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Contents
require 'securerandom'
module SPARQL; module Algebra
class Operator
##
# [121] BuiltInCall ::= ... | 'STRUUID' NIL
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
# SELECT (STRLEN(?uuid) AS ?length)
# WHERE {
# BIND(STRUUID() AS ?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}$", "i"))
# }
#
# @example SSE
# (prefix ((: <http://example.org/>) (xsd: <http://www.w3.org/2001/XMLSchema#>))
# (project (?length)
# (extend ((?length (strlen ?uuid)))
# (filter
# (&&
# (isLiteral ?uuid)
# (regex ?uuid "^[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}$" "i"))
# (extend ((?uuid (struuid)))
# (bgp))))))
#
# @see https://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(**options)
RDF::Literal(SecureRandom.uuid)
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"STRUUID(" + operands.to_sparql(delimiter: ', ', **options) + ")"
end
end # StrUUID
end # Operator
end; end # SPARQL::Algebra
Version data entries
8 entries across 8 versions & 1 rubygems