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ParticipationConstraints.java
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ParticipationConstraints.java
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/**
* Copyright (C) 2019 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.model.annotations;
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;
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ParticipationConstraints {
ParticipationConstraint[] value() default {};
/**
* (Optional) Whether the annotated field can be empty, i.e. {@code null} for singular attributes and {@code null}
* or empty for plural attributes (this is up to the implementation).
* <p>
* This attributes corresponds to using a {@link ParticipationConstraint} with {@code min = 1}.
* <p>
* In case there are participation constraints specified as values of this annotation, the {@code nonEmpty} value is
* ignored.
*
* @return Whether the field can be empty
*/
boolean nonEmpty() default false;
}