class SPARQL::Algebra::Operator::NotIn
The SPARQL
GraphPattern `in` operator.
Used for filters with more than one expression.
@example
(ask (filter (notin ?o 1 2) (bgp)))
Constants
- NAME
Public Instance Methods
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 (…)).
@example
2 NOT IN (1, 2, 3) false 2 NOT IN () true 2 NOT IN (<http://example/iri>, "str", 2.0) false 2 NOT IN (1/0, 2) false 2 NOT IN (2, 1/0) false 2 NOT IN (3, 1/0) raises an error
@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::Literal::Boolean] `true` or `false` @raise [TypeError] if term is not found and any operand raises an error
# File lib/sparql/algebra/operator/notin.rb, line 45 def evaluate(bindings, **options) lhs = operands.first.evaluate(bindings, depth: options[:depth].to_i + 1, **options) error_found = false found = operands[1..-1].any? do |op| begin lhs == op.evaluate(bindings, depth: options[:depth].to_i + 1, **options) 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