package com.xcong.excoin.utils;
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import java.util.Random;
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/**
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* 邀请码生成器，算法原理：<br/>
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* 1) 获取id: 1127738 <br/>
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* 2) 使用自定义进制转为：gpm6 <br/>
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* 3) 转为字符串，并在后面加'o'字符：gpm6o <br/>
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* 4）在后面随机产生若干个随机数字字符：gpm6o7 <br/>
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* 转为自定义进制后就不会出现o这个字符，然后在后面加个'o'，这样就能确定唯一性。最后在后面产生一些随机字符进行补全。<br/>
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*/
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public class ShareCodeUtil {
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/**
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* 自定义进制(0,1没有加入,容易与o,l混淆)
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*/
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// private static final char[] r=new char[]{'q', 'w', 'e', '8', 'a', 's', '2', 'd', 'z', 'x', '9', 'c', '7', 'p', '5', 'i', 'k', '3', 'm', 'j', 'u', 'f', 'r', '4', 'v', 'y', 'l', 't', 'n', '6', 'b', 'g', 'h'};
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private static final char[] r = new char[]{'1', '2', '3', '4', '5', '6', '7', '8', '9'};
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/**
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* (不能与自定义进制有重复)
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*/
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private static final char b = '0';
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/**
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* 进制长度
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*/
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private static final int binLen = r.length;
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/**
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* 序列最小长度
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*/
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private static final int s = 8;
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/**
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* 根据ID生成六位随机码
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*
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* @param id ID
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* @return 随机码
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*/
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public static String toSerialCode(long id) {
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char[] buf = new char[32];
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int charPos = 32;
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while ((id / binLen) > 0) {
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int ind = (int) (id % binLen);
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buf[--charPos] = r[ind];
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id /= binLen;
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}
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buf[--charPos] = r[(int) (id % binLen)];
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String str = new String(buf, charPos, (32 - charPos));
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// 不够长度的自动随机补全
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if (str.length() < s) {
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StringBuilder sb = new StringBuilder();
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sb.append(b);
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Random rnd = new Random();
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for (int i = 1; i < s - str.length(); i++) {
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sb.append(r[rnd.nextInt(binLen)]);
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}
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str += sb.toString();
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}
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return str;
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}
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/**
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* 根据ID生成六位随机码
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*
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* @param id ID
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* @return 随机码
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*/
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public static String toSerialNumberCode(long id) {
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char[] buf = new char[32];
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int charPos = 32;
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while ((id / binLen) > 0) {
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int ind = (int) (id % binLen);
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buf[--charPos] = r[ind];
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id /= binLen;
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}
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buf[--charPos] = r[(int) (id % binLen)];
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String str = new String(buf, charPos, (32 - charPos));
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// 不够长度的自动随机补全
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if (str.length() < s) {
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StringBuilder sb = new StringBuilder();
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sb.append(b);
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Random rnd = new Random();
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for (int i = 1; i < s - str.length(); i++) {
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sb.append(r[rnd.nextInt(binLen)]);
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}
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str += sb.toString();
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}
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return str;
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}
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public static long codeToId(String code) {
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char chs[] = code.toCharArray();
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long res = 0L;
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for (int i = 0; i < chs.length; i++) {
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int ind = 0;
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for (int j = 0; j < binLen; j++) {
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if (chs[i] == r[j]) {
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ind = j;
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break;
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}
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}
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if (chs[i] == b) {
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break;
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}
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if (i > 0) {
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res = res * binLen + ind;
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} else {
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res = ind;
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}
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}
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return res;
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}
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}
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