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Contents
module SPARQL; module Algebra
##
# Mixin for Algebra::Operator sub-classes that evaluate bindings to return a result
#
# @abstract
module Evaluatable
##
# Evaluates this operator using the given variable `bindings`.
#
# @param [RDF::Query::Solution, #[]] bindings
# a query solution containing zero or more variable bindings
# @return [RDF::Term]
# @abstract
def evaluate(bindings = {})
args = operands.map { |operand| operand.evaluate(bindings) }
options[:memoize] ? memoize(*args) : apply(*args)
end
##
# @param [Array<RDF::Term>] operands
# evaluated operands
# @return [RDF::Term] the memoized result
def memoize(*operands)
@cache ||= RDF::Util::Cache.new(options[:memoize].is_a?(Integer) ? options[:memoize] : -1)
@cache[operands] ||= apply(*operands)
end
##
# @param [Array<RDF::Term>] operands
# evaluated operands
# @return [RDF::Term]
# @abstract
def apply(*operands)
raise NotImplementedError, "#{self.class}#apply(#{operands.map(&:class).join(', ')})"
end
end # Query
end; end # SPARQL::Algebra
Version data entries
16 entries across 16 versions & 1 rubygems