Class: SPARQL::Algebra::Operator::Month

Inherits:

Unary

• Object
• SPARQL::Algebra::Operator
• Unary
• SPARQL::Algebra::Operator::Month

Includes:

Evaluatable

Defined in:

vendor/bundler/ruby/3.2.0/bundler/gems/sparql-d7206d0f0d39/lib/sparql/algebra/operator/month.rb

Overview

The SPARQL logical month operator.

Returns the month part of arg as an integer.

[121] BuiltInCall ::= ... | 'MONTH' '(' Expression ')'

Examples:

SPARQL Grammar

PREFIX : <http://example.org/>
SELECT ?s (MONTH(?date) AS ?x) WHERE {
  ?s :date ?date
}

SSE

(prefix
 ((: <http://example.org/>))
 (project (?s ?x)
  (extend ((?x (month ?date)))
   (bgp (triple ?s :date ?date)))))

See Also:

• https://www.w3.org/TR/sparql11-query/#func-month

Constant Summary

NAME =

:month

Constants inherited from Unary

Unary::ARITY

Constants inherited from SPARQL::Algebra::Operator

ARITY, IsURI, URI

Constants included from Expression

Expression::PATTERN_PARENTS

Constants included from RDF::Util::Logger

RDF::Util::Logger::IOWrapper

Instance Attribute Summary

Attributes inherited from SPARQL::Algebra::Operator

#operands

Instance Method Summary

• #apply(operand, **options) ⇒ RDF::Literal::Temporal

  Returns the month part of arg as an integer.

• #to_sparql(**options) ⇒ String

  Returns a partial SPARQL grammar for this operator.

Methods included from Evaluatable

#evaluate, #memoize, #replace_aggregate!, #replace_vars!

Methods inherited from Unary

#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_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?

Methods included from RDF::Util::Logger

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

Constructor Details

This class inherits a constructor from SPARQL::Algebra::Operator::Unary

Instance Method Details

#apply(operand, **options) ⇒ RDF::Literal::Temporal

Returns the month part of arg as an integer.

Parameters:

• operand (RDF::Literal) —

  the operand

Returns:

• (RDF::Literal::Temporal)

Raises:

• (TypeError) —

  if the operand is not a simple literal

# File 'vendor/bundler/ruby/3.2.0/bundler/gems/sparql-d7206d0f0d39/lib/sparql/algebra/operator/month.rb', line 36

def apply(operand, **options)
  raise TypeError, "expected an RDF::Literal::Temporal, but got #{operand.inspect}" unless operand.is_a?(RDF::Literal::Temporal)
  RDF::Literal(operand.object.month)
end

#to_sparql(**options) ⇒ String

Returns a partial SPARQL grammar for this operator.

Returns:

• (String)

# File 'vendor/bundler/ruby/3.2.0/bundler/gems/sparql-d7206d0f0d39/lib/sparql/algebra/operator/month.rb', line 46

def to_sparql(**options)
  "MONTH(#{operands.last.to_sparql(**options)})"
end