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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL UPDATE `load` operator.
#
# The LOAD operation reads an RDF document from a IRI and inserts its triples into the specified graph in the Graph Store. The specified destination graph should be created if required; again, implementations providing an update service over a fixed set of graphs must return with failure for a request that would create a disallowed graph. If the destination graph already exists, then no data in that graph will be removed.
#
# @example
# (load <remote> <g>)
#
# @see http://www.w3.org/TR/sparql11-update/#load
class Load < Operator
include SPARQL::Algebra::Update
NAME = [:load]
##
# 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 http://www.w3.org/TR/sparql11-update/
def execute(queryable, options = {})
debug(options) {"Load"}
silent = operands.first == :silent
operands.shift if silent
raise ArgumentError, "load expected one or two operands, got #{operands.length}" unless [1,2].include?(operands.length)
location, name = operands
queryable.load(location, context: name)
rescue IOError, Errno::ENOENT
raise unless silent
ensure
queryable
end
end # Load
end # Operator
end; end # SPARQL::Algebra
Version data entries
5 entries across 5 versions & 1 rubygems