Class: Factbase::Size

Inherits:

TermBase

• Object
• TermBase
• Factbase::Size

Defined in:

lib/factbase/terms/size.rb

Overview

Factbase::Size is a term that calculates the size of an operand when evaluated on a given fact.

Instance Method Summary

• #evaluate(fact, _maps, _fb) ⇒ Integer

  Evaluate term on a fact.

• #initialize(operands) ⇒ Size constructor

  Constructor.

Methods included from TermShared

#to_s

Constructor Details

#initialize(operands) ⇒ Size

Constructor.

Parameters:

• operands (Array) —

  Operands

# File 'lib/factbase/terms/size.rb', line 13

def initialize(operands)
  super()
  @operands = operands
end

Instance Method Details

#evaluate(fact, _maps, _fb) ⇒ Integer

Evaluate term on a fact.

Parameters:

• fact (Factbase::Fact) —

  The fact

• _maps (Array<Factbase::Fact>) —

  All maps available

• _fb (Factbase) —

  Factbase to use for sub-queries

Returns:

• (Integer) —

  Size of the operand

# File 'lib/factbase/terms/size.rb', line 23

def evaluate(fact, _maps, _fb)
  assert_args(1)
  v = _by_symbol(0, fact)
  return 0 if v.nil?
  return 1 unless v.respond_to?(:to_a)
  v.size
end