Class: Factbase::IndexedOne

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

Overview

Indexed term ‘one’.

Instance Method Summary collapse

Constructor Details

#initialize(term, idx) ⇒ IndexedOne

Returns a new instance of IndexedOne.



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# File 'lib/factbase/indexed/indexed_one.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_one.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: [], indexed_count: 0 }
    @idx[key] = entry
  end
  if entry[:indexed_count] < maps_array.size
    prop = @term.operands.first.to_s
    maps_array[entry[:indexed_count]..].each do |m|
      entry[:facts] << m if !m[prop].nil? && m[prop].size == 1
    end
    entry[:indexed_count] = maps_array.size
  end
  (maps & []) | entry[:facts]
end