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package com.ruoyi.common.utils.uuid;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.util.Random;
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import java.util.concurrent.ThreadLocalRandom;
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import com.ruoyi.common.exception.UtilException;
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/**
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* 提供通用唯一识别码（universally unique identifier）（UUID）实现
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*
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* @author ruoyi
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*/
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public final class UUID implements java.io.Serializable, Comparable<UUID>
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{
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private static final long serialVersionUID = -1185015143654744140L;
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/**
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* SecureRandom 的单例
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*
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*/
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private static class Holder
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{
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static final SecureRandom numberGenerator = getSecureRandom();
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}
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/** 此UUID的最高64有效位 */
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private final long mostSigBits;
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/** 此UUID的最低64有效位 */
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private final long leastSigBits;
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/**
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* 私有构造
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*
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* @param data 数据
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*/
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private UUID(byte[] data)
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{
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long msb = 0;
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long lsb = 0;
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assert data.length == 16 : "data must be 16 bytes in length";
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for (int i = 0; i < 8; i++)
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{
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msb = (msb << 8) | (data[i] & 0xff);
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}
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for (int i = 8; i < 16; i++)
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{
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lsb = (lsb << 8) | (data[i] & 0xff);
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}
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this.mostSigBits = msb;
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this.leastSigBits = lsb;
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}
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/**
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* 使用指定的数据构造新的 UUID。
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*
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* @param mostSigBits 用于 {@code UUID} 的最高有效 64 位
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* @param leastSigBits 用于 {@code UUID} 的最低有效 64 位
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*/
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public UUID(long mostSigBits, long leastSigBits)
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{
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this.mostSigBits = mostSigBits;
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this.leastSigBits = leastSigBits;
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}
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/**
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* 获取类型 4（伪随机生成的）UUID 的静态工厂。 使用加密的本地线程伪随机数生成器生成该 UUID。
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*
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* @return 随机生成的 {@code UUID}
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*/
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public static UUID fastUUID()
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{
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return randomUUID(false);
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}
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/**
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* 获取类型 4（伪随机生成的）UUID 的静态工厂。 使用加密的强伪随机数生成器生成该 UUID。
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*
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* @return 随机生成的 {@code UUID}
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*/
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public static UUID randomUUID()
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{
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return randomUUID(true);
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}
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/**
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* 获取类型 4（伪随机生成的）UUID 的静态工厂。 使用加密的强伪随机数生成器生成该 UUID。
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*
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* @param isSecure 是否使用{@link SecureRandom}如果是可以获得更安全的随机码，否则可以得到更好的性能
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* @return 随机生成的 {@code UUID}
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*/
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public static UUID randomUUID(boolean isSecure)
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{
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final Random ng = isSecure ? Holder.numberGenerator : getRandom();
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byte[] randomBytes = new byte[16];
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ng.nextBytes(randomBytes);
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randomBytes[6] &= 0x0f; /* clear version */
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randomBytes[6] |= 0x40; /* set to version 4 */
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randomBytes[8] &= 0x3f; /* clear variant */
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randomBytes[8] |= 0x80; /* set to IETF variant */
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return new UUID(randomBytes);
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}
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/**
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* 根据指定的字节数组获取类型 3（基于名称的）UUID 的静态工厂。
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*
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* @param name 用于构造 UUID 的字节数组。
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*
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* @return 根据指定数组生成的 {@code UUID}
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*/
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public static UUID nameUUIDFromBytes(byte[] name)
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{
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MessageDigest md;
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try
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{
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md = MessageDigest.getInstance("MD5");
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}
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catch (NoSuchAlgorithmException nsae)
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{
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throw new InternalError("MD5 not supported");
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}
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byte[] md5Bytes = md.digest(name);
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md5Bytes[6] &= 0x0f; /* clear version */
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md5Bytes[6] |= 0x30; /* set to version 3 */
