module Unbreakable
  module Observers
    # Logs debug messages when files are stored or skipped if the observed
    # object has a +#log+ method.
    class Log < Observer
      # (see Observer#update)
      def update(method, *args)
        if observed.respond_to? :log
          case method
          when :store
            observed.log.debug "Store #{args.first}"
          when :skip
            observed.log.debug "Skip #{args.first}"
          end
        end
      end
    end
  end
end