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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `year` operator.
#
# Returns the year part of `arg` as an integer.
#
# @example
# (prefix ((: <http://example.org/>))
# (project (?s ?x)
# (extend ((?x (year ?date)))
# (bgp (triple ?s :date ?date)))))
#
# @see http://www.w3.org/TR/sparql11-query/#func-year
class Year < Operator::Unary
include Evaluatable
NAME = :year
##
# Returns the year part of arg as an integer.
#
# @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)
RDF::Literal(operand.object.year)
end
end # Year
end # Operator
end; end # SPARQL::Algebra
Version data entries
11 entries across 11 versions & 1 rubygems