Class: Factbase::IndexedNot

Inherits:
Object
  • Object
show all
Defined in:
lib/factbase/indexed/indexed_not.rb

Overview

Indexed term ‘not’.

Instance Method Summary collapse

Constructor Details

#initialize(term, idx) ⇒ IndexedNot

Returns a new instance of IndexedNot.



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# File 'lib/factbase/indexed/indexed_not.rb', line 8

def initialize(term, idx)
  @term = term
  @idx = idx
end

Instance Method Details

#predict(maps, fb, params) ⇒ Object 



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# File 'lib/factbase/indexed/indexed_not.rb', line 13

def predict(maps, fb, params)
  return nil if @idx.nil?
  key = [maps.object_id, @term.operands.first, @term.op]
  entry = @idx[key]
  maps_array = maps.to_a
  if entry.nil?
    entry = { facts: nil, indexed_count: 0, yes_set: nil }
    @idx[key] = entry
  end
  if entry[:indexed_count] < maps_array.size
    yes = @term.operands.first.predict(maps, fb, params)
    if yes.nil?
      entry[:facts] = nil
      entry[:yes_set] = nil
    else
      yes_set = yes.to_a.to_set
      entry[:yes_set] = yes_set
      entry[:facts] = maps_array.reject { |m| yes_set.include?(m) }
    end
    entry[:indexed_count] = maps_array.size
  end
  r = entry[:facts]
  if r.nil?
    nil
  else
    (maps & []) | r
  end
end