Class: SPARQL::Algebra::Operator::StrLen
- Inherits:
-
Unary
- Object
- SPARQL::Algebra::Operator
- Unary
- SPARQL::Algebra::Operator::StrLen
- Includes:
- Evaluatable
- Defined in:
- vendor/bundler/ruby/3.0.0/bundler/gems/sparql-ffa592c8f275/lib/sparql/algebra/operator/strlen.rb
Overview
The SPARQL strlen
operator.
Constant Summary collapse
- NAME =
:strlen
Constants inherited from Unary
Constants inherited from SPARQL::Algebra::Operator
Instance Attribute Summary
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse
-
#apply(operand) ⇒ RDF::Literal::Integer
The strlen function corresponds to the XPath fn:string-length function and returns an xsd:integer equal to the length in characters of the lexical form of the literal.
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(operand) ⇒ RDF::Literal::Integer
The strlen function corresponds to the XPath fn:string-length function and returns an xsd:integer equal to the length in characters of the lexical form of the literal.
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# File 'vendor/bundler/ruby/3.0.0/bundler/gems/sparql-ffa592c8f275/lib/sparql/algebra/operator/strlen.rb', line 28 def apply(operand) raise TypeError, "expected a plain RDF::Literal, but got #{operand.inspect}" unless operand.literal? && operand.plain? RDF::Literal(operand.to_s.length) end |