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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL UPDATE `modify` operator.
#
# Wraps delete/insert
#
# @example
# (modify
# (bgp (triple ?a foaf:knows ?b))
# (delete ((triple ?a foaf:knows ?b)))
# (insert ((triple ?b foaf:knows ?a)))
#
# @see XXX
class Modify < Operator
include SPARQL::Algebra::Update
NAME = [:modify]
##
# Executes this upate on the given `writable` graph or repository.
#
# Execute the first operand to get solutions, and apply those solutions to the subsequent operators.
#
# @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) {"Modify"}
query = operands.shift
queryable.query(query, options.merge(depth: options[:depth].to_i + 1)) do |solution|
debug(options) {"(solution)=>#{solution.inspect}"}
# Execute each operand with queryable and solution
operands.each do |op|
op.execute(queryable, solution, options.merge(depth: options[:depth].to_i + 1))
end
end
queryable
end
end # Modify
end # Operator
end; end # SPARQL::Algebra
Version data entries
17 entries across 17 versions & 1 rubygems