Class: Iqvoc::SkosImporter

Inherits:
Object
  • Object
show all
Defined in:
lib/iqvoc/skos_importer.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(object, default_namespace_url, logger = Rails.logger, publish = true, verbose = false) ⇒ SkosImporter 



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# File 'lib/iqvoc/skos_importer.rb', line 23

def initialize(object, default_namespace_url, logger = Rails.logger, publish = true, verbose = false)
  @file = case object
            when File
              File.open(object)
            when Array
              object
            else
              open(object)
          end

  @default_namespace_url = default_namespace_url
  @publish = publish
  @verbose = verbose
  @logger = logger

  unless @file.is_a?(File) || @file.is_a?(Array)
    raise "Iqvoc::SkosImporter#import: Parameter 'file' should be a File or an Array."
  end

  # Some general Namespaces to support in any case
  @prefixes = {
    'http://www.w3.org/2004/02/skos/core#' => 'skos:',
    'http://www.w3.org/2008/05/skos#' => 'skos:',
    'http://www.w3.org/1999/02/22-rdf-syntax-ns#' => 'rdf:',
    default_namespace_url => ':'
  }
  # Add the namespaces specified in the Iqvoc config
  Iqvoc.rdf_namespaces.each do |pref, uri|
    @prefixes[uri] = "#{pref.to_s}:"
  end

  @seen_first_level_objects = {} # Concept cache (don't load any concept twice from db)

  # Assign the default concept scheme singleton instance as a seen first level object upfront
  # in order to handle a missing scheme definition in ntriple data
  @seen_first_level_objects[Iqvoc::Concept.root_class.instance.origin] = Iqvoc::Concept.root_class

  @new_subjects = {} # Concepts, collections, labels etc. to be published later

  # Triples the importer doesn't understand immediately. Example:
  #
  #     :a skos:prefLabel "foo". # => What is :a? Remember this and try again later
  #     ....
  #     :a rdf:type skos:Concept # => Now I know :a, good I remembered it's prefLabel...
  @unknown_second_level_triples = Set.new

  # Hash of arrays of arrays: { "_:n123" => [["pred1", "obj1"], ["pred2", "obj2"]] }
  @blank_nodes = {}

  @existing_origins = {} # To prevent the creation of first level objects we already have
  first_level_object_classes.each do |klass|
    klass.select('origin').load.each do |thing|
      @existing_origins[thing.origin] = klass
    end
  end
end

Class Method Details

.prepend_first_level_object_classes(args) ⇒ Object 



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# File 'lib/iqvoc/skos_importer.rb', line 19

def self.prepend_first_level_object_classes(args)
  self.first_level_object_classes.unshift(*args)
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/iqvoc/skos_importer.rb', line 80

def run
  import @file
end