com.kegare.caveworld.util.Roman.java Source code

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Here is the source code for com.kegare.caveworld.util.Roman.java

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/*
 * Caveworld
 *
 * Copyright (c) 2014 kegare
 * https://github.com/kegare
 *
 * This mod is distributed under the terms of the Minecraft Mod Public License Japanese Translation, or MMPL_J.
 */

package com.kegare.caveworld.util;

import org.apache.commons.lang3.StringUtils;

public class Roman {
    private static final int[] values = { 1, 10, 100, 1000 };
    private static final char[] ones = { 'I', 'X', 'C', 'M' };
    private static final char[] fives = { 'V', 'L', 'D' };

    public static String toRoman(int num) {
        if (num <= 0 || num >= 4000) {
            return "";
        }

        StringBuilder ret = new StringBuilder();

        for (int i = 3; i >= 0; i--) {
            int r = num / values[i];
            num %= values[i];

            if (r == 4) {
                ret.append(ones[i]).append(fives[i]);
                continue;
            }

            if (r == 9) {
                ret.append(ones[i]).append(ones[i + 1]);
                continue;
            }

            if (r >= 5) {
                ret.append(fives[i]);
                r -= 5;
            }

            ret.append(StringUtils.repeat(ones[i], r));
        }

        return ret.toString();
    }
}