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import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import javax.annotation.MatchesPattern;
import javax.annotation.meta.TypeQualifier;
import javax.annotation.meta.TypeQualifierValidator;
import javax.annotation.meta.When;
@Documented
@TypeQualifier
@MatchesPattern("[0-9]{16}")
@Retention(RetentionPolicy.RUNTIME)
public @interface CreditCardNumber {
class Checker implements TypeQualifierValidator<CreditCardNumber> {
public When forConstantValue(CreditCardNumber annotation, Object v) {
if (!(v instanceof String))
return When.NEVER;
String s = (String) v;
if (LuhnVerification.checkNumber(s))
return When.ALWAYS;
return When.NEVER;
}
}
}
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