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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL numeric `multiply` operator.
#
# [117] MultiplicativeExpression::= UnaryExpression ( '*' UnaryExpression | '/' UnaryExpression )*
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# SELECT ?s WHERE {
# ?s :p ?o .
# ?s2 :p ?o2 .
# FILTER(?o * ?o2 = 4) .
# }
#
# @example SSE
# (prefix ((: <http://example.org/>))
# (project (?s)
# (filter (= (* ?o ?o2) 4)
# (bgp
# (triple ?s :p ?o)
# (triple ?s2 :p ?o2)))))
#
# @see https://www.w3.org/TR/xpath-functions/#func-numeric-multiply
class Multiply < Operator::Binary
include Evaluatable
NAME = [:*, :multiply]
##
# Returns the arithmetic product of the operands.
#
# @param [RDF::Literal::Numeric] left
# a numeric literal
# @param [RDF::Literal::Numeric] right
# a numeric literal
# @return [RDF::Literal::Numeric]
# @raise [TypeError] if either operand is not a numeric literal
def apply(left, right, **options)
case
when left.is_a?(RDF::Literal::Numeric) && right.is_a?(RDF::Literal::Numeric)
left * right
else raise TypeError, "expected two RDF::Literal::Numeric operands, but got #{left.inspect} and #{right.inspect}"
end
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"(#{operands.first.to_sparql(**options)} * #{operands.last.to_sparql(**options)})"
end
end # Multiply
end # Operator
end; end # SPARQL::Algebra
Version data entries
7 entries across 7 versions & 1 rubygems