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Visa.java

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package net.threebit.utils.sosc ; 

public class Visa extends CreditCard
{  
    public Visa(final String visa)
    {        
        super(visa, "Visa");
    }

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

    protected boolean checkSize()
    {                
        return((13 == (number.length())) || (16 == (number.length())));
    }
    
    protected boolean checkPrefix()
    {
        final int prefix;
        prefix = (number.charAt(0) - '0'); 
        return (prefix == 4);
    }
    
    public static boolean validate(String num)
    {
         return(new Visa(num).validate());
    }
}

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