pulibrary / bibdata / f04bc944-f9b4-4a42-8b26-dcacd0e3e688

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42.31
/marc_to_solr/lib/language_extractor.rb
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# A class to pull out language information from
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# a MARC record
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class LanguageExtractor
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  def initialize(marc_record)
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    @marc_record = marc_record
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  end
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  def all_language_codes




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    all_041_codes.append(fixed_field_code).compact.uniq




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  end










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  def possible_language_subject_headings




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    @marc_record.fields('650')




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                .select { |field| field['v']&.match(/^texts/i) }




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                .map { |field| field['a'] }




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  end










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  def fixed_field_code




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    value = @marc_record['008']&.value




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    fixed_field_code = value ? value[35, 3] : nil




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  end










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  def iso_041_fields




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    all_041_fields.select { |field| field['2'] == 'iso639-3' }




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  end










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  def all_041_fields




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    @marc_record.fields('041')




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  end










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  def iso_041_codes




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    return [] unless iso_041_fields.any?




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    extract_from_multiple_041s(iso_041_fields)




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  end










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  def all_041_codes




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    return [] unless all_041_fields.any?




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    extract_from_multiple_041s(all_041_fields)




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  end










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  private




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    def extract_from_multiple_041s(fields)




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      fields.map do |field|




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        field.subfields.select { |sf| %(a d).include? sf.code }




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             .map(&:value)










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      end.flatten










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    end










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end
























    

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