Module: Jena::Node

Defined in:
lib/jena_jruby/node_utils.rb

Overview

A collection of utilities for manipulating Jena RDF Resources and Literals, collectively known as RDFNodes.

Class Method Summary collapse

Class Method Details

.literal_types(node, default_type = nil) ⇒ Object

Return an array of the datatype of the given literal, if defined, and including the default_type if non-nil



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# File 'lib/jena_jruby/node_utils.rb', line 23

def self.literal_types( node, default_type = nil )
  types = node.getDatatype ? [node.getDatatype] : []
  with_default_type( types, default_type )
end

.resource_types(node, default_type = nil) ⇒ Object

Return the values of ‘rdf:type` for the given resource



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# File 'lib/jena_jruby/node_utils.rb', line 15

def self.resource_types( node, default_type = nil )
  types = []
  node.each_property( Jena::Vocab::RDF.type ) {|stmt| types << stmt.getObject}
  with_default_type( types, default_type )
end

.types(node, default_type = nil) ⇒ Object

Return the types of a node, which will be an array of the RDF types for a resource, or an array of the (zero or one) datatypes if the node is a literal. Ensures that the returned array includes the default_type f default_type is non-nil



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# File 'lib/jena_jruby/node_utils.rb', line 9

def self.types( node, default_type = nil )
  return self.resource_types( node, default_type ) if node.resource?
  self.literal_types( node, default_type )
end

.with_default_type(types, default_type) ⇒ Object 



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# File 'lib/jena_jruby/node_utils.rb', line 30

def self.with_default_type( types, default_type )
  types << default_type if default_type && !types.include?( default_type )
  types
end