package com.ag.util;

import java.util.UUID;

/**
 * Created by Administrator on 2017/3/29 0029.
 */
public class UUIDUtil {
    public UUIDUtil() {
    }

    /**
     * ????UUID
     *
     * @return String UUID
     */
    public static String getUUID() {
        return UUID.randomUUID().toString().replaceAll("-","");
    }

    /**
     * ???????UUID
     *
     * @param number
     *            int ?????UUID??
     * @return String[] UUID??
     */
    public static String[] getUUID(int number) {
        if (number < 1) {
            return null;
        }
        String[] ss = new String[number];
        for (int i = 0; i < number; i++) {
            ss[i] = getUUID();
        }
        return ss;
    }

    /**
     * ????????base64??
     */
    public static char[] encode(byte[] data) {
        char[] out = new char[((data.length + 2) / 3) * 4];
        for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {
            boolean quad = false;
            boolean trip = false;
            int val = (0xFF & (int) data[i]);
            val <<= 8;
            if ((i + 1) < data.length) {
                val |= (0xFF & (int) data[i + 1]);
                trip = true;
            }
            val <<= 8;
            if ((i + 2) < data.length) {
                val |= (0xFF & (int) data[i + 2]);
                quad = true;
            }
            out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];
            val >>= 6;
            out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];
            val >>= 6;
            out[index + 1] = alphabet[val & 0x3F];
            val >>= 6;
            out[index + 0] = alphabet[val & 0x3F];
        }
        return out;
    }
    /**
     * ?base64????????????
     */
    public static byte[] decode(char[] data) {
        int len = ((data.length + 3) / 4) * 3;
        if (data.length > 0 && data[data.length - 1] == '=')
            --len;
        if (data.length > 1 && data[data.length - 2] == '=')
            --len;
        byte[] out = new byte[len];
        int shift = 0;
        int accum = 0;
        int index = 0;
        for (int ix = 0; ix < data.length; ix++) {
            int value = codes[data[ix] & 0xFF];
            if (value >= 0) {
                accum <<= 6;
                shift += 6;
                accum |= value;
                if (shift >= 8) {
                    shift -= 8;
                    out[index++] = (byte) ((accum >> shift) & 0xff);
                }
            }
        }
        if (index != out.length)
            throw new Error("miscalculated data length!");
        return out;
    }
    static private char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
            .toCharArray();
    static private byte[] codes = new byte[256];
    static {
        for (int i = 0; i < 256; i++)
            codes[i] = -1;
        for (int i = 'A'; i <= 'Z'; i++)
            codes[i] = (byte) (i - 'A');
        for (int i = 'a'; i <= 'z'; i++)
            codes[i] = (byte) (26 + i - 'a');
        for (int i = '0'; i <= '9'; i++)
            codes[i] = (byte) (52 + i - '0');
        codes['+'] = 62;
        codes['/'] = 63;
    }
    public static void main(String[] args) throws Exception {
        // ???base64
        /*String strSrc = "ios";
        String strOut = new String(UUIDUtil.encode(strSrc.getBytes("UTF-8")));
        System.out.println(strOut);
        String strOut2 = new String(UUIDUtil.decode(strOut.toCharArray()),
                "UTF-8");
        System.out.println(strOut2);*/
        long on = System.nanoTime();
        long on1 = System.currentTimeMillis();
        System.out.println(UUIDUtil.getUUID());
        long end = System.nanoTime();
        long end1 = System.currentTimeMillis();


        System.out.println(end - on);
        System.out.println(end1 - on1);

    }

}