gunshi-project-ss/src/main/java/com/gunshi/project/xyt/util/DataHandleUtil.java

package com.gunshi.project.xyt.util;


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


public class DataHandleUtil {

    /**
     * 判断BigDecimal的小数部分是否为0
     * @param bigDecimal
     * @return
     */
    public static long BigDecimalIntegerPart(BigDecimal bigDecimal) {
        BigDecimal integerPart = bigDecimal.setScale(0, RoundingMode.UP);
        return integerPart.longValue();
    }


    public static BigDecimal calcData(BigDecimal rz, Map<BigDecimal, BigDecimal> map,List<BigDecimal> list) {
        //库容曲线中最近的一组水位
        BigDecimal lowerRz = new BigDecimal(0);
        BigDecimal upperRz = new BigDecimal(0);

        //库容曲线中最近的一组水位对应的库容
        BigDecimal lowerW = new BigDecimal(0);
        BigDecimal upperW = new BigDecimal(0);

        for(int i=0;i<list.size()-1;i++){
            if (rz.compareTo(list.get(i)) >= 0 && rz.compareTo(list.get(i+1)) <= 0) {
                lowerRz = list.get(i);
                upperRz = list.get(i+1);

                lowerW = map.get(lowerRz);
                upperW = map.get(upperRz);
                break;
            }
        }
        BigDecimal diff = rz.subtract(lowerRz);
        return lowerW.add(diff.multiply(upperW.subtract(lowerW)).divide(upperRz.subtract(lowerRz),2,RoundingMode.UP));
    }

    public static List<List> tableData( List<Map<String, Object>> list){
        List<List> list2 = new ArrayList<>();
        Collection values;
        for (int i = 0; i < list.size(); i++) {
            values = list.get(i).values();
            List objects = new ArrayList<>();
            for (Object value : values) {
                objects.add(value == null ? "" : value.toString());
            }
            list2.add(objects);
        }
        return list2;
    }

    public static <T> List<T> paginate(List<T> list, int pageNumber, int pageSize) {
        if (list == null || list.isEmpty()) {
            return new ArrayList<T>();
        }

        int totalSize = list.size();
        int fromIndex = (pageNumber - 1) * pageSize;
        if (fromIndex >= totalSize || fromIndex < 0) {
            return new ArrayList<T>();
        }

        int toIndex = fromIndex + pageSize;
        if (toIndex > totalSize) {
            toIndex = totalSize;
        }

        return list.subList(fromIndex, toIndex);
    }


}