Class: SPARQL::Algebra::Operator::Contains
- Inherits:
-
Binary
- Object
- SPARQL::Algebra::Operator
- Binary
- SPARQL::Algebra::Operator::Contains
- Includes:
- Evaluatable
- Defined in:
- lib/sparql/algebra/operator/contains.rb
Overview
A SPARQL contains
operator.
[121] BuiltInCall ::= … | ‘CONTAINS’ ‘(’ Expression ‘,’ Expression ‘)’
Constant Summary collapse
- NAME =
:contains
Constants inherited from Binary
Constants inherited from SPARQL::Algebra::Operator
Constants included from Expression
Instance Attribute Summary
Attributes inherited from SPARQL::Algebra::Operator
Instance Method Summary collapse
-
#apply(left, right, **options) ⇒ RDF::Literal::Boolean
The
CONTAINS
function corresponds to the XPath fn:contains. -
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
Methods included from Evaluatable
#evaluate, #memoize, #replace_aggregate!, #replace_vars!
Methods inherited from Binary
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?, #evaluate, 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::Binary
Instance Method Details
#apply(left, right, **options) ⇒ RDF::Literal::Boolean
The CONTAINS
function corresponds to the XPath fn:contains. The arguments must be argument compatible otherwise an error is raised.
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# File 'lib/sparql/algebra/operator/contains.rb', line 47 def apply(left, right, **) case when !left.compatible?(right) raise TypeError, "expected two RDF::Literal operands, but got #{left.inspect} and #{right.inspect}" when left.to_s.include?(right.to_s) then RDF::Literal::TRUE else RDF::Literal::FALSE end end |
#to_sparql(**options) ⇒ String
Returns a partial SPARQL grammar for this operator.
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# File 'lib/sparql/algebra/operator/contains.rb', line 61 def to_sparql(**) "contains(" + operands.to_sparql(delimiter: ', ', **) + ")" end |