Class: RDF::N3::Algebra::List::First

Inherits:

RDF::N3::Algebra::ListOperator

• Object
• SPARQL::Algebra::Operator::Binary
• RDF::N3::Algebra::ListOperator
• RDF::N3::Algebra::List::First

Defined in:

lib/rdf/n3/algebra/list/first.rb

Overview

Iff the subject is a list and the object is the first thing that list, then this is true. The object can be calculated as a function of the list.

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

Examples:

{ ( 1 2 3 4 5 6 ) list:first 1 } => { :test1 a :SUCCESS }.

Constant Summary

NAME =

:listFirst

URI =

RDF::N3::List.first

Instance Attribute Summary

Attributes included from Enumerable

#existentials, #universals

Instance Method Summary

• #resolve(list) ⇒ RDF::Term

  Resolves this operator using the given variable bindings.

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

#as_literal, #execute, #input_operand, #validate

Methods included from Builtin

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

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:

• list (RDF::N3::List)

Returns:

• (RDF::Term)

See Also:

• ListOperator#evaluate

# File 'lib/rdf/n3/algebra/list/first.rb', line 20

def resolve(list)
  list.first
end