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the base moudle of ibankapp series

There is a newer version: 1.0.0-beta.6

/*
 * iBankApp
 *
 * License : Apache License,Version 2.0, January 2004
 *
 * See the LICENSE file in English or LICENSE.zh_CN in chinese
 * in the root directory or .
 */

package org.ibankapp.base.persistence.util;

import org.ibankapp.base.persistence.domain.Sort;

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

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.Order;
import javax.persistence.criteria.Root;

/**
 * 查询应用类
 *
 * @author ibankapp
 * @author codelder
 * @since 1.0.0
 */
public class QueryUtils {

    /**
     * 根据排序规则获取Jpa Order对象集合
     *
     * @param sort 排序规则对象
     * @param root 实体类ROOT
     * @param cb   查询构建器
     * @return Jpa Order对象集合
     */
    public static List toOrders(Sort sort, Root root, CriteriaBuilder cb) {

        List orders = new ArrayList();

        if (sort == null) {
            return orders;
        }


        for (Sort.Order order : sort) {
            orders.add(toJpaOrder(order, root, cb));
        }

        return orders;
    }

    /**
     * 根据排序规则获取JPA Order对象
     *
     * @param order 排序对象中的Order对象
     * @param root  实体类ROOT
     * @param cb    查询构建器
     * @return Jpa Order对象
     */
    private static Order toJpaOrder(org.ibankapp.base.persistence.domain.Sort.Order order, Root root,
                                    CriteriaBuilder cb) {
        return order.isAscending() ? cb.asc(root.get(order.getProperty())) : cb.desc(root.get(order.getProperty()));
    }
}