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Contents
require 'time'
module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `now` operator.
#
# Returns an XSD dateTime value for the current query execution. All calls to this function in any one query execution must return the same value. The exact moment returned is not specified.
#
# [121] BuiltInCall ::= ... | 'NOW' NIL
#
# @example SPARQL Grammar
# PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
# ASK {
# BIND(NOW() AS ?n)
# FILTER(DATATYPE(?n) = xsd:dateTime)
# }
#
# @example SSE
# (prefix ((xsd: <http://www.w3.org/2001/XMLSchema#>))
# (ask
# (filter (= (datatype ?n) xsd:dateTime)
# (extend ((?n (now)))
# (bgp)))))
#
# @see https://www.w3.org/TR/sparql11-query/#func-now
class Now < Operator::Nullary
include Evaluatable
NAME = :now
##
# Returns an XSD dateTime value for the current query execution. All calls to this function in any one query execution must return the same value. The exact moment returned is not specified.
#
# @return [RDF::Literal::Double] random value
def apply(**options)
RDF::Literal(DateTime.now)
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"NOW()"
end
end # Now
end # Operator
end; end # SPARQL::Algebra
Version data entries
8 entries across 8 versions & 1 rubygems