Class: SPARQL::Algebra::Operator::Contains

Inherits:
Binary show all
Includes:
Evaluatable
Defined in:
vendor/bundler/ruby/2.5.0/bundler/gems/sparql-b66c70fb77a0/lib/sparql/algebra/operator/contains.rb

Overview

A SPARQL contains operator.

Constant Summary collapse

NAME =
:contains

Constants inherited from Binary

Binary::ARITY

Constants inherited from SPARQL::Algebra::Operator

ARITY, IsURI, URI

Instance Attribute Summary

Attributes inherited from SPARQL::Algebra::Operator

#operands

Instance Method Summary collapse

Methods included from Evaluatable

#evaluate, #memoize, #replace_aggregate!, #replace_vars!

Methods inherited from Binary

#initialize

Methods inherited from SPARQL::Algebra::Operator

#aggregate?, arity, #base_uri, base_uri, base_uri=, #boolean, #constant?, #each_descendant, #eql?, #evaluatable?, evaluate, #executable?, #first_ancestor, for, #initialize, #inspect, #ndvars, #node?, #operand, #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, 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) ⇒ RDF::Literal::Boolean

The CONTAINS function corresponds to the XPath fn:contains. The arguments must be argument compatible otherwise an error is raised.

Examples:

contains("foobar", "bar") #=> true
contains("foobar"@en, "foo"@en) #=> true
contains("foobar"^^xsd:string, "bar"^^xsd:string) #=> true
contains("foobar"^^xsd:string, "foo") #=> true
contains("foobar", "bar"^^xsd:string) #=> true
contains("foobar"@en, "foo") #=> true
contains("foobar"@en, "bar"^^xsd:string) #=> true

Parameters:

Returns:

Raises:

  • (TypeError)

    if operands are not compatible



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/sparql-b66c70fb77a0/lib/sparql/algebra/operator/contains.rb', line 34

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