Class: SPARQL::Algebra::Operator::IsBlank
- Inherits:
-
Unary
- Object
- SPARQL::Algebra::Operator
- Unary
- SPARQL::Algebra::Operator::IsBlank
- Includes:
- Evaluatable
- Defined in:
- vendor/bundler/ruby/2.7.0/bundler/gems/sparql-881ac01048a7/lib/sparql/algebra/operator/is_blank.rb
Overview
The SPARQL isBlank
operator.
Constant Summary collapse
- NAME =
:isBlank
Constants inherited from Unary
Constants inherited from SPARQL::Algebra::Operator
Instance Attribute Summary
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse
-
#apply(term) ⇒ RDF::Literal::Boolean
Returns
true
if the operand is anRDF::Node
,false
otherwise.
Methods included from Evaluatable
#evaluate, #memoize, #replace_aggregate!, #replace_vars!
Methods inherited from Unary
Methods inherited from SPARQL::Algebra::Operator
#aggregate?, arity, base_uri, #base_uri, base_uri=, #bind, #boolean, #constant?, #deep_dup, #each_descendant, #eql?, #evaluatable?, evaluate, #executable?, #first_ancestor, for, #formulae, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, #to_sxp, #to_sxp_bin, #validate!, #variable?, #vars
Methods included from Expression
cast, #constant?, #evaluate, extension, extensions, for, #invalid?, new, #node?, open, #optimize, #optimize!, parse, register_extension, #to_sxp_bin, #valid?, #validate!, #variable?
Constructor Details
This class inherits a constructor from SPARQL::Algebra::Operator::Unary
Instance Method Details
#apply(term) ⇒ RDF::Literal::Boolean
Returns true
if the operand is an RDF::Node
, false
otherwise.
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# File 'vendor/bundler/ruby/2.7.0/bundler/gems/sparql-881ac01048a7/lib/sparql/algebra/operator/is_blank.rb', line 26 def apply(term) case term when RDF::Node then RDF::Literal::TRUE when RDF::Term then RDF::Literal::FALSE else raise TypeError, "expected an RDF::Term, but got #{term.inspect}" end end |