Class: OverdriveMetadata::ERecord

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

Direct Known Subclasses

EAudioBook, EBook

Constant Summary collapse

GMD = 
'[electronic resource]'
DATE_ERR = 
'Date information not present for fixed field'
FIXF_ERR = 
'Invalid fixed field created'
TITL_ERR = 
'Title data is missing for record'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ERecord

Returns a new instance of ERecord.



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# File 'lib/overdrive_metadata.rb', line 203

def initialize
  @record = MARC::Record.new
  @ldr = record.leader
  @ldr[5]  = 'n'
  @ldr[7]  = 'm'
  @ldr[17] = 'M'
  @ldr[18] = 'a'
  @fixed_field = ''
end

Instance Attribute Details

#record ⇒ Object (readonly)

Returns the value of attribute record.



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# File 'lib/overdrive_metadata.rb', line 201

def record
  @record
end

Instance Method Details

#make_control_field(tag, value) ⇒ Object 



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# File 'lib/overdrive_metadata.rb', line 213

def make_control_field(tag, value)
  return nil if value.empty?
  @record.append MARC::ControlField.new(tag, value)
end

#make_data_field(tag, ind1, ind2, subfields) ⇒ Object 



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# File 'lib/overdrive_metadata.rb', line 218

def make_data_field(tag, ind1, ind2, subfields)
  s = []
  subfields.each do |k,v|
    return nil if v.nil? or v.empty?
    s << MARC::Subfield.new(k, v)
  end
  @record.append MARC::DataField.new(tag, ind1, ind2, *s)
end

#make_fixed_field(year, month, day) ⇒ Object

Raises:



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# File 'lib/overdrive_metadata.rb', line 227

def make_fixed_field(year, month, day)
  raise DATE_ERR if year.empty?
  fixed_field = @fixed_field
  unless month.empty? and day.empty?
    month = '0' + month if month.length == 1
    day   = '0' + day if day.length == 1
    fixed_field[0..5] = year[2..3] + month + day
    fixed_field[7..10] = year
  else
    fixed_field[7..10] = year
  end
  raise FIXF_ERR unless fixed_field.length == 40
  make_control_field('008', fixed_field)
end

#make_publication(place, publisher, year) ⇒ Object 



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# File 'lib/overdrive_metadata.rb', line 258

def make_publication(place, publisher, year)
  return nil if place.empty? or publisher.empty? or year.empty?
  make_data_field('260', ' ', ' ', {'a' => "#{place} :", 'b' => "#{publisher},", 'c' => "#{year}."})
end

#make_title(title, sor) ⇒ Object

Raises:



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# File 'lib/overdrive_metadata.rb', line 242

def make_title(title, sor)
  raise TITL_ERR if title.empty?
    t_ind1  = sor.empty? ? '0' : '1'
    t_ind2  = non_filing_characters title
    subfields = {}
    subfields['a'] = title
    subfields['h'] = GMD + ' /'
    unless sor.empty?
      value = sor[-1] == '.' ? "by #{sor}" : "by #{sor}."
      subfields['c'] = value
    else
      subfields['h'].gsub!(/\s+\/$/, '.')
    end
    make_data_field('245', t_ind1, t_ind2, subfields)
end

#non_filing_characters(title) ⇒ Object 



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# File 'lib/overdrive_metadata.rb', line 263

def non_filing_characters(title)
  return case
  when title.match(/^The /)
      '4'
  when title.match(/^An /)
      '3'
  when title.match(/^A /)
      '2'     
  else
      '0'
  end
end