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Contents
require 'securerandom'
module SPARQL; module Algebra
class Operator
##
# The SPARQL `uuid` function.
#
# @example
# (prefix ((: <http://example.org/>)
# (xsd: <http://www.w3.org/2001/XMLSchema#>))
# (project (?length)
# (extend ((?length (strlen ?uuid)))
# (filter (&& (isLiteral ?uuid) (regex ?uuid "^[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}$" "i"))
# (extend ((?uuid (struuid)))
# (bgp))))))
#
# @see http://www.w3.org/TR/sparql11-query/#func-struuid
class StrUUID < Operator::Nullary
include Evaluatable
NAME = :struuid
##
# Return a string that is the scheme specific part of UUID. That is, as a simple literal, the result of generating a UUID, converting to a simple literal and removing the initial urn:uuid:.
#
# @return [RDF::URI]
def apply
RDF::Literal(SecureRandom.uuid)
end
end # StrUUID
end # Operator
end; end # SPARQL::Algebra
Version data entries
28 entries across 28 versions & 1 rubygems