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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `hours` operator.
#
# [121] BuiltInCall ::= ... | 'HOURS' '(' Expression ')'
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# SELECT ?s (HOURS(?date) AS ?x) WHERE {
# ?s :date ?date
# }
#
# @example SSE
# (prefix
# ((: <http://example.org/>))
# (project (?s ?x)
# (extend ((?x (hours ?date)))
# (bgp (triple ?s :date ?date)))))
#
# @see https://www.w3.org/TR/sparql11-query/#func-hours
class Hours < Operator::Unary
include Evaluatable
NAME = :hours
##
# Returns the hours part of `arg` as an integer. The value is as given in the lexical form of the XSD dateTime.
#
# @param [RDF::Literal] operand
# the operand
# @return [RDF::Literal::Temporal]
# @raise [TypeError] if the operand is not a simple literal
def apply(operand, **options)
raise TypeError, "expected an RDF::Literal::Temporal, but got #{operand.inspect}" unless operand.is_a?(RDF::Literal::Temporal)
RDF::Literal(operand.object.hour)
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"HOURS(#{operands.last.to_sparql(**options)})"
end
end # Hours
end # Operator
end; end # SPARQL::Algebra
Version data entries
6 entries across 6 versions & 1 rubygems