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package com.github.antelopeframework.mybatis.paged;

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

import com.github.antelopeframework.data.support.Paged;
import com.github.antelopeframework.data.support.PagedRequest;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;

/**
 * MyBatis 分页查询辅助类. 

 * 使用方式:
 * 
 *  * Paged<Object> pagedResult = PagedQueryRunner.run(0, 3, new PagedQueryCallback<Object>() {
 * 
 * 	©Override
 * 	public List<Object> queuy() {
 * 		//MyBatis 查询语句
 * 	}
 * });
 * 
 * for (Object one : pagedResult.getContent()) {
 * 	// 业务处理逻辑
 * }
 * 
 * 
 * 
 * @author yangzhi.yzh
 *
 */
public abstract class PagedQueryRunner {
	
    /**
     * 
     * @param first
     * @param max
     * @param callback
     * @return
     */
    public static  Paged run(Integer first, Integer max, PagedQueryCallback callback) {
        if (first == null || first < 0) {
            first = 0;
        }
        
        if (max == null || max <= 0) {
            max = 10;
        }
        
        PageHelper.startPage(first / max + 1, max, true);
        
        List queryResult = callback.queuy();
        if (queryResult == null) {
        	return new Paged(new ArrayList());
        }
        
        Page ibatisList = ((Page) queryResult);
        
        return new Paged(queryResult, new PagedRequest(first % max, max), ibatisList.getTotal());
    } 
}