Class: SPARQL::Algebra::Operator::NotOneOf

Inherits:
SPARQL::Algebra::Operator show all
Includes:
Query
Defined in:
vendor/bundler/ruby/2.4.0/bundler/gems/sparql-e0a915196943/lib/sparql/algebra/operator/notoneof.rb

Overview

The SPARQL Property Path notoneof (NegatedPropertySet) operator.

Examples:

(notoneof ex:p1 ex:p2)

See Also:

Constant Summary

NAME =
:notoneof

Constants inherited from SPARQL::Algebra::Operator

ARITY, IsURI, URI

Instance Attribute Summary

Attributes included from Query

#solutions

Attributes inherited from SPARQL::Algebra::Operator

#operands

Instance Method Summary collapse

Methods included from Query

#each_solution, #empty?, #failed?, #graph_name=, #matched?, #query_yields_boolean?, #query_yields_solutions?, #query_yields_statements?, #unshift, #variables

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

Instance Method Details

#execute(queryable, options = {}) {|solution| ... } ⇒ Object

Note:

all operands are terms, and not operators, so this can be done by filtering results usin

Equivalant to:

(path (:x (noteoneof :p :q) :y)) => (filter (notin ??p :p :q) (bgp (:x ??p :y)))

Parameters:

  • queryable (RDF::Queryable)

    the graph or repository to query

  • options (Hash{Symbol => Object}) (defaults to: {})

    any additional keyword options

Options Hash (options):

Yields:

  • (solution)

    each matching solution

Yield Parameters:

Yield Returns:

  • (void)

    ignored

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-e0a915196943/lib/sparql/algebra/operator/notoneof.rb', line 34

def execute(queryable, options = {}, &block)
  debug(options) {"NotOneOf #{operands.to_sse}"}
  subject, object = options[:subject], options[:object]

  v = RDF::Query::Variable.new
  v.distinguished = false
  bgp = RDF::Query.new do |q|
    q.pattern [subject, v, object]
  end
  query = Filter.new(NotIn.new(v, *operands), bgp)
  queryable.query(query, options.merge(depth: options[:depth].to_i + 1)) do |solution|
    solution.bindings.delete(v.to_sym)
    debug(options) {"(solution)-> #{solution.to_h.to_sse}"}
    block.call(solution)
  end
end