You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: a.rb
    path of file: ./repos/metasploit-framework/lib/net/dns/rr
    
    the code of the file until where you have to start completion: # -*- coding: binary -*-
##
#
# Net::DNS::RR::A
#
# $id$
#
##

require 'ipaddr
    
        def subclass_new_from_hash(args)
          if args.has_key? :address 
            @address = check_address args[:address]
          elsif args.has_key? :rdata
            @address = check_address args[:rdata]
          else
            # Address field is mandatory
            raise RRArgumentError, ":address field is mandatory but missing"
          end