Class: Identifier::Global::Lccn

Inherits:
Identifier::Global show all
Defined in:
app/models/identifier/global/lccn.rb

Overview

TODO:

This validation will be needing a lot of additional work, if we start relying on it. See http://www.loc.gov/marc/bibliographic/bd010.html

LCCN Structure A (1898-2000) Name of Element Number of characters Character position in field Alphabetic prefix 3 00-02 Year 2 03-04 Serial number 6 05-10 Supplement number 1 11 Suffix and/or Revision Date variable 12-n

LCCN Structure B (2001- ) Name of Element Number of characters Character position in field Alphabetic prefix 2 00-01 Year 4 02-05 Serial number 6 06-11

Alphabetic prefix Prefixes are carried in a MARC record as lowercase alphabetic characters and serve to differentiate between different series of LC control numbers. Prefixes are left justified and unused positions contain blanks. If no prefix is present, the prefix portion contains blanks.

Constant Summary

Constants included from SoftValidation

SoftValidation::ANCESTORS_WITH_SOFT_VALIDATIONS

Instance Attribute Summary

Attributes inherited from Identifier::Global

#relation

Instance Method Summary collapse

Methods inherited from Identifier::Global

#build_cached, #dwc_occurrences, #is_global?, #sv_resolves?

Methods included from SoftValidation

#clear_soft_validations, #fix_for, #fix_soft_validations, #soft_fixed?, #soft_valid?, #soft_validate, #soft_validated?, #soft_validations, #soft_validators

Instance Method Details

#using_iccn_class ⇒ Object 



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# File 'app/models/identifier/global/lccn.rb', line 25

def using_iccn_class
  unless identifier.nil?
    lccn = identifier

    # '200112345', '2010549727', '2003064850', '|a  2003064850', '88156495', '68-004897', '2001-459440'

    #   LCCN Structure A (1898-2000)
    /^(?<preamble_a>.{3}){0,1}(?<year_a>\d{2})-{0,1}(?<serial_a>\d{6})(?<supplement>\d){0,1}(?<suffix>.*)$/i =~ lccn
    #   LCCN Structure B (2001- )
    # this regex should be good for all of the third millennium
    /^(?<preamble_b>.{2}){0,1}(?<year_b>\d{4})-{0,1}(?<serial_b>\d{6})$/i =~ lccn

    century = '19'
    unless year_a.nil?
      serial = serial_a.to_i
      case year_a
        when '98'
          if serial < 3000
            century = '18'
          end
        when '99'
          if serial < 6000
            century = '18'
          end
        when '00'
          if serial >= 8000
            century = '20'
          end
      end
      year = century + year_a
      return
    end

    return unless (year_b.nil? or serial_b.nil?)

    unless year_b.nil?
      year = year_b.to_i
      if (year > Time.now.year) or (year < 2001)
        errors.add(:identifier, "'#{identifier}' is too far in the future, or before 2001.")
        return
      end
    else
      if serial_b.nil?
        errors.add(:identifier, "'#{identifier}' is an improperly formed LCCN.")
        return
      end
    end
  end
end