CheckDigitValidator::calculateCheckDigit()
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<?php
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declare(strict_types = 1);
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namespace byrokrat\banking\Validator;
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use byrokrat\banking\AccountNumber;
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/**
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 * Validate check digits
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 */
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abstract class CheckDigitValidator implements ValidatorInterface
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{
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    public function validate(AccountNumber $number): ResultInterface
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    {
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        if ($number->getCheckDigit() === '' || $number->getSerialNumber() === '') {
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            return new Failure('Unable to validate checkdigit, not enough digits');
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        }
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        $expected = $this->calculateCheckDigit($number);
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        if ($number->getCheckDigit() == $expected) {
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            return new Success("Valid check digit $expected");
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        }
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        return new Failure("Invalid check digit {$number->getCheckDigit()}, expected $expected");
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    }
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    /**
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     * Calculate the expected checkdigit
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     */
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    abstract protected function calculateCheckDigit(AccountNumber $number): string;
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}
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