module ROF::Translators::JsonldToRof::PredicateObjectHandler

We need to handle the Predicate / Object pair as one (thank you RDF blank nodes for this nuance)

@see ROF::Translators::JsonldToRof::PredicateObjectHandler.call

Public Class Methods

call(predicate, object, accumulator, options = {}) click to toggle source

@api public

Parse the RDF::Predicate, RDF::Object and the relevant data to the contents to the accumulator

@example

Given the following 4 RDF N-Triples (subject, predicate, object). The first and second RDF objects are RDF::Literal. The 3rd triple's object is
and RDF::Node. And the last is an RDF::URI. Each require different handlers as they have nuanced differences.
  _:b0 <http://purl.org/dc/terms/contributor> "David R.Hyde" .
  _:b0 <http://www.ndltd.org/standards/metadata/etdms/1.1/role> "Research Director" .
  <https://curate.nd.edu/show/zk51vd69n1r> <http://purl.org/dc/terms/contributor> _:b0 .
  <https://curate.nd.edu/show/zk51vd69n1r> <http://projecthydra.org/ns/relations#hasEditorGroup> <https://curate.nd.edu/show/q524jm23g92> .

@note It is assumed that all blank nodes (e.g. RDF::Node) will be processed before you process any RDF::URI nodes.

@param [RDF::Predicate] predicate - the RDF predicate that we will parse and add to the appropriate spot in the accumulator @param [RDF::Object] object - the RDF object that we will parse and add to the appropriate spot in the accumulator @param [ROF::Translators::JsonldToRof::Accumulator] accumulator - a data accumulator that will be changed in place @return [ROF::Translators::JsonldToRof::Accumulator] the given accumulator @raise [ROF::Translators::JsonldToRof::UnknownRdfObjectTypeError] when the RDF::Object's subject is not a valid type

# File lib/rof/translators/jsonld_to_rof/predicate_object_handler.rb, line 30
def self.call(predicate, object, accumulator, options = {})
  new(predicate, object, accumulator, options).call
  accumulator
end

Private Class Methods

klass_for(object) click to toggle source

@api private

# File lib/rof/translators/jsonld_to_rof/predicate_object_handler.rb, line 50
def self.klass_for(object)
  case object
  when RDF::URI
    UriPredicateObjectHandler
  when RDF::Node
    NodePredicateObjectHandler
  when RDF::Literal
    LiteralPredicateObjectHandler
  else
    raise UnknownRdfObjectTypeError, "Unable to determine object handler for #{object.inspect}"
  end
end
new(predicate, object, accumulator, options) click to toggle source

@api private

@param [RDF::Predicate] predicate - the RDF predicate that we will parse and add to the appropriate spot in the accumulator @param [RDF::Object] object - the RDF object that we will parse and add to the appropriate spot in the accumulator @param [ROF::Translators::JsonldToRof::Accumulator] accumulator - a data accumulator that will be changed in place @return [#call]

# File lib/rof/translators/jsonld_to_rof/predicate_object_handler.rb, line 41
def self.new(predicate, object, accumulator, options)
  klass_for(object).new(predicate, object, accumulator, options)
end