if @source
      @str = event.get(@source)
      if @delimiter
        @split_str = @str.split(@delimiter, @fields.length)

        if @target
          @result = {}
          @split_str.each_with_index do |f, i|
            @result[fields[i]] = f
          end
          event.set(@target, @result)
        else
          @split_str.each_with_index do |f, i|
            event.set(@fields[i], f)
          end
        end
      end
    end