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module SPARQL; module Algebra
class Operator
##
# The SPARQL `strdt` operator.
#
# [121] BuiltInCall ::= ... | 'STRDT' '(' Expression ',' Expression ')'
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
# SELECT ?s (STRDT(?str,xsd:string) AS ?str1) WHERE {
# ?s :str ?str
# FILTER(LANGMATCHES(LANG(?str), "en"))
# }
#
# @example SSE
# (prefix
# ((: <http://example.org/>) (xsd: <http://www.w3.org/2001/XMLSchema#>))
# (project (?s ?str1)
# (extend ((?str1 (strdt ?str xsd:string)))
# (filter (langMatches (lang ?str) "en")
# (bgp (triple ?s :str ?str))))))
#
# @see https://www.w3.org/TR/sparql11-query/#func-strdt
class StrDT < Operator::Binary
include Evaluatable
NAME = :strdt
##
# Constructs a literal with lexical form and type as specified by the arguments.
#
# @param [RDF::Literal] value
# a literal
# @param [RDF::URI] datatypeIRI
# datatype
# @return [RDF::Literal] a datatyped literal
# @see https://www.w3.org/TR/sparql11-query/#func-strdt
def apply(value, datatypeIRI, **options)
raise TypeError, "Literal #{value.inspect} is not simple" unless value.simple?
RDF::Literal.new(value.to_s, datatype: datatypeIRI)
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"STRDT(" + operands.to_sparql(delimiter: ', ', **options) + ")"
end
end # StrDT
end # Operator
end; end # SPARQL::Algebra
Version data entries
8 entries across 8 versions & 1 rubygems