yaml to xml conversion

yaml_to_xml.rb

#require 'active_support/core_ext'

class YamlToXml
  def self.yaml_to_xml file_to_read, file_to_write
    doc = String.new
    File.open( file_to_read ) { |yf| doc << YAML.parse( yf ).transform.to_xml }
    File.open( file_to_write, 'w' ) { |f| f.write( doc ) }
  end

  def self.xml_to_yaml file_to_read, file_to_write
    doc = Hash.new
    File.open( file_to_read ) { |xf| doc = Hash.from_xml( xf ) }
    File.open( file_to_write, 'w' ) { |f| f.write( doc.to_yaml ) }
  end
end