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module RDF::N3::Algebra::Log
##
# The subject is a key and the object is a string, where the strings are to be output in the order of the keys.
class OutputString < RDF::N3::Algebra::ResourceOperator
NAME = :logOutputString
URI = RDF::N3::Log.outputString
##
# Resolves inputs as strings.
#
# @param [RDF::Term] resource
# @param [:subject, :object] position
# @return [RDF::Term]
# @see RDF::N3::ResourceOperator#evaluate
def resolve(resource, position:)
SPARQL::Algebra::Expression.cast(RDF::XSD.string, resource) if resource.term?
end
##
# Returns `term2`, but adds `term2` as an output keyed on `term1`.
#
# @param [RDF::Term] term1
# an RDF term
# @param [RDF::Term] term2
# an RDF term
# @return [RDF::Literal::Boolean] `true` or `false`
# @raise [TypeError] if either operand is not an RDF term or operands are not comperable
#
# @see RDF::Term#==
def apply(term1, term2)
(@options[:strings][term1.to_s] ||= []) << term2.to_s
term2
end
# Both subject and object are inputs.
def input_operand
RDF::N3::List.new(values: operands)
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems