Class: DumpCleaner::Cleanup::CleaningSteps::RandomizeNumber

Inherits:
Base
  • Object
show all
Defined in:
lib/dump_cleaner/cleanup/cleaning_steps/randomize_number.rb

Instance Attribute Summary

Attributes inherited from Base

#step_context

Instance Method Summary collapse

Methods inherited from Base

#crc32, #initialize, #raise_params_error

Constructor Details

This class inherits a constructor from DumpCleaner::Cleanup::CleaningSteps::Base

Instance Method Details

#run(difference_within: 1.0) ⇒ Object 



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# File 'lib/dump_cleaner/cleanup/cleaning_steps/randomize_number.rb', line 7

def run(difference_within: 1.0)
  random = Random.new(crc32)

  new_value = current_value.to_f + random.rand(difference_within.to_f * 2) - difference_within.to_f

  # keep sign to keep string length (warning: this skews the distribution of the random numbers)
  if (current_value.strip[0] == "-") && new_value.positive? ||
     (current_value.strip[0] != "-") && new_value.negative?
    new_value *= -1
  end

  decimal_places = current_value.split(".")[1].to_s.length
  epsilon = 10**-decimal_places
  clamped_value = new_value.clamp(current_value.to_f - difference_within + epsilon,
                                  current_value.to_f + difference_within - epsilon)

  step_context.current_value = format("%0#{current_value.length}.#{decimal_places}f", clamped_value)
  step_context
end