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package beanvalidation.constraints;
import java.util.regex.Pattern;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
/**
* Valid a credit card number using the standard LUHN check. Implementation borrowed from Mojarra's
* CreditCardValidator.
*/
public class CreditCardConstraintValidator
implements ConstraintValidator<CreditCard, String> {
private Pattern basicSyntaxPattern;
public void initialize(CreditCard parameters) {
basicSyntaxPattern = Pattern.compile("^[0-9\\ \\-]*$");
}
public boolean isValid(String value, ConstraintValidatorContext ctxt) {
if (value == null || value.length() == 0) {
return true;
}
if (!basicSyntaxPattern.matcher(value).matches()) {
return false;
}
return luhnCheck(stripNonDigits(value));
}
private String stripNonDigits(String s) {
return s.replaceAll(" ", "").replaceAll("-", "");
}
private boolean luhnCheck(String number) {
int sum = 0;
boolean timestwo = false;
for (int i = number.length() - 1; i >= 0; i--) {
int n = Integer.parseInt(number.substring(i, i + 1));
if (timestwo) {
n *= 2;
if (n > 9) {
n = (n % 10) + 1;
}
}
sum += n;
timestwo = !timestwo;
}
return sum % 10 == 0;
}
}