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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL Table operator.
#
# This is used to provide inline values. Each row becomes
# a solution.
#
# @example
# (table (vars ?book ?title)
# (row (?title "SPARQL Tutorial"))
# (row (?book :book2)))
#
# @example empty table
# (table unit)
# @see https://www.w3.org/TR/2013/REC-sparql11-query-20130321/#inline-data
class Table < Operator
include Query
NAME = [:table]
##
# Returns solutions for each row
#
# @param [RDF::Queryable] queryable
# the graph or repository to query
# @param [Hash{Symbol => Object}] options
# any additional keyword options
# @yield [solution]
# each matching solution
# @yieldparam [RDF::Query::Solution] solution
# @yieldreturn [void] ignored
# @return [RDF::Query::Solutions]
# the resulting solution sequence
# @see https://www.w3.org/TR/sparql11-query/#sparqlAlgebra
def execute(queryable, **options, &block)
@solutions = RDF::Query::Solutions()
Array(operands[1..-1]).each do |row|
next unless row.is_a?(Array)
bindings = row[1..-1].inject({}) do |memo, (var, value)|
memo[var.to_sym] = value unless value == :undef
memo
end
@solutions << RDF::Query::Solution.new(bindings)
end
@solutions.each(&block) if block_given?
@solutions
end
end # Table
end # Operator
end; end # SPARQL::Algebra
Version data entries
7 entries across 7 versions & 1 rubygems