class RDF::N3::Algebra::Time::InSeconds

Iff the subject is a ‘xsd:dateTime` and the object is the integer number of seconds since the beginning of the era on a given system. Don’t assume a particular value, always test for it. The object can be calculated as a function of the subject.

@see www.w3.org/TR/xpath-functions/#func-timezone-from-dateTime

Constants

NAME
URI

Public Instance Methods

input_operand() click to toggle source

Return both subject and object operands.

@return [RDF::Term]

# File lib/rdf/n3/algebra/time/in_seconds.rb, line 54
def input_operand
  RDF::N3::List.new(values: operands)
end
resolve(resource, position:) click to toggle source

The time:inseconds operator takes may have either a bound subject or object.

@param [RDF::Term] resource @param [:subject, :object] position @return [RDF::Term] @see RDF::N3::ResourceOperator#evaluate

# File lib/rdf/n3/algebra/time/in_seconds.rb, line 17
def resolve(resource, position:)
  case position
  when :subject
    case resource
    when RDF::Query::Variable
      resource
    when RDF::Literal
      # Subject evaluates to seconds from the epoc
      RDF::Literal::Integer.new(resource.as_datetime.object.strftime("%s"))
    else
      nil
    end
  when :object
    case resource
    when RDF::Query::Variable
      resource
    when RDF::Literal
      resource = resource.as_number
      # Object evaluates to the DateTime representation of the seconds form the epoc
      RDF::Literal(RDF::Literal::DateTime.new(::Time.at(resource).utc.to_datetime).to_s)
    else
      nil
    end
  end
end
valid?(subject, object) click to toggle source

Either subject or object must be a bound resource

# File lib/rdf/n3/algebra/time/in_seconds.rb, line 44
def valid?(subject, object)
  return true if subject.literal? || object.literal?
  log_error(NAME) {"subject or object are not literals: #{subject.inspect}, #{object.inspect}"}
  false
end