class RDF::Query::Variable
Extensions for `RDF::Query::Variable`.
Public Instance Methods
evaluate(bindings, **options)
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Returns the value of this variable in the given `bindings`.
@param [RDF::Query::Solution] bindings
a query solution containing zero or more variable bindings
@param [Hash{Symbol => Object}] options ({})
options passed from query
@return [RDF::Term] the value of this variable @raise [TypeError] if the variable is not bound
# File lib/sparql/algebra/extensions.rb, line 519 def evaluate(bindings, **options) raise TypeError if bindings.respond_to?(:bound?) && !bindings.bound?(self) bindings[name.to_sym] end
optimize(**options)
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Return self
@return [RDF::Query::Variable] a copy of `self` @see SPARQL::Algebra::Expression#optimize
# File lib/sparql/algebra/extensions.rb, line 529 def optimize(**options) self end
to_sxp()
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Display variable as SXP @return [Array]
# File lib/sparql/algebra/extensions.rb, line 535 def to_sxp prefix = distinguished? ? (existential? ? '$' : '?') : (existential? ? '$$' : '??') unbound? ? "#{prefix}#{name}".to_sym.to_sxp : ["#{prefix}#{name}".to_sym, value].to_sxp end