def log_definition
      return unless @log.debug?
      @log.debug  "Filter: #{self}"
      Filter.single_write_accessors.keys.each do |name, gmail_name|
        val = send(:"get_#{name}")
        @log.debug "  #{name}: #{val}" if val
      end
      self
    end
def log_definition
      return unless @log.debug?
      @log.debug  "Filter: #{self}"
      Filter.single_write_accessors.keys.each do |name, gmail_name|
        val = send(:"get_#{name}")
        @log.debug "  #{name}: #{val}" if val
      end
      self
    end
Note a filter definition on the logger.
 @note for debugging only.