file_db.rb

class FileDb
  def self.open(path)
    if File.exist?(path)
      file = File.open(path, "r")
      self.parse(file.read)
    else
      Hash.new
    end
  ensure
    file.close if file
  end
 
  def self.parse(text)
    params = Hash.new
    text.each_line do |line|
      key_value = line.split("=")
      params[key_value[0]] = key_value[1]
    end
    params
  end
 
  # TODO Scalone: think in atomic operation
  # Rename in pax create a new file, so isn't a SO/System file operation
  def self.persist(path, params)
    file_new = File.open(path, "w+")
    params.each do |line_key, line_value|
      file_new.write("#{line_key}=#{line_value}\n")
    end
    file_new.close
  end
end