Class: Isbn10To13DigitConverter

Inherits:
Object
  • Object
show all
Defined in:
lib/Isbn10To13DigitConverter.rb

Instance Method Summary collapse

Constructor Details

#initialize(isbn) ⇒ Isbn10To13DigitConverter

Returns a new instance of Isbn10To13DigitConverter.



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# File 'lib/Isbn10To13DigitConverter.rb', line 6

def initialize(isbn)
  @isbn = isbn
end

Instance Method Details

#convert(isbn10) ⇒ Object 



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# File 'lib/Isbn10To13DigitConverter.rb', line 28

def convert (isbn10)
 isbn10ToIsbn13(isbn10)
end

#getIsbn13CheckSum(isbn13) ⇒ Object 



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# File 'lib/Isbn10To13DigitConverter.rb', line 46

def  getIsbn13CheckSum(isbn13)
  sum = 0
  isbnFactorPattern = [1,3,1,3,1,3,1,3,1,3,1,3]
  for i in 0..11
    sum = sum + isbnFactorPattern[i] *  isbn13[i].to_i
  end
  value = sum % 10
  lastDigitIsbn = 10 - value 
  return lastDigitIsbn  
end

#isbn10ToIsbn13(isbn10) ⇒ Object

The method to convert an 10 digit ISBN to 13 digit The method takes a 10 digit isbn and append “978” to the first 9 characters of the isbn and generate the 13 digit



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# File 'lib/Isbn10To13DigitConverter.rb', line 35

def isbn10ToIsbn13(isbn10) 
  
  if isbn10.length() !=10
    raise "The argument length should be 10"
  end
  
  isbn13 = "978" + isbn10.chomp("-");
  return isbn13.slice(0, isbn13.length()-1) + getIsbn13CheckSum(isbn13).to_s;
end

#process ⇒ Object 



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# File 'lib/Isbn10To13DigitConverter.rb', line 15

def process

 @strippedIsbn =  @isbn.gsub(/[^0-9a-z]/i,'')
 
 if( @strippedIsbn.length() == 10 )
    return convert(@strippedIsbn)
  else (@strippedIsbn.length() == 13 )
     @isbn13To10Converter.process
  end

end

#set13To10DigitConverter(isbn13To10Converter) ⇒ Object 



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# File 'lib/Isbn10To13DigitConverter.rb', line 10

def set13To10DigitConverter(isbn13To10Converter)
  @isbn13To10Converter = isbn13To10Converter
end