Class: BibTeX::Entry::RDFConverter

Inherits:
Object
  • Object
show all
Defined in:
lib/bibtex/entry/rdf_converter.rb

Constant Summary collapse

DEFAULT_REMOVE_FROM_FALLBACK = 
%w(
  bdsk-file-1
  bdsk-file-2
  bdsk-file-3
  bdsk-file-4
).map(&:intern).freeze
BIBO_TYPES = 
Hash[*%w{
  article        Article
  book           Book
  booklet        Book
  collection     Collection
  conference     AcademicArticle
  inbook         BookSection
  incollection   BookSection
  inproceedings  AcademicArticle
  journal        Journal
  manual         Manual
  mastersthesis  Thesis
  online         Website
  patent         Patent
  periodical     Periodical
  phdthesis      Thesis
  proceedings    Proceedings
  standard       Standard
  techreport     Report
  thesis         Thesis
  unpublished    Manuscript
}.map(&:intern)].freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(bibtex, graph = RDF::Graph.new, agent = {}) ⇒ RDFConverter

Returns a new instance of RDFConverter.

Parameters:



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# File 'lib/bibtex/entry/rdf_converter.rb', line 41

def initialize(bibtex, graph = RDF::Graph.new, agent = {})
  @bibtex = bibtex
  @graph = graph
  @agent = agent
end

Class Method Details

.convert(bibtex, graph = RDF::Graph.new, agent = {}) ⇒ RDF::Graph

converts a BibTeX entry to RDF

Returns:

  • (RDF::Graph) —

    the RDF graph of this entry



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# File 'lib/bibtex/entry/rdf_converter.rb', line 36

def self.convert(bibtex, graph = RDF::Graph.new, agent = {})
  new(bibtex, graph, agent).convert!
end

Instance Method Details

#abstract ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 61

def abstract
  return unless bibtex.field?(:abstract)
  remove_from_fallback(:abstract)

  graph << [entry, RDF::DC.abstract, bibtex[:abstract].to_s]
  graph << [entry, bibo[:abstract], bibtex[:abstract].to_s]
end

#annote ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 69

def annote
  return unless bibtex.field?(:annote)
  remove_from_fallback(:annote)

  pub = RDF::Node.new
  graph << [pub, RDF.type, bibo[:Note]]
  graph << [pub, bibo[:content], bibtex[:annote]]

  graph << [entry, bibo[:annotates], pub]
end

#author ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 80

def author
  return unless bibtex.field?(:author)
  remove_from_fallback(:author)

  seq = RDF::Node.new

  graph << [seq, RDF.type, RDF[:Seq]]
  graph << [entry, bibo[:authorList], seq]

  bibtex[:author].each do |name|
    node = agent(name) { create_agent(name, :Person) }

    graph << [entry, RDF::DC.creator, node]
    graph << [seq, RDF.li, node]
  end
end

#bdsk_url ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 97

def bdsk_url
  count = 1
  while bibtex.field?("bdsk-url-#{count}".to_sym) do
    field = "bdsk-url-#{count}".to_sym
    remove_from_fallback(field)
    graph << [entry, RDF::DC.URI, bibtex[field].to_s]
    graph << [entry, bibo[:uri], bibtex[field].to_s]
    count  += 1
  end
end

#booktitle ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 108

def booktitle
  return unless bibtex.field?(:booktitle)
  remove_from_fallback(:booktitle)
  return if bibtex.has_parent? &&
    bibtex.parent[:title] == bibtex[:booktitle]
  return if bibtex.has_parent? &&
    bibtex.parent[:booktitle] == bibtex[:booktitle]
  return if bibtex.has_parent? &&
    bibtex.parent[:isbn] == bibtex[:isbn]
  return if bibtex[:title] == bibtex[:booktitle]

  series = RDF::Node.new
  graph << [series, RDF.type, bibo[:Document]]
  graph << [series, RDF::DC.title, bibtex[:booktitle].to_s]

  graph << [entry, RDF::DC.isPartOf, series]
end

#chapter ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 126

def chapter
  return unless bibtex.field?(:chapter)
  remove_from_fallback(:chapter)

  graph << [entry, bibo[:chapter], bibtex[:chapter].to_s]
end

#children ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 133

def children
  return unless bibtex.has_children?

  bibtex.children.each do |child|
    child_id = RDF::URI.new(child.identifier)
    BibTeX::Entry::RDFConverter.new(child, graph, agent).convert! unless uri_in_graph?(child_id)
    graph << [entry, RDF::DC.hasPart, child_id]
  end
end

#convert! ⇒ RDF::Graph

Returns the RDF graph of this entry.

