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ISBN.java

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package net.threebit.utils.sosc ; 

public class ISBN extends Validatable
{   
    public ISBN(final String isbn)
    {
        super(isbn, "ISBN");
    }

        public boolean equals(Object o)
    {
       if (!(o instanceof ISBN))
       {
           return (false);
       }
       return (super.equals(o));
    }

    protected boolean checkDigits(final int[] digits)
    {
        int sum;

        sum = 0;                       

        for(int i = 0; i < (number.length() - 1); i++)
        {
            sum += digits[i] * (i + 1);
        }
                    
        if ((sum % 11) == digits[number.length() - 1])
        {
            return(true);
        }
        return (false);
    }
    
    public static boolean validate(String num)
    {             
        return (new ISBN(num).validate());
    }
    
    protected boolean checkSize()
    {
        return (10 == number.length());
    }
}

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