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md5Bytes[8] &= 0x3f; /* clear variant */
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md5Bytes[8] |= 0x80; /* set to IETF variant */
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return new UUID(md5Bytes);
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}
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/**
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* 根据 {@link #toString()} 方法中描述的字符串标准表示形式创建{@code UUID}。
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*
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* @param name 指定 {@code UUID} 字符串
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* @return 具有指定值的 {@code UUID}
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* @throws IllegalArgumentException 如果 name 与 {@link #toString} 中描述的字符串表示形式不符抛出此异常
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*
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*/
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public static UUID fromString(String name)
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{
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String[] components = name.split("-");
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if (components.length != 5)
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{
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throw new IllegalArgumentException("Invalid UUID string: " + name);
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}
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for (int i = 0; i < 5; i++)
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{
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components[i] = "0x" + components[i];
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}
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long mostSigBits = Long.decode(components[0]).longValue();
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mostSigBits <<= 16;
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mostSigBits |= Long.decode(components[1]).longValue();
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mostSigBits <<= 16;
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mostSigBits |= Long.decode(components[2]).longValue();
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long leastSigBits = Long.decode(components[3]).longValue();
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leastSigBits <<= 48;
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leastSigBits |= Long.decode(components[4]).longValue();
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return new UUID(mostSigBits, leastSigBits);
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}
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/**
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* 返回此 UUID 的 128 位值中的最低有效 64 位。
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*
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* @return 此 UUID 的 128 位值中的最低有效 64 位。
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*/
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public long getLeastSignificantBits()
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{
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return leastSigBits;
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}
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/**
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* 返回此 UUID 的 128 位值中的最高有效 64 位。
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*
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* @return 此 UUID 的 128 位值中最高有效 64 位。
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*/
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public long getMostSignificantBits()
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{
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return mostSigBits;
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}
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/**
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* 与此 {@code UUID} 相关联的版本号. 版本号描述此 {@code UUID} 是如何生成的。
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* <p>
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* 版本号具有以下含意:
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* <ul>
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* <li>1 基于时间的 UUID
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* <li>2 DCE 安全 UUID
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* <li>3 基于名称的 UUID
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* <li>4 随机生成的 UUID
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* </ul>
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*
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* @return 此 {@code UUID} 的版本号
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*/
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public int version()
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{
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// Version is bits masked by 0x000000000000F000 in MS long
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return (int) ((mostSigBits >> 12) & 0x0f);
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}
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/**
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* 与此 {@code UUID} 相关联的变体号。变体号描述 {@code UUID} 的布局。
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* <p>
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* 变体号具有以下含意：
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* <ul>
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* <li>0 为 NCS 向后兼容保留
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* <li>2 <a href="http://www.ietf.org/rfc/rfc4122.txt">IETF RFC 4122</a>(Leach-Salz), 用于此类
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* <li>6 保留，微软向后兼容
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* <li>7 保留供以后定义使用
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* </ul>
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*
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* @return 此 {@code UUID} 相关联的变体号
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*/
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public int variant()
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{
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// This field is composed of a varying number of bits.
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// 0 - - Reserved for NCS backward compatibility
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// 1 0 - The IETF aka Leach-Salz variant (used by this class)
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// 1 1 0 Reserved, Microsoft backward compatibility
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// 1 1 1 Reserved for future definition.
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return (int) ((leastSigBits >>> (64 - (leastSigBits >>> 62))) & (leastSigBits >> 63));
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}
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/**
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* 与此 UUID 相关联的时间戳值。
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*
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* <p>
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* 60 位的时间戳值根据此 {@code UUID} 的 time_low、time_mid 和 time_hi 字段构造。<br>
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* 所得到的时间戳以 100 毫微秒为单位，从 UTC（通用协调时间） 1582 年 10 月 15 日零时开始。
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*
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* <p>
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* 时间戳值仅在在基于时间的 UUID（其 version 类型为 1）中才有意义。<br>
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* 如果此 {@code UUID} 不是基于时间的 UUID，则此方法抛出 UnsupportedOperationException。
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*
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* @throws UnsupportedOperationException 如果此 {@code UUID} 不是 version 为 1 的 UUID。
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*/
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public long timestamp() throws UnsupportedOperationException
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{
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checkTimeBase();
