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: factory.rb
    path of file: ./repos/gitlabhq/lib/gitlab/config/entry
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module Config
    module Entry
      ##
      # Factory class responsible for fabricating entry objects.
      #
      class Factory
        InvalidFactory = Cl
    
        def fabricate_unspecified
          ##
          # If entry has a default value we fabricate concrete node
          # with default value.
          #
          default = @attributes.fetch(:default)

          if default.nil?
            fabricate(Entry::Undefined)
          else
            fabricate(entry_class, default)
          end