Class: TaliaCore::ActiveSourceParts::Xml::RdfBuilder

Inherits:
TaliaUtil::Xml::RdfBuilder show all
Defined in:
lib/talia_core/active_source_parts/xml/rdf_builder.rb

Overview

Class for creating xml-rdf Data from a source. See the parent class, TaliaUtil::Xml::RdfBuilder, for more information.

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from TaliaUtil::Xml::RdfBuilder

open_for_triples, #write_triple, #write_triples, xml_string_for_triples

Methods inherited from TaliaUtil::Xml::BaseBuilder

make_xml_string, open

Class Method Details

.build_source(source) ⇒ Object

Builds the RDF for a source and returns the result as a string



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# File 'lib/talia_core/active_source_parts/xml/rdf_builder.rb', line 10

def self.build_source(source)
  make_xml_string { |build| build.write_source(source) }
end

Instance Method Details

#write_source(source) ⇒ Object

Builds the RDF for a source. This will include both the “direct” predicates as well as the “inverse” (incoming predicates of a source)



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# File 'lib/talia_core/active_source_parts/xml/rdf_builder.rb', line 16

def write_source(source)
  # The source is written as subject, with all the triples nested inside it.
  @builder.rdf :Description, 'rdf:about' => source.uri.to_s do # Element describing this resource
    # loop through the predicates
    source.direct_predicates.each do |predicate|
      write_predicate(predicate, source[predicate])
    end
  end

  # Each of the inverse properties creates another subject entry, that just contains the one
  # triple relating it to the current source. (In this case, the subject and predicate entries
  # aren't merged any further)
  source.inverse_predicates.each do |predicate|
    source.inverse[predicate].each do |inverse_subject|
      @builder.rdf :Description, 'rdf:about' => inverse_subject do
        write_predicate(predicate, [source])
      end
    end
  end
end