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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL `count` set function.
#
# @example
# (prefix ((: <http://www.example.org>))
# (project (?C)
# (extend ((?C ??.0))
# (group () ((??.0 (count ?O)))
# (bgp (triple ?S ?P ?O))))))
#
# @see https://www.w3.org/TR/sparql11-query/#defn_aggCount
class Count < Operator
include Aggregate
NAME = :count
##
# Count is a SPARQL set function which counts the number of times a given expression has a bound, and non-error value within the aggregate group.
#
# @param [Enumerable<Array<RDF::Term>>] enum
# enum of evaluated operand
# @return [RDF::Literal::Integer] The number of non-error terms in the multiset
def apply(enum)
RDF::Literal(enum.length)
end
end # Count
end # Operator
end; end # SPARQL::Algebra
Version data entries
5 entries across 5 versions & 1 rubygems