Module: Sufia::GenericFile::Characterization

Extended by:
ActiveSupport::Concern
Included in:
Sufia::GenericFile
Defined in:
lib/sufia/models/generic_file/characterization.rb

Instance Method Summary collapse

Instance Method Details

#append_metadata ⇒ Object

Populate descMetadata with fields from FITS (e.g. Author from pdfs)



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# File 'lib/sufia/models/generic_file/characterization.rb', line 58

def append_metadata
  terms = self.characterization_terms
  Sufia.config.fits_to_desc_mapping.each_pair do |k, v|
    if terms.has_key?(k)
      # coerce to array to remove a conditional
      terms[k] = [terms[k]] unless terms[k].is_a? Array
      terms[k].each do |term_value|
        proxy_term = self.send(v)
        if proxy_term.kind_of?(Array)
          proxy_term << term_value unless proxy_term.include?(term_value)
        else
          # these are single-valued terms which cannot be appended to
          self.send("#{v}=", term_value)
        end
      end
    end
  end
end

#characterization_terms ⇒ Object 



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# File 'lib/sufia/models/generic_file/characterization.rb', line 77

def characterization_terms
  h = {}
  self.characterization.class.terminology.terms.each_pair do |k, v|
    next unless v.respond_to? :proxied_term
    term = v.proxied_term
    begin
      value = self.send(term.name)
      h[term.name] = value unless value.empty?
    rescue NoMethodError
      next
    end
  end
  h
end

#characterize ⇒ Object

Extract the metadata from the content datastream and record it in the characterization datastream



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# File 'lib/sufia/models/generic_file/characterization.rb', line 50

def characterize
  self.characterization.ng_xml = self.content.extract_metadata
  self.append_metadata
  self.filename = self.label
  save
end

#characterize_if_changed ⇒ Object 



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# File 'lib/sufia/models/generic_file/characterization.rb', line 43

def characterize_if_changed
  content_changed = self.content.changed?
  yield
  Sufia.queue.push(CharacterizeJob.new(self.pid)) if content_changed
end

#duration ⇒ Object 



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# File 'lib/sufia/models/generic_file/characterization.rb', line 35

def duration
  characterization.duration.blank? ? characterization.video_duration : characterization.duration
end

#height ⇒ Object 



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# File 'lib/sufia/models/generic_file/characterization.rb', line 31

def height
  characterization.height.blank? ? characterization.video_height : characterization.height
end

#sample_rate ⇒ Object 



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# File 'lib/sufia/models/generic_file/characterization.rb', line 39

def sample_rate
  characterization.sample_rate.blank? ? characterization.video_sample_rate : characterization.sample_rate
end

#width ⇒ Object 



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# File 'lib/sufia/models/generic_file/characterization.rb', line 27

def width
  characterization.width.blank? ? characterization.video_width : characterization.width
end