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Artoria is a java technology framework based on the facade pattern.
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package artoria.util;

import artoria.common.PageResult;
import artoria.common.Paging;
import artoria.data.bean.BeanUtils;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;

import java.util.List;

/**
 * Paging tools.
 * @author Kahle
 */
public class PagingUtils {

    public static void startPage(int pageNum, int pageSize) {

        PagingUtils.startPage(new Paging(pageNum, pageSize));
    }

    public static void startPage(Paging paging) {

        PagingUtils.startPage(paging, true, null);
    }

    public static void startPage(Paging paging, boolean doCount) {

        PagingUtils.startPage(paging, doCount, null);
    }

    public static void startPage(Paging paging, String orderBy) {

        PagingUtils.startPage(paging, true, orderBy);
    }

    public static void startPage(Paging paging, boolean doCount, String orderBy) {
        if (paging == null) { return; }
        Integer pageSize = paging.getPageSize();
        Integer pageNum = paging.getPageNum();
        Assert.notNull(pageSize, "Parameter \"pageSize\" must not null. ");
        Assert.notNull(pageNum, "Parameter \"pageNum\" must not null. ");
        PageHelper.startPage(pageNum, pageSize, doCount);
        if (StringUtils.isNotBlank(orderBy)) {
            PageHelper.orderBy(orderBy);
        }
    }

    public static  PageResult> handleResult(List data) {
        if (data == null) {
            return new PageResult>();
        }
        if (!(data instanceof Page)) {
            return new PageResult>(data);
        }
        Page page = (Page) data;
        PageResult> result = new PageResult>();
        result.setPageNum(page.getPageNum());
        result.setPageSize(page.getPageSize());
        result.setPageCount(page.getPages());
        result.setTotal(page.getTotal());
        result.setData(data);
        return result;
    }

    public static  PageResult> handleResult(List data, Class clazz) {
        if (data == null) {
            return new PageResult>();
        }
        List list = BeanUtils.beanToBeanInList(data, clazz);
        if (!(data instanceof Page)) {
            return new PageResult>(list);
        }
        Page page = (Page) data;
        PageResult> result = new PageResult>();
        result.setPageNum(page.getPageNum());
        result.setPageSize(page.getPageSize());
        result.setPageCount(page.getPages());
        result.setTotal(page.getTotal());
        result.setData(list);
        return result;
    }

    public static  PageResult> handleResult(PageResult> data, Class clazz) {
        if (data == null) {
            return new PageResult>();
        }
        PageResult> result = new PageResult>();
        result.setPageNum(data.getPageNum());
        result.setPageSize(data.getPageSize());
        result.setPageCount(data.getPageCount());
        result.setTotal(data.getTotal());
        List fList = data.getData();
        List tList = BeanUtils.beanToBeanInList(fList, clazz);
        result.setData(tList);
        return result;
    }

}