Class: RDF::N3::Algebra::List::Member

Inherits:
RDF::N3::Algebra::ListOperator show all
Defined in:
vendor/bundler/ruby/2.7.0/bundler/gems/rdf-n3-8f30bf85f229/lib/rdf/n3/algebra/list/member.rb

Overview

Iff the subject is a list and the object is in that list, then this is true.

Constant Summary collapse

NAME =
:listMember
URI =
RDF::N3::List.member

Constants included from Util::Logger

Util::Logger::IOWrapper

Constants inherited from SPARQL::Algebra::Operator::Binary

SPARQL::Algebra::Operator::Binary::ARITY

Constants inherited from SPARQL::Algebra::Operator

SPARQL::Algebra::Operator::ARITY, SPARQL::Algebra::Operator::IsURI

Instance Attribute Summary

Attributes included from Enumerable

#existentials, #universals

Attributes included from SPARQL::Algebra::Query

#solutions

Attributes inherited from SPARQL::Algebra::Operator

#operands

Instance Method Summary collapse

Methods inherited from RDF::N3::Algebra::ListOperator

#input_operand, #resolve, #validate

Methods included from Builtin

#each, #evaluate, #hash, #input_operand, #rank, #to_uri

Methods included from Util::Logger

#log_debug, #log_depth, #log_error, #log_fatal, #log_info, #log_recover, #log_recovering?, #log_statistics, #log_warn, #logger

Methods included from Enumerable

add_entailment, #dump, #each_graph, #each_object, #each_predicate, #each_quad, #each_statement, #each_subject, #each_term, #each_triple, #entail, #enum_graph, #enum_object, #enum_predicate, #enum_quad, #enum_statement, #enum_subject, #enum_term, #enum_triple, #graph_names, #has_graph?, #has_object?, #has_predicate?, #has_quad?, #has_statement?, #has_subject?, #has_term?, #has_triple?, #invalid?, #method_missing, #objects, #predicates, #project_graph, #quads, #respond_to_missing?, #statements, #subjects, #supports?, #terms, #to_a, #to_h, #to_set, #triples, #valid?, #validate!

Methods included from Util::Aliasing::LateBound

#alias_method

Methods included from Countable

#count, #empty?

Methods included from Isomorphic

#bijection_to, #isomorphic_with?

Methods included from SPARQL::Algebra::Update

#graph_name=, #unshift, #variables

Methods included from SPARQL::Algebra::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::Binary

#initialize

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, #formulae, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, #to_sxp, #to_sxp_bin, #validate!, #variable?, #vars

Methods included from SPARQL::Algebra::Expression

cast, #constant?, #evaluate, 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

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class RDF::Enumerable

Instance Method Details

#execute(queryable, solutions:, **options) ⇒ RDF::Query::Solutions

Evaluates this operator using the given variable bindings. If the last operand is a variable, it creates a solution for each element in the list.

Parameters:

Returns:



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# File 'vendor/bundler/ruby/2.7.0/bundler/gems/rdf-n3-8f30bf85f229/lib/rdf/n3/algebra/list/member.rb', line 17

def execute(queryable, solutions:, **options)
  RDF::Query::Solutions(solutions.map do |solution|
    list = operand(0).evaluate(solution.bindings, formulae: formulae)
    next unless list
    list = RDF::N3::List.try_list(list, queryable).evaluate(solution.bindings, formulae: formulae)
    object = operand(1).evaluate(solution.bindings, formulae: formulae) || operand(1)
    object = formulae[object].deep_dup if object.node? && formulae.has_key?(object)

    log_debug(NAME) {"list: #{list.to_sxp}, object: #{object.to_sxp}"}
    unless list.list? && list.valid?
      log_error(NAME) {"operand is not a list: #{list.to_sxp}"}
      next
    end

    if object.variable?
      # Bind all list entries to this solution, creates an array of solutions
      list.to_a.map do |term|
        solution.merge(object.to_sym => term)
      end
    elsif list.to_a.include?(object)
      solution
    else
      nil
    end
  end.flatten.compact.uniq)
end