Class: RDF::N3::Algebra::Time::Hour

Inherits:
ResourceOperator
  • Object
show all
Defined in:
lib/rdf/n3/algebra/time/hour.rb

Overview

For a date-time, its time:hour is the hour in the 24 hour clock.

See Also:

Constant Summary collapse

NAME = 
:timeHour
URI = 
RDF::N3::Time.hour

Instance Attribute Summary

Attributes included from Enumerable

#existentials, #universals

Instance Method Summary collapse

Methods inherited from ResourceOperator

#as_literal, #execute, #input_operand

Methods included from Builtin

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

Instance Method Details

#resolve(resource, position:) ⇒ RDF::Term

The time:hour operator takes string or dateTime and extracts the hour component.

Parameters:

  • resource (RDF::Term)
  • position (:subject, :object)

Returns:

See Also:

  • ResourceOperator#evaluate


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# File 'lib/rdf/n3/algebra/time/hour.rb', line 17

def resolve(resource, position:)
  case position
  when :subject
    return nil unless resource.literal?
    resource.as_datetime.hours
  when :object
    return nil unless resource.literal? || resource.variable?
    resource
  end
end

#valid?(subject, object) ⇒ Boolean

There is no hour unless it was specified in the lexical form

Returns:

  • (Boolean) 


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# File 'lib/rdf/n3/algebra/time/hour.rb', line 30

def valid?(subject, object)
  subject.value.match?(%r(^\d{4}-\d{2}-\d{2}T\d{2}))
end