repal-service/src/main/java/com/winhc/repal/util/BillGradeUtil.java

package com.winhc.repal.util;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.winhc.repal.model.vo.HomeGradeVO;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.ArrayList;
import java.util.List;

/**
 * @Description: BillGradeUtil
 * @Author: xda
 * @Date: 2022/5/7 18:31
 */
public class BillGradeUtil {


    public static List<HomeGradeVO> getGradeList(List<String> gradeList) {
        if (CollUtil.isEmpty(gradeList)) {
            return new ArrayList<>();
        }
        int total = gradeList.size();
        long aCount = gradeList.stream().filter("A"::equals).count();;
        long bCount = gradeList.stream().filter("B"::equals).count();;
        long cCount = gradeList.stream().filter("C"::equals).count();;
        long dCount = gradeList.stream().filter("D"::equals).count();;
        long nCount = gradeList.stream().filter(StrUtil::isNotBlank).count();;
        return new ArrayList<HomeGradeVO>(){{
            add(new HomeGradeVO(Math.toIntExact(aCount), new BigDecimal(aCount).divide(new BigDecimal(total), 1, RoundingMode.HALF_UP).stripTrailingZeros().toPlainString()));
            add(new HomeGradeVO(Math.toIntExact(bCount), new BigDecimal(bCount).divide(new BigDecimal(total), 1, RoundingMode.HALF_UP).stripTrailingZeros().toPlainString()));
            add(new HomeGradeVO(Math.toIntExact(cCount), new BigDecimal(cCount).divide(new BigDecimal(total), 1, RoundingMode.HALF_UP).stripTrailingZeros().toPlainString()));
            add(new HomeGradeVO(Math.toIntExact(dCount), new BigDecimal(dCount).divide(new BigDecimal(total), 1, RoundingMode.HALF_UP).stripTrailingZeros().toPlainString()));
            add(new HomeGradeVO(Math.toIntExact(nCount), new BigDecimal(nCount).divide(new BigDecimal(total), 1, RoundingMode.HALF_UP).stripTrailingZeros().toPlainString()));
        }};
    }
}