Class: SPARQL::Algebra::Operator::Asc
- Inherits:
-
Unary
- Object
- SPARQL::Algebra::Operator
- Unary
- SPARQL::Algebra::Operator::Asc
- Includes:
- Evaluatable
- Defined in:
- lib/sparql/algebra/operator/asc.rb
Overview
The SPARQL ascending sort operator.
[24] OrderCondition ::= ( ( ‘ASC’ | ‘DESC’ ) BrackettedExpression ) | ( Constraint | Var )
Direct Known Subclasses
Constant Summary collapse
- NAME =
:asc
Constants inherited from Unary
Constants inherited from SPARQL::Algebra::Operator
Constants included from Expression
Instance Attribute Summary
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse
-
#evaluate(bindings, **options) ⇒ RDF::Term
Returns the evaluation of its operand.
-
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
Methods included from Evaluatable
#apply, #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, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, to_sparql, #to_sxp, #to_sxp_bin, #validate!, #variable?, #variables, #vars
Methods included from Expression
cast, #constant?, extension, 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
#evaluate(bindings, **options) ⇒ RDF::Term
Returns the evaluation of its operand. Default comparison is in ascending order. Ordering is applied in Order.
35 36 37 |
# File 'lib/sparql/algebra/operator/asc.rb', line 35 def evaluate(bindings, **) operand(0).evaluate(bindings, **.merge(depth: [:depth].to_i + 1)) end |
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
Provides order to descendant query.
46 47 48 |
# File 'lib/sparql/algebra/operator/asc.rb', line 46 def to_sparql(**) "ASC(#{operands.last.to_sparql(**)})" end |