package com.fh.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.ComparatorUtils;
import org.apache.commons.collections.comparators.ComparableComparator;
import org.apache.commons.collections.comparators.ComparatorChain;
public class SortUtil {
	
	/**
	 * 对list进行排序
	 * @param sortList 需要排序的list
	 * @param param1   排序的参数名称
	 * @param orderType 排序类型：正序-asc；倒序-desc  
	 */
	@SuppressWarnings("unchecked")
	public static List<Object> sort(List<Object> sortList, String param1, String orderType){
		Comparator<Object> mycmp1 = ComparableComparator.getInstance ();
		if("desc".equals(orderType)){
			mycmp1 = ComparatorUtils. reversedComparator(mycmp1); //逆序（默认为正序）
		}
		
		ArrayList<Object> sortFields = new ArrayList<Object>();
		sortFields.add( new BeanComparator(param1 , mycmp1)); //主排序（第一排序）

		ComparatorChain multiSort = new ComparatorChain(sortFields);
		Collections.sort (sortList , multiSort);
		
		return sortList;
	}
	
	/**
	 * 对list进行排序
	 * @param sortList 需要排序的list
	 * @param param1   排序的参数名称:参数长度
	 * @param param2   排序的参数名称:排序参数
	 * @param orderType 排序类型：正序-asc；倒序-desc  
	 */
	@SuppressWarnings("unchecked")
	public static List<Object> sortParam2(List<Object> sortList, String param1,String param2, String orderType){
		Comparator<Object> mycmp1 = ComparableComparator.getInstance ();
		Comparator<Object> mycmp2 = ComparableComparator.getInstance ();
		if("desc".equals(orderType)){
			mycmp1 = ComparatorUtils. reversedComparator(mycmp1); //逆序（默认为正序）
		}
		
		ArrayList<Object> sortFields = new ArrayList<Object>();
		sortFields.add( new BeanComparator(param1 , mycmp1)); //主排序（第一排序）
		sortFields.add( new BeanComparator(param2 , mycmp2)); //主排序（第一排序）

		ComparatorChain multiSort = new ComparatorChain(sortFields);
		Collections.sort (sortList , multiSort);
		
		return sortList;
	}
	
}