Class: SPARQL::Algebra::Operator::NotIn
- Inherits:
-
SPARQL::Algebra::Operator
- Object
- SPARQL::Algebra::Operator
- SPARQL::Algebra::Operator::NotIn
- Includes:
- Evaluatable
- Defined in:
- lib/sparql/algebra/operator/notin.rb
Overview
The SPARQL GraphPattern in
operator.
Used for filters with more than one expression.
[114] RelationalExpression ::= NumericExpression (‘NOT’ ‘IN’ ExpressionList)?
Constant Summary collapse
- NAME =
:notin
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::Literal::Boolean
The NOT IN operator tests whether the RDF term on the left-hand side is not found in the values of list of expressions on the right-hand side.
-
#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 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
Instance Method Details
#evaluate(bindings, **options) ⇒ RDF::Literal::Boolean
The NOT IN operator tests whether the RDF term on the left-hand side is not found in the values of list of expressions on the right-hand side. The test is done with “!=” operator, which tests for not the same value, as determined by the operator mapping.
A list of zero terms on the right-hand side is legal.
Errors in comparisons cause the NOT IN expression to raise an error if the RDF term being tested is not found to be in the list elsewhere in the list of terms.
The NOT IN operator is equivalent to the SPARQL expression:
(lhs != expression1) && (lhs != expression2) && ...
NOT IN (…) is equivalent to !(IN (…)).
50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 |
# File 'lib/sparql/algebra/operator/notin.rb', line 50 def evaluate(bindings, **) lhs = operands.first.evaluate(bindings, **.merge(depth: [:depth].to_i + 1)) error_found = false found = operands[1..-1].any? do |op| begin lhs == op.evaluate(bindings, **.merge(depth: [:depth].to_i + 1)) rescue TypeError error_found = true end end case when found then RDF::Literal::FALSE when error_found then raise TypeError else RDF::Literal::TRUE end end |
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
72 73 74 75 76 77 |
# File 'lib/sparql/algebra/operator/notin.rb', line 72 def to_sparql(**) "(" + operands.first.to_sparql(**) + " NOT IN (" + operands[1..-1].map {|e| e.to_sparql(**)}.join(", ") + "))" end |