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Kiwi is a utility library. We really like Google's Guava, and also use Apache Commons. But if they don't have something we need, and we think it is useful, this is where we put it.

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package org.kiwiproject.validation;

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 javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * The annotated element must have a value that can be converted to a Java long or {@link java.lang.Long}.
 */
@Documented
@Constraint(validatedBy = LongValueValidator.class)
@Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE})
@Retention(RetentionPolicy.RUNTIME)
public @interface LongValue {

    String message() default "{org.kiwiproject.validation.LongValue.message}";

    Class[] groups() default {};

    Class[] payload() default {};

    /**
     * Whether to consider null as valid. The default is false.
     *
     * @return true to consider null as valid
     */
    boolean allowNull() default false;
}