Class: SPARQL::Algebra::Operator::Divide

Inherits:
Binary show all
Includes:
Evaluatable
Defined in:
lib/sparql/algebra/operator/divide.rb

Overview

The SPARQL numeric divide operator.

Constant Summary collapse

NAME =
[:'/', :divide]

Constants inherited from Binary

Binary::ARITY

Constants inherited from SPARQL::Algebra::Operator

ARITY

Instance Attribute Summary

Attributes inherited from SPARQL::Algebra::Operator

#operands, #options

Instance Method Summary collapse

Methods included from Evaluatable

#evaluate, #memoize

Methods inherited from Binary

#initialize

Methods inherited from SPARQL::Algebra::Operator

arity, base_uri, #base_uri, base_uri=, #boolean, #constant?, #eql?, #evaluatable?, evaluate, #executable?, for, #initialize, #inspect, #operand, #optimize, prefixes, #prefixes, prefixes=, #to_sse, #to_sxp, #variable?

Methods included from Expression

cast, #constant?, #evaluate, for, new, open, #optimize, parse, #to_sse, #variable?

Constructor Details

This class inherits a constructor from SPARQL::Algebra::Operator::Binary

Instance Method Details

#apply(left, right) ⇒ RDF::Literal::Numeric

Returns the arithmetic quotient of the operands.

Parameters:

  • left (RDF::Literal::Numeric)

    a numeric literal

  • right (RDF::Literal::Numeric)

    a numeric literal

Returns:

  • (RDF::Literal::Numeric)

Raises:

  • (TypeError)

    if either operand is not a numeric literal


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# File 'lib/sparql/algebra/operator/divide.rb', line 24

def apply(left, right)
  case
    when left.is_a?(RDF::Literal::Numeric) && right.is_a?(RDF::Literal::Numeric)
      # For xsd:decimal and xsd:integer operands, if the divisor is
      # (positive or negative) zero, an error is raised.
      raise ZeroDivisionError, "divided by #{right}" if left.is_a?(RDF::Literal::Decimal) && right.zero?

      # As a special case, if the types of both operands are
      # xsd:integer, then the return type is xsd:decimal.
      if left.is_a?(RDF::Literal::Integer) && right.is_a?(RDF::Literal::Integer)
        RDF::Literal(left.to_d / right.to_d)
      else
        left / right
      end
    else raise TypeError, "expected two RDF::Literal::Numeric operands, but got #{left.inspect} and #{right.inspect}"
  end
end