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module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `timezone` operator.
#
# Returns the timezone part of `arg` as an xsd:dayTimeDuration. Raises an error if there is no timezone.
#
# @example
# (prefix ((: <http://example.org/>))
# (project (?s ?x)
# (extend ((?x (timezone ?date)))
# (bgp (triple ?s :date ?date)))))
#
# @see http://www.w3.org/TR/sparql11-query/#func-timezone
class Timezone < Operator::Unary
include Evaluatable
NAME = :timezone
##
# Returns the timezone part of arg as an xsd:dayTimeDuration. Raises an error if there is no timezone.
#
# This function corresponds to fn:timezone-from-dateTime except for the treatment of literals with no timezone.
#
# @param [RDF::Literal] operand
# the operand
# @return [RDF::Literal]
# @raise [TypeError] if the operand is not a simple literal
def apply(operand)
raise TypeError, "expected an RDF::Literal::DateTime, but got #{operand.inspect}" unless operand.is_a?(RDF::Literal::DateTime)
raise TypeError, "literal has no timezone" unless res = operand.timezone
res
end
end # Timezone
end # Operator
end; end # SPARQL::Algebra
Version data entries
11 entries across 11 versions & 1 rubygems