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• Unique.java

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io.axway.iron.description.Unique Maven / Gradle / Ivy

package io.axway.iron.description;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.annotation.*;
import io.axway.iron.error.UniqueConstraintViolationException;

/**
 * This annotation can be used on entity members to declare a unique constraint. So two distinct entity instances cannot have the same value for the member
 * declared as a unique constraint.

 * For {@link Nullable} members, the {@code null} value is not considered for the unique constraint, so many entity instance can have a {@code null} value for this member.

 * Unique constraints are enforced at modification time, in case of unique constraint violation a {@link UniqueConstraintViolationException} is thrown.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@Documented
public @interface Unique {
}