Used for formatting SI units

SIUtils

package com.arcadianmc.skyblock.utils;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.experimental.UtilityClass;

/**
 * Created by Kyle on 3/22/2017.
 */
@UtilityClass
public class SIUtils {
    
    public static String formatSi(double amount) {
        int order = 0;
        while (amount > 1000.0) {
            amount /= 1000.0;
            order += 3;
        }
        while (amount < 1.0) {
            amount *= 1000.0;
            order -= 3;
        }
        return (amount + SISignifier.getSuffix(order)).replaceFirst("\\.0[a-zA-Z]", "");
    }
    
    @AllArgsConstructor
    private enum SISignifier {
        YOTTA(24, "Y"),
        ZETTA(21, "Z"),
        EXA(18, "E"),
        PETA(15, "P"),
        TERA(12, "T"),
        GIGA(9, "G"),
        MEGA(6, "M"),
        KILO(3, "k"),
        HECTO(2, "h"),
        DEKA(1, "da"),
        NONE(0, ""),
        DECI(-1, "d"),
        CENTI(-2, "c"),
        MILLI(-3, "m"),
        MICRO(-6, "µ"),
        NANO(-9, "n"),
        PICO(-12, "p"),
        FEMTO(-15, "f"),
        ATTO(-18, "a"),
        ZEPTO(-21, "z"),
        YOCTO(-24, "y");
        
        @Getter
        private final int factor;
        @Getter
        private final String suffix;
        
        private static String getSuffix(int exp) {
            for (SISignifier siSignifier : SISignifier.values()) {
                if (siSignifier.getFactor() == exp) {
                    return siSignifier.getSuffix();
                }
            }
            throw new IllegalArgumentException("No suffix for 10^" + exp);
        }
    }
}