top.openyuan.jpa.specification.handler.impl.IsNullPredicateHandler Maven / Gradle / Ivy

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package top.openyuan.jpa.specification.handler.impl;

import top.openyuan.jpa.specification.annotation.IsNull;
import top.openyuan.jpa.specification.handler.AbstractPredicateHandler;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.From;
import javax.persistence.criteria.Predicate;
import java.lang.annotation.Annotation;

/**
 * 构建“是 NULL 条件”({@code field IS NULL})场景的 {@link Predicate} 处理器.
 *
 * @author lzy
 * @since v1.0.0
 */
public class IsNullPredicateHandler extends AbstractPredicateHandler {

    @Override
    public Class getAnnotation() {
        return IsNull.class;
    }

    @Override
    public  Predicate buildPredicate(
            CriteriaBuilder criteriaBuilder, From from, String name, Object value, Annotation annotation) {
        return criteriaBuilder.and(super.buildIsNullPredicate(criteriaBuilder, from, value));
    }

}