org.babyfish.jimmer.spring.repository.SpringOrders Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jimmer-spring-boot-starter Show documentation

A revolutionary ORM framework for both java and kotlin

There is a newer version: 0.9.19

Show newest version

package org.babyfish.jimmer.spring.repository;

import org.babyfish.jimmer.meta.TypedProp;
import org.babyfish.jimmer.sql.ast.Expression;
import org.babyfish.jimmer.sql.ast.query.Order;
import org.babyfish.jimmer.sql.ast.table.Props;
import org.springframework.data.domain.Sort;

import java.util.ArrayList;
import java.util.List;

public class SpringOrders {

    private static final TypedProp.Scalar[] EMPTY_PROPS = new TypedProp.Scalar[0];

    private static final Order[] EMPTY_ORDERS = new Order[0];

    private SpringOrders() {}

    public static Order[] toOrders(Props table, Sort sort) {
        if (sort == null || sort.isEmpty()) {
            return EMPTY_ORDERS;
        }
        List astOrders = new ArrayList<>();
        for (Sort.Order order : sort) {
            Expression expr = Order.orderedExpression(table, order.getProperty());
            Order astOrder = order.isDescending() ? expr.desc() : expr.asc();
            switch (order.getNullHandling()) {
                case NULLS_FIRST:
                    astOrder = astOrder.nullsFirst();
                    break;
                case NULLS_LAST:
                    astOrder = astOrder.nullsLast();
                    break;
            }
            astOrders.add(astOrder);
        }
        return astOrders.toArray(EMPTY_ORDERS);
    }
}