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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `round` operator.
#
# Returns the number with no fractional part that is closest to the argument. If there are two such numbers, then the one that is closest to positive infinity is returned. An error is raised if `arg` is not a numeric value.
#
# [121] BuiltInCall ::= ... 'ROUND' '(' Expression ')'
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
# SELECT ?s ?num (ROUND(?num) AS ?round) WHERE {
# ?s :num ?num
# }
#
# @example SSE
# (prefix
# ((: <http://example.org/>)
# (xsd: <http://www.w3.org/2001/XMLSchema#>))
# (project (?s ?num ?round)
# (extend ((?round (round ?num)))
# (bgp (triple ?s :num ?num)))))
#
# @see https://www.w3.org/TR/sparql11-query/#func-round
# @see https://www.w3.org/TR/xpath-functions/#func-round
class Round < Operator::Unary
include Evaluatable
NAME = [:round]
##
# Returns the number with no fractional part that is closest to the argument. If there are two such numbers, then the one that is closest to positive infinity is returned. An error is raised if arg is not a numeric value.
#
# @param [RDF::Literal] operand
# the operand
# @return [RDF::Literal] literal of same type
# @raise [TypeError] if the operand is not a numeric value
def apply(operand, **options)
case operand
when RDF::Literal::Numeric then operand.round
else raise TypeError, "expected an RDF::Literal::Numeric, but got #{operand.inspect}"
end
end
end # Round
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"ROUND(#{operands.to_sparql(**options)})"
end
end # Operator
end; end # SPARQL::Algebra
Version data entries
8 entries across 8 versions & 1 rubygems