
          raise RequestFailed.new("#{method}: " + response["ErrorDescription"].to_s) unless response["Status"].eql? "Success"
          if parser
            parser.parse( response["Value"] )
            response = parser.response
          end
          
          response
        end
      end