Class: Isbn13DigitValidator

Inherits:
IsbnValidator show all
Defined in:
lib/Isbn13DigitValidator.rb

Constant Summary

Constants inherited from IsbnValidator

IsbnValidator::METHOD_MISSING

Instance Method Summary collapse

Methods inherited from IsbnValidator

#validate

Constructor Details

#initialize(isbn13) ⇒ Isbn13DigitValidator

Returns a new instance of Isbn13DigitValidator.



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# File 'lib/Isbn13DigitValidator.rb', line 6

def initialize(isbn13)
   @isbn = isbn13
end

Instance Method Details

#checkDigit ⇒ Object 



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# File 'lib/Isbn13DigitValidator.rb', line 11

def checkDigit
  @strippedIsbn =  @isbn.gsub(/[^0-9a-z]/i,'')
  if @strippedIsbn.length != 13
    return false
  end

  return true
end

#validateIsbn ⇒ Object 



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# File 'lib/Isbn13DigitValidator.rb', line 21

def validateIsbn
   check = 0
   i = 0
   while i < 12 do
     check = check +  @isbn[i].to_i
     i = i + 2 
    end 
    
    i = 1 
    while i < 12 do
     check = check + 3* @isbn[i].to_i
     i = i + 2 
    end 
    check = check +  @isbn[12].to_i
   return check % 10 == 0;
end