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package com.feingto.cloud.kit;

import java.security.SecureRandom;
import java.util.UUID;

/**
 * 封装各种生成唯一性ID算法的工具类.
 *
 * @author longfei
 */
public class Identities {
    private static final SecureRandom random = new SecureRandom();

    /**
     * 封装JDK自带的UUID, 通过Random数字生成, 中间有-分割.
     */
    public static String uuid() {
        return UUID.randomUUID().toString();
    }

    /**
     * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
     */
    public static String uuid2() {
        return uuid().replaceAll("-", "");
    }

    /**
     * 使用SecureRandom随机生成Long.
     */
    public static long randomLong() {
        return Math.abs(random.nextLong());
    }

    /**
     * 基于Base62编码的SecureRandom随机生成bytes.
     */
    public static String randomBase62(int length) {
        byte[] randomBytes = new byte[length];
        random.nextBytes(randomBytes);
        return EncodeKit.encodeBase62(randomBytes);
    }
}