Class: RDF::N3::Algebra::List::Append

Inherits:
RDF::N3::Algebra::ListOperator show all
Defined in:
vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/algebra/list/append.rb

Overview

Iff the subject is a list of lists and the concatenation of all those lists is the object, then this is true. The object can be calculated as a function of the subject.

The object can be calculated as a function of the subject.

Examples:

( (1 2) (3 4) ) list:append (1 2 3 4).

Constant Summary collapse

NAME = 
:listAppend
URI = 
RDF::N3::List.append

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

Constants included from SPARQL::Algebra::Expression

SPARQL::Algebra::Expression::PATTERN_PARENTS

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

#as_literal, #execute, #input_operand

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, #canonicalize, #canonicalize!, #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?, #graph_names, #invalid?, #method_missing, #object?, #objects, #predicate?, #predicates, #project_graph, #quad?, #quads, #respond_to_missing?, #statement?, #statements, #subject?, #subjects, #supports?, #term?, #terms, #to_a, #to_h, #to_set, #triple?, #triples, #valid?, #validate!

Methods included from Util::Aliasing::LateBound

#alias_method

Methods included from Isomorphic

#bijection_to, #isomorphic_with?

Methods included from Countable

#count, #empty?

Methods included from SPARQL::Algebra::Update

#execute, #graph_name=, #unshift, #variables

Methods included from SPARQL::Algebra::Query

#each_solution, #empty?, #execute, #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, #mergable?, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, prefixes, #prefixes, prefixes=, #rewrite, #to_binary, #to_sparql, to_sparql, #to_sxp, #to_sxp_bin, #validate!, #variable?, #variables, #vars

Methods included from SPARQL::Algebra::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

Dynamic Method Handling

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

Instance Method Details

#resolve(list) ⇒ RDF::Term

Resolves 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:

See Also:

  • ListOperator#evaluate


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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/algebra/list/append.rb', line 20

def resolve(list)
  flattened = list.to_a.map(&:to_a).flatten
  # Bind a new list based on the values, whos subject use made up from original list subjects
  subj = RDF::Node.intern(list.map(&:subject).hash)
  RDF::N3::List.new(subject: subj, values: flattened)
end

#validate(list) ⇒ Boolean

The list argument must be a pair of literals.

Parameters:

Returns:

  • (Boolean)

See Also:

  • ListOperator#validate


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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/algebra/list/append.rb', line 33

def validate(list)
  if super && list.to_a.all? {|li| li.list?}
    true
  else
    log_error(NAME) {"operand is not a list of lists: #{list.to_sxp}"}
    false
  end
end