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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL UPDATE `drop` operator.
#
# The DROP operation removes the specified graph(s) from the Graph Store
#
# Equivalent to `clear` in this implementation
#
# @example
# (drop default)
#
# @see http://www.w3.org/TR/sparql11-update/#drop
class Drop < Operator
include SPARQL::Algebra::Update
NAME = [:drop]
##
# 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) {"Drop"}
silent = operands.first == :silent
silent = operands.first == :silent
operands.shift if silent
raise ArgumentError, "drop expected operand to be 'default', 'named', 'all', or an IRI" unless operands.length == 1
case operands.last
when :default
queryable.each_graph do |g|
g.clear! unless g.context
end
when :named
queryable.each_graph do |g|
g.clear! if g.context
end
when :all
queryable.clear!
when RDF::URI
if g = queryable.each_graph.detect {|c| c.context == operands.last}
g.clear!
else
raise IOError, "drop operation graph does not exist" unless silent
end
else
raise ArgumentError, "drop expected operand to be 'default', 'named', 'all', or an IRI"
end
queryable
end
end # Drop
end # Operator
end; end # SPARQL::Algebra
Version data entries
5 entries across 5 versions & 1 rubygems