Returns:

  • (RDF::Graph) —

    the RDF graph of this entry



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# File 'lib/bibtex/entry/rdf_converter.rb', line 48

def convert!
  bibtex.parse_names
  bibtex.parse_month

  unless uri_in_graph?(entry)
    methods = self.class.instance_methods(false) - [:convert!]
    methods.each { |m| send(m) }
    run_fallback
  end

  graph
end

#copyright ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 143

def copyright
  return unless bibtex.field?(:copyright)
  remove_from_fallback(:copyright)

  graph << [entry, RDF::DC.rightsHolder, bibtex[:copyright].to_s]
end

#date_added ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 150

def date_added
  return unless bibtex.field?(:'date-added')
  remove_from_fallback(:'date-added')

  graph << [entry, RDF::DC.created, bibtex[:'date-added'].to_s]
end

#date_modified ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 157

def date_modified
  return unless bibtex.field?(:'date-modified')
  remove_from_fallback(:'date-modified')

  graph << [entry, RDF::DC.modified, bibtex[:'date-modified'].to_s]
end

#doi ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 164

def doi
  return unless bibtex.field?(:doi)
  remove_from_fallback(:doi)

  graph << [entry, bibo[:doi], bibtex[:doi].to_s]
  graph << [entry, RDF::DC.identifier, "doi:#{bibtex[:doi].to_s}"]
end

#edition ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 172

def edition
  return unless bibtex.field?(:edition)
  remove_from_fallback(:edition)

  graph << [entry, bibo[:edition], bibtex[:edition].to_s]
end

#editor ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 179

def editor
  return unless bibtex.field?(:editor)
  remove_from_fallback(:editor)

  seq = RDF::Node.new

  graph << [seq, RDF.type, RDF[:Seq]]
  graph << [entry, bibo[:editorList], seq]

  bibtex[:editor].each do |name|
    node = agent(name) { create_agent(name, :Person) }

    graph << [entry, bibo.name, node]
    graph << [seq, RDF.li, node]
  end
end

#fallback_default ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 196

def fallback_default
  remove_from_fallback(*DEFAULT_REMOVE_FROM_FALLBACK)
end

#howpublished ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 200

def howpublished
  return unless bibtex.field?(:howpublished)
  return unless bibtex[:howpublished] =~ /^#{URI.regexp}$/
  remove_from_fallback(:howpublished)

  graph << [entry, RDF::DC.URI, bibtex[:howpublished].to_s]
  graph << [entry, bibo[:uri], bibtex[:howpublished].to_s]
end

#institution ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 209

def institution
  return unless bibtex.field?(:institution)
  remove_from_fallback(:institution)

  org = agent(bibtex[:institution].to_s) { create_agent(bibtex[:institution].to_s, :Organization) }

  graph << [entry, RDF::DC.contributor, org]
end

#isbn ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 218

def isbn
  return unless bibtex.field?(:isbn)
  remove_from_fallback(:isbn)

  graph << [entry, bibo[:isbn], bibtex[:isbn].to_s]

  if bibtex.contained?
    graph << [entry, RDF::DC.isPartOf, "urn:isbn:#{bibtex[:isbn].to_s}"]
  else
    graph << [entry, RDF::DC.identifier, "urn:isbn:#{bibtex[:isbn].to_s}"]
  end
end

#issn ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 231

def issn
  return unless bibtex.field?(:issn)
  remove_from_fallback(:issn)

  graph << [entry, bibo[:issn], bibtex[:issn].to_s]
  if bibtex.contained?
    graph << [entry, RDF::DC.isPartOf, "urn:issn:#{bibtex[:issn].to_s}"]
  else
    graph << [entry, RDF::DC.identifier, "urn:issn:#{bibtex[:issn].to_s}"]
  end
end

#journal_dc_part_of ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 256

def journal_dc_part_of
  return unless bibtex.field?(:journal)
  return if bibtex.has_parent? && bibtex.parent[:title] == bibtex[:journal]
  return if bibtex.has_parent? && bibtex.parent[:issn] == bibtex[:issn]

  journal = RDF::Node.new
  graph << [journal, RDF.type, bibo[:Journal]]
  graph << [journal, RDF::DC.title, bibtex[:journal].to_s]

  graph << [entry, RDF::DC.isPartOf, journal]
end

#journal_dc_source ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 243

def journal_dc_source
  return unless bibtex.field?(:journal)
  remove_from_fallback(:journal)

  source = []
  source << bibtex[:journal].to_s
  source << "Vol. #{bibtex[:volume].to_s}" if bibtex.field?(:volume)
  source << "No. #{bibtex[:number].to_s}" if bibtex.field?(:number)
  pagination = bibtex[:pagination] || 'pp.'
  source << "#{pagination.to_s} #{bibtex[:pages].to_s}" if bibtex.field?(:pages)
  graph << [entry, RDF::DC.source, source.join(', ')]
end

