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/*
 * Hibernate Validator, declare and validate application constraints
 *
 * License: Apache License, Version 2.0
 * See the license.txt file in the root directory or .
 */
package org.hibernate.validator.constraints;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.TYPE_USE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Documented;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import jakarta.validation.Constraint;
import jakarta.validation.Payload;

import org.hibernate.validator.constraints.LuhnCheck.List;

/**
 * Luhn algorithm check constraint.
 * 

* Allows to validate that a series of digits pass the Luhn Modulo 10 checksum * algorithm. The Luhn Mod10 is calculated by summing up the digits, with every odd * digit (from right to left) value multiplied by 2, if the value is greater than 9 the * the result digits a summed before the total summing. *

*

* The supported type is {@code CharSequence}. {@code null} is considered valid. *

* * @author George Gastaldi * @author Hardy Ferentschik * @author Victor Rezende dos Santos */ @Documented @Constraint(validatedBy = { }) @Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE }) @Retention(RUNTIME) @Repeatable(List.class) public @interface LuhnCheck { String message() default "{org.hibernate.validator.constraints.LuhnCheck.message}"; Class[] groups() default { }; Class[] payload() default { }; /** * @return the start index (inclusive) for calculating the checksum. If not specified 0 is assumed. */ int startIndex() default 0; /** * @return the end index (inclusive) for calculating the checksum. If not specified the whole value is considered. */ int endIndex() default Integer.MAX_VALUE; /** * @return The index of the check digit in the input. Per default it is assumed that the check digit is the last * digit of the specified range. If set, the digit at the specified index is used. If set * the following must hold true: * {@code checkDigitIndex > 0 && (checkDigitIndex < startIndex || checkDigitIndex >= endIndex}. */ int checkDigitIndex() default -1; /** * @return Whether non-digit characters in the validated input should be ignored ({@code true}) or result in a * validation error ({@code false}). */ boolean ignoreNonDigitCharacters() default true; /** * Defines several {@code @LuhnCheck} annotations on the same element. */ @Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE }) @Retention(RUNTIME) @Documented public @interface List { LuhnCheck[] value(); } }




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