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