#key ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 268

def key
  graph << [entry, RDF::DC.identifier, "urn:bibtex:#{bibtex.key}"]
end

#keywords ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 272

def keywords
  return unless bibtex.field?(:keywords)
  remove_from_fallback(:keywords)

  bibtex[:keywords].to_s.split(/\s*[,;]\s*/).each do |keyword|
    graph << [entry, RDF::DC.subject, keyword]
  end
end

#language ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 281

def language
  return unless bibtex.field?(:language)
  remove_from_fallback(:language)

  bibtex[:language] = 'german' if bibtex[:language] == 'ngerman'

  graph << [entry, RDF::DC.language, bibtex[:language].to_s]
end

#lccn ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 301

def lccn
  return unless bibtex.field?(:lccn)
  remove_from_fallback(:lccn)

  graph << [entry, bibo[:lccn], bibtex[:lccn].to_s]
end

#location ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 290

def location
  return unless bibtex.field?(:location)
  remove_from_fallback(:location)

  graph << [entry, RDF::DC.Location, bibtex[:location].to_s]
  if [:proceedings, :inproceedings, :conference].include?(bibtex.type)
    event = RDF::Vocabulary.new('http://purl.org/NET/c4dm/event.owl')
    graph << [entry, event[:place], org]
  end
end

#note ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 308

def note
  return unless bibtex.field?(:note)
  remove_from_fallback(:note)

  pub = RDF::Node.new
  graph << [pub, RDF.type, bibo[:Note]]
  graph << [pub, bibo[:content], bibtex[:note]]

  graph << [entry, bibo[:annotates], pub]
end

#number ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 319

def number
  return unless bibtex.field?(:number)
  remove_from_fallback(:number)

  case bibtex.type
  when :techreport || :manual || :unpublished
    graph << [entry, bibo[:number], bibtex[:number].to_s]
  else
    graph << [entry, bibo[:issue], bibtex[:number].to_s]
  end
end

#organization ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 331

def organization
  return unless bibtex.field?(:organization)
  remove_from_fallback(:organization)

  org = agent(bibtex[:organization].to_s) { create_agent(bibtex[:organization].to_s, :Organization) }

  graph << [entry, RDF::DC.contributor, org]
  graph << [entry, bibo[:organizer], org] if [:proceedings, :inproceedings, :conference].include?(bibtex.type)
end

#pages ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 341

def pages
  return unless bibtex.field?(:pages)
  remove_from_fallback(:pages)

  if bibtex[:pages].to_s =~ /^\s*(\d+)\s*-+\s*(\d+)\s*$/
    graph << [entry, bibo[:pageStart], Regexp.last_match[1]]
    graph << [entry, bibo[:pageEnd], Regexp.last_match[2]]
  else
    graph << [entry, bibo[:pages], bibtex[:pages].to_s]
  end
end

#pagetotal ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 353

def pagetotal
  return unless bibtex.field?(:pagetotal)
  remove_from_fallback(:pagetotal)

  graph << [entry, bibo[:numPages], bibtex[:pagetotal].to_s]
end

#parent ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 360

def parent
  return unless bibtex.has_parent?
  remove_from_fallback(:crossref)

  parent_id = RDF::URI.new(bibtex.parent.identifier)
  BibTeX::Entry::RDFConverter.new(bibtex.parent, graph, agent).convert! unless uri_in_graph?(parent_id)
  graph << [entry, RDF::DC.isPartOf, parent_id]
end

#publisher ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 369

def publisher
  return unless bibtex.field?(:publisher, :organization, :school, :institution)
  remove_from_fallback(:publisher, :address)

  org =
    case
    when bibtex.field?(:publisher)
      agent(bibtex[:publisher].to_s) { create_agent(bibtex[:publisher].to_s, :Organization) }
    when bibtex.field?(:organization)
      agent(bibtex[:organization].to_s) { create_agent(bibtex[:organization].to_s, :Organization) }
    when bibtex.field?(:school)
      agent(bibtex[:school].to_s) { create_agent(bibtex[:school].to_s, :Organization) }
    when bibtex.field?(:institution)
      agent(bibtex[:institution].to_s) { create_agent(bibtex[:institution].to_s, :Organization) }
    end

  if bibtex.field?(:address)
    address = RDF::Vocabulary.new('http://schemas.talis.com/2005/address/schema#')
    graph << [org, address[:localityName], bibtex[:address]]
  end

  graph << [entry, RDF::DC.publisher, org]
  graph << [entry, bibo[:publisher], org]
end

