Class: Wongi::Engine::AlphaIndex

Inherits:
Object
  • Object
show all
Defined in:
lib/wongi-engine/alpha_index.rb

Instance Method Summary collapse

Constructor Details

#initialize(pattern) ⇒ AlphaIndex

Returns a new instance of AlphaIndex.



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# File 'lib/wongi-engine/alpha_index.rb', line 7

def initialize(pattern)
  @pattern = pattern
  @index = Hash.new { |h, k| h[k] = Set.new }
end

Instance Method Details

#add(wme) ⇒ Object 



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# File 'lib/wongi-engine/alpha_index.rb', line 12

def add(wme)
  collection_for_wme(wme).add(wme)
end

#collection_for_wme(wme) ⇒ Object 



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# File 'lib/wongi-engine/alpha_index.rb', line 24

def collection_for_wme(wme)
  index[hashed_key(wme)]
end

#remove(wme) ⇒ Object 



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# File 'lib/wongi-engine/alpha_index.rb', line 16

def remove(wme)
  collection = collection_for_wme(wme)
  collection.delete(wme)

  # release some memory
  index.delete(hashed_key(wme)) if collection.empty?
end