Class: Note::SKOS::Base

Inherits:
Base
  • Object
show all
Defined in:
app/models/note/skos/base.rb

Overview

Copyright 2011-2013 innoQ Deutschland GmbH

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.build_from_rdf(rdf_subject, rdf_predicate, rdf_object) ⇒ Object 



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# File 'app/models/note/skos/base.rb', line 20

def self.build_from_rdf(rdf_subject, rdf_predicate, rdf_object)
  # https://github.com/rails/rails/issues/16928
  unless rdf_subject.class.reflections.include?(self.name.to_relation_name.to_s)
    raise "#{self.name}#build_from_rdf: Subject (#{rdf_subject}) must be able to receive this kind of note (#{self.name} => #{self.name.to_relation_name.to_s})."
  end

  target_class = RDFAPI::PREDICATE_DICTIONARY[rdf_predicate] || self
  case rdf_object
  when String # Literal
    unless rdf_object =~ RDFAPI::LITERAL_REGEXP
      raise "#{self.name}#build_from_rdf: Object (#{rdf_object}) must be a string literal"
    end
    lang = $3
    value = JSON.parse(%Q{["#{$1}"]})[0].gsub('\\n', "\n") # Trick to decode \uHHHHH chars
    target_class.new(value: value, language: lang).tap do |new_instance|
      rdf_subject.send(target_class.name.to_relation_name) << new_instance
    end
  when Array # Blank node
    note = target_class.create!(owner: rdf_subject)
    rdf_object.each do |annotation|
      ns, pred = *annotation.first.split(':', 2)
      note.annotations.create! do |a|
        a.namespace = ns
        a.predicate = pred
        a.value = annotation.last.match(/^"(.+)"$/)[1]
      end
    end
  end
end

Instance Method Details

#build_rdf(document, subject) ⇒ Object 



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# File 'app/models/note/skos/base.rb', line 50

def build_rdf(document, subject)
  if annotations.any?
    subject.send(rdf_namespace).build_predicate(rdf_predicate) do |blank_node|
      blank_node.Rdfs::comment(value, lang: language || nil) if value
      annotations.order(:namespace, :predicate).each do |annotation|
        if IqRdf::Namespace.find_namespace_class(annotation.namespace)
          val = if annotation.value =~ RDFAPI::URI_REGEXP
            # Fall back to plain value literal if URI is not parseable
            URI.parse(annotation.value) rescue annotation.value
          else
            annotation.value
          end
          blank_node.send(annotation.namespace.camelcase).send(annotation.predicate, val, lang: annotation.language || nil)
        else
          raise "#{self.class}#build_rdf: can't find namespace '#{annotation.namespace}' for note annotation '#{annotation.id}'."
        end
      end
    end
  else
    subject.send(rdf_namespace).send(rdf_predicate, value, lang: language)
  end
end