#school ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 394

def school
  return unless bibtex.field?(:school)
  remove_from_fallback(:school)

  org = agent(bibtex[:school].to_s) { create_agent(bibtex[:school].to_s, :Organization) }

  graph << [entry, RDF::DC.contributor, org]
end

#series ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 403

def series
  return unless bibtex.field?(:series)
  remove_from_fallback(:series)
  return if bibtex.has_parent? && bibtex.parent[:title] == bibtex[:series]
  return if bibtex.has_parent? && bibtex.parent[:series] == bibtex[:series]
  return if bibtex.has_parent? && bibtex.parent[:issn] == bibtex[:issn]

  series = RDF::Node.new
  graph << [series, RDF.type, bibo[:MultiVolumeBook]]
  graph << [series, RDF::DC.title, bibtex[:series].to_s]

  graph << [entry, RDF::DC.isPartOf, series]
end

#thesis_degree ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 417

def thesis_degree
  return unless bibo_class == :Thesis

  degree =
    case bibtex.type
    # ms = masters degree in science
    # Only ma and ms available. We simply chose one.
    when :mastersthesis then bibo['degrees/ms']
    when :phdthesis then bibo['degrees/phd']
    end

  degree =
    case bibtex[:type]
    when 'mathesis' then bibo['degrees/ma']
    when 'phdthesis' then bibo['degrees/phd']
    when /Dissertation/i then bibo['degrees/phd']
    when /Bachelor['s]{0,2} Thesis/i then "Bachelor's Thesis"
    when /Diplomarbeit/i then bibo['degrees/ms']
    when /Magisterarbeit/i then bibo['degrees/ma']
    else degree
    end

  unless degree.nil?
    remove_from_fallback(:type)
    graph << [entry, bibo[:degree], degree]
  end
end

#title ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 445

def title
  return unless bibtex.field?(:title)
  remove_from_fallback(:title)

  title = [bibtex[:title].to_s, bibtex[:subtitle].to_s]
    .reject { |t| t.nil? || t.empty? }
    .join(': ')
  graph << [entry, RDF::DC.title, title]
  graph << [entry, bibo[:shortTitle], bibtex[:title].to_s] if bibtex.field?(:subtitle)
end

#translator ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 456

def translator
  return unless bibtex.field?(:translator)
  remove_from_fallback(:translator)

  node = agent(bibtex[:translator].to_s) do
    create_agent(bibtex[:translator].to_s, :Person)
  end

  graph << [entry, RDF::DC.contributor, node]
  graph << [entry, bibo[:translator], node]
end

#type ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 468

def type
  graph << [entry, RDF.type, bibo[bibo_class]]

  case bibtex.type
  when :proceedings, :journal
    graph << [entry, RDF::DC.type, 'Collection']
  else
    graph << [entry, RDF::DC.type, 'Text']
  end
end

#url ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 479

def url
  return unless bibtex.field?(:url)
  remove_from_fallback(:url)

  graph << [entry, RDF::DC.URI, bibtex[:url].to_s]
  graph << [entry, bibo[:uri], bibtex[:url].to_s]
end

#volume ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 487

def volume
  return unless bibtex.field?(:volume)
  remove_from_fallback(:volume)

  graph << [entry, bibo[:volume], bibtex[:volume].to_s]
end

#volumes ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 494

def volumes
  return unless bibtex.field?(:volumes)
  remove_from_fallback(:volumes)

  graph << [entry, bibo[:numVolumes], bibtex[:volumes].to_s]
end

#year ⇒ Object 



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# File 'lib/bibtex/entry/rdf_converter.rb', line 501

def year
  return unless bibtex.field?(:year)
  remove_from_fallback(:year, :month)

  year = bibtex[:year].to_s
  if bibtex.field?(:month)
    month = BibTeX::Entry::MONTHS.find_index(bibtex[:month].to_s.intern)
    month += 1 unless month.nil?
  end
  date = month.nil? ? year : [year, month].join('-')

  graph << [entry, RDF::DC.issued, date]
end