Module: OpenAnnotationHarvest

Included in:
Annotations2triannon::AnnotationList, Annotations2triannon::Manifest
Defined in:
lib/annotations2triannon/open_annotation_harvest.rb

Overview

Module designed to be a mixin for manifest and annotation list. The methods assume that the class including this module contains an #rdf method to access and RDF::Graph object.

Instance Method Summary collapse

Instance Method Details

#collect_open_annotations ⇒ Array<RDF::Graph>

Searches rdf graph to find RDF::Vocab::OA.Annotation

Returns:

  • (Array<RDF::Graph>) —

    for graphs of type RDF::Vocab::OA.Annotation



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# File 'lib/annotations2triannon/open_annotation_harvest.rb', line 9

def collect_open_annotations
  oa_graphs = []
  q = [nil, RDF.type, RDF::Vocab::OA.Annotation]
  # 'rdf' must be a method to access an RDF::Graph object
  rdf.query(q).each_subject do |s|
    oa_graphs << rdf_subject_graph(s)
  end
  oa_graphs
end

#rdf_subject_graph(subject) ⇒ RDF::Graph

Returns graph for ‘subject’ as the ?s in ?s ?p ?o.

Parameters:

  • subject (RDF::Resource) —

    An RDF::Resource

Returns:

  • (RDF::Graph) —

    graph for ‘subject’ as the ?s in ?s ?p ?o



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# File 'lib/annotations2triannon/open_annotation_harvest.rb', line 21

def rdf_subject_graph(subject)
  g = RDF::Graph.new
  # 'rdf' must be a method to access an RDF::Graph object
  rdf.query([subject, nil, nil]) do |s,p,o|
    g << [s,p,o]
    g << rdf_subject_graph(o) if o.node?
    g << rdf_subject_graph(o) if o.uri?
  end
  g
end