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Following the DRY (Don't Repeat Yourself) principle, Hibernate Validator let's you express your domain constraints once (and only once) and ensure their compliance at various level of your system automatically.

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//$Id: Digits.java 15133 2008-08-20 10:05:57Z hardy.ferentschik $
package org.hibernate.validator;

import java.lang.annotation.ElementType;
import java.lang.annotation.Target;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * Check that a given number has integerDigits integer digits
 * and fractionalDigits fractional digits
 * The constraints are defined at the database level too
 *
 * @author Norman Richards
 */
@ValidatorClass(DigitsValidator.class)
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention( RetentionPolicy.RUNTIME)
@Documented
public @interface Digits {
    int integerDigits();
    int fractionalDigits() default 0;
    String message() default "{validator.digits}";
}