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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL UPDATE `delete` operator.
#
# The DELETE operation is a form of the DELETE/INSERT operation having no INSERT section
#
# @example
# (delete ((triple ?s ?p ?o))))
#
# @see http://www.w3.org/TR/sparql11-update/#delete
class Delete < Operator::Unary
include SPARQL::Algebra::Update
NAME = [:delete]
##
# Executes this upate on the given `writable` graph or repository.
#
# @param [RDF::Queryable] queryable
# the graph or repository to write
# @param [RDF::Query::Solution] solution
# Solution to map to patterns for this operation
# @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, solution, options = {})
debug(options) {"Delete: #{solution} against #{operands.to_sse}"}
# Operands are an array of patterns and Queries (when named).
# Create a new query made up all patterns
patterns = operand.inject([]) do |memo, op|
if op.respond_to?(:statements)
memo += op.statements.to_a
else
memo << op
end
memo
end
patterns.each do |pattern|
pattern = pattern.dup.bind(solution)
debug(options) {"Delete statement #{statement.to_sse}"}
queryable.delete(RDF::Statement.from(pattern)) if pattern.bound? || pattern.constant?
end
queryable
end
end # Delete
end # Operator
end; end # SPARQL::Algebra
Version data entries
17 entries across 17 versions & 1 rubygems