Class: Omnizip::Algorithms::PPMd8::RestorationMethod

Inherits:
Object
  • Object
show all
Includes:
Constants
Defined in:
lib/omnizip/algorithms/ppmd8/restoration_method.rb

Overview

Strategy pattern for PPMd8 restoration methods

PPMd8 supports multiple restoration methods that determine how the model handles memory management and context updating when memory is exhausted.

Constant Summary

Constants included from Constants

Constants::BIN_SCALE, Constants::DEFAULT_RESTORE_METHOD, Constants::GLUE_COUNT_THRESHOLD, Constants::INIT_ESCAPE_FREQ, Constants::INTERVAL, Constants::INT_BITS, Constants::MAX_FREQ, Constants::MAX_STATES, Constants::PERIOD_BITS, Constants::PROB_TOTAL, Constants::RESTORE_METHOD_CUT_OFF, Constants::RESTORE_METHOD_RESTART, Constants::SEE_CONTEXTS, Constants::SUFFIX_CONTEXTS, Constants::UNIT_ALLOC_SIZE, Constants::UNIT_SIZE

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(method_type = RESTORE_METHOD_RESTART) ⇒ RestorationMethod

Initialize restoration method

Parameters:

  • method_type (Integer) (defaults to: RESTORE_METHOD_RESTART) —

    The restoration method type



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# File 'lib/omnizip/algorithms/ppmd8/restoration_method.rb', line 39

def initialize(method_type = RESTORE_METHOD_RESTART)
  @method_type = method_type
end

Instance Attribute Details

#method_type ⇒ Object (readonly)

Returns the value of attribute method_type.



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# File 'lib/omnizip/algorithms/ppmd8/restoration_method.rb', line 34

def method_type
  @method_type
end

Instance Method Details

#restore(model) ⇒ void

This method returns an undefined value.

Execute restoration based on the selected method

Parameters:

  • model (Model) —

    The PPMd8 model to restore



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# File 'lib/omnizip/algorithms/ppmd8/restoration_method.rb', line 47

def restore(model)
  case @method_type
  when RESTORE_METHOD_RESTART
    restart_restoration(model)
  when RESTORE_METHOD_CUT_OFF
    cut_off_restoration(model)
  else
    raise ArgumentError, "Unknown restoration method: #{@method_type}"
  end
end