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

Inherits:
SPARQL::Algebra::Operator show all
Includes:
Query
Defined in:
lib/sparql/algebra/operator/notoneof.rb

Overview

The SPARQL Property Path notoneof (NegatedPropertySet) operator.

[96] PathOneInPropertySet ::= iri | ‘a’ | ‘^’ ( iri | ‘a’ )

Examples:

SPARQL Grammar

PREFIX ex:	<http://www.example.org/schema#>
PREFIX in:	<http://www.example.org/instance#>
ASK { in:a !(ex:p1|ex:p2) ?x }

SSE

(prefix ((ex: <http://www.example.org/schema#>)
        (in: <http://www.example.org/instance#>))
 (ask
  (path in:a (notoneof ex:p1 ex:p2) ?x)))

See Also:

Constant Summary collapse

NAME = 
:notoneof

Constants inherited from SPARQL::Algebra::Operator

ARITY, IsURI, URI

Constants included from Expression

Expression::PATTERN_PARENTS

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=, #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

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}) —

    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 'lib/sparql/algebra/operator/notoneof.rb', line 44

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

  v = RDF::Query::Variable.new(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

#to_sparql(**options) ⇒ String

Returns a partial SPARQL grammar for this operator.

Returns:

  • (String) 


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# File 'lib/sparql/algebra/operator/notoneof.rb', line 65

def to_sparql(**options)
  "!(" + operands.to_sparql(delimiter: ' | ', **options) + ')'
end