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: acls_dir.rb
    path of file: ./repos/chef/lib/chef/chef_fs/file_system/chef_server
    
    the code of the file until where you have to start completion: #
# Author:: John Keiser (<jkeiser@chef.io>)
# Copyright:: Copyright (c) Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or a
    
          def children
            if @children.nil?
              @children = ENTITY_TYPES.map do |entity_type|
                # All three of these can be versioned (NAME-VERSION), but only have
                # one ACL that covers them all (NAME.json).
                case entity_type
                when "cookbooks", "cookbook_artifacts"
                  CookbooksAclDir.new(entity_type, self)
                when "policies"
                  PoliciesAclDir.new(entity_type, self)
                else
                  AclDir.new(entity_type, self)
                end
              end