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Contents
require 'securerandom'
module SPARQL; module Algebra
class Operator
##
# The SPARQL `uuid` function.
#
# [121] BuiltInCall ::= ... | 'UUID' NIL
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
# ASK {
# BIND(UUID() AS ?u1)
# BIND(UUID() AS ?u2)
# FILTER(?u1 != ?u2)
# }
#
# @example SSE
# (prefix
# ((: <http://example.org/>) (xsd: <http://www.w3.org/2001/XMLSchema#>))
# (ask
# (filter (!= ?u1 ?u2)
# (extend ((?u1 (uuid)) (?u2 (uuid)))
# (bgp)))))
#
# @see https://www.w3.org/TR/sparql11-query/#func-uuid
class UUID < Operator::Nullary
include Evaluatable
NAME = :uuid
##
# Return a fresh IRI from the UUID URN scheme. Each call of UUID() returns a different UUID. It must not be the "nil" UUID (all zeroes). The variant and version of the UUID is implementation dependent.
#
# @return [RDF::URI]
def apply(**options)
RDF::URI("urn:uuid:#{SecureRandom.uuid}")
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"UUID(" + operands.to_sparql(delimiter: ', ', **options) + ")"
end
end # UUID
end # Operator
end; end # SPARQL::Algebra
Version data entries
8 entries across 8 versions & 1 rubygems