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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL UPDATE `create` operator.
#
# This operation creates a graph in the Graph Store
#
# This is a no-op for RDF.rb implementations, unless the graph exists
#
# @example
# (create silent <graph>)
#
# @see https://www.w3.org/TR/sparql11-update/#create
class Create < Operator
include SPARQL::Algebra::Update
NAME = [:create]
##
# Executes this upate on the given `writable` graph or repository.
#
# @param [RDF::Queryable] queryable
# the graph or repository to write
# @param [Hash{Symbol => Object}] options
# any additional keyword options
# @option options [Boolean] debug
# Query execution debugging
# @return [RDF::Queryable]
# Returns queryable.
# @raise [IOError]
# If `from` does not exist, unless the `silent` operator is present
# @see https://www.w3.org/TR/sparql11-update/
def execute(queryable, **options)
debug(options) {"Create"}
silent = operands.first == :silent
operands.shift if silent
iri = operands.first
raise ArgumentError, "clear expected a single IRI" if operands.length != 1 || !iri.is_a?(RDF::URI)
if queryable.has_graph?(iri)
raise IOError, "create operation graph #{iri.to_ntriples} exists" unless silent
end
queryable
end
end # Create
end # Operator
end; end # SPARQL::Algebra
Version data entries
7 entries across 7 versions & 1 rubygems