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return (mostSigBits & 0x0FFFL) << 48//
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| ((mostSigBits >> 16) & 0x0FFFFL) << 32//
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| mostSigBits >>> 32;
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}
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/**
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* 与此 UUID 相关联的时钟序列值。
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*
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* <p>
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* 14 位的时钟序列值根据此 UUID 的 clock_seq 字段构造。clock_seq 字段用于保证在基于时间的 UUID 中的时间唯一性。
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* <p>
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* {@code clockSequence} 值仅在基于时间的 UUID（其 version 类型为 1）中才有意义。 如果此 UUID 不是基于时间的 UUID，则此方法抛出
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* UnsupportedOperationException。
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*
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* @return 此 {@code UUID} 的时钟序列
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*
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* @throws UnsupportedOperationException 如果此 UUID 的 version 不为 1
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*/
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public int clockSequence() throws UnsupportedOperationException
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{
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checkTimeBase();
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return (int) ((leastSigBits & 0x3FFF000000000000L) >>> 48);
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}
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/**
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* 与此 UUID 相关的节点值。
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*
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* <p>
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* 48 位的节点值根据此 UUID 的 node 字段构造。此字段旨在用于保存机器的 IEEE 802 地址，该地址用于生成此 UUID 以保证空间唯一性。
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* <p>
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* 节点值仅在基于时间的 UUID（其 version 类型为 1）中才有意义。<br>
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* 如果此 UUID 不是基于时间的 UUID，则此方法抛出 UnsupportedOperationException。
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*
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* @return 此 {@code UUID} 的节点值
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*
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* @throws UnsupportedOperationException 如果此 UUID 的 version 不为 1
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*/
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public long node() throws UnsupportedOperationException
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{
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checkTimeBase();
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return leastSigBits & 0x0000FFFFFFFFFFFFL;
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}
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/**
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* 返回此{@code UUID} 的字符串表现形式。
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*
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* <p>
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* UUID 的字符串表示形式由此 BNF 描述：
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*
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* <pre>
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* {@code
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* UUID = <time_low>-<time_mid>-<time_high_and_version>-<variant_and_sequence>-<node>
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* time_low = 4*<hexOctet>
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* time_mid = 2*<hexOctet>
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* time_high_and_version = 2*<hexOctet>
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* variant_and_sequence = 2*<hexOctet>
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* node = 6*<hexOctet>
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* hexOctet = <hexDigit><hexDigit>
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* hexDigit = [0-9a-fA-F]
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* }
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* </pre>
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*
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* </blockquote>
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*
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* @return 此{@code UUID} 的字符串表现形式
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* @see #toString(boolean)
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*/
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@Override
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public String toString()
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|
{
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return toString(false);
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|
}
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/**
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* 返回此{@code UUID} 的字符串表现形式。
|
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*
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* <p>
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* UUID 的字符串表示形式由此 BNF 描述：
|
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*
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* <pre>
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* {@code
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* UUID = <time_low>-<time_mid>-<time_high_and_version>-<variant_and_sequence>-<node>
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* time_low = 4*<hexOctet>
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* time_mid = 2*<hexOctet>
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* time_high_and_version = 2*<hexOctet>
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* variant_and_sequence = 2*<hexOctet>
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* node = 6*<hexOctet>
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* hexOctet = <hexDigit><hexDigit>
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* hexDigit = [0-9a-fA-F]
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* }
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* </pre>
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*
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* </blockquote>
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*
|
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|
|
* @param isSimple 是否简单模式，简单模式为不带'-'的UUID字符串
|
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* @return 此{@code UUID} 的字符串表现形式
|
|
|
|
|
*/
|
|
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|
|
public String toString(boolean isSimple)
|
|
|
|
|
{
|
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|
|
final StringBuilder builder = new StringBuilder(isSimple ? 32 : 36);
|
|
|
|
|
// time_low
|
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|
|
builder.append(digits(mostSigBits >> 32, 8));
|
|
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|
|
if (false == isSimple)
|
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|
|
{
|
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|
|
builder.append('-');
|
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|
|
}
|
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|
|
// time_mid
|
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|
|
builder.append(digits(mostSigBits >> 16, 4));
|
|
|
|
|
if (false == isSimple)
|
|
|
|
|
{
|
|
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|
|
builder.append('-');
|
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|
|
|
}
|
|
|
|
|
// time_high_and_version
|
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|
|
builder.append(digits(mostSigBits, 4));
|
|
|
|
|
if (false == isSimple)
|
|
|
|
|
{
|
|
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|
|
builder.append('-');
|
|
|
|
|
}
|
|
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|
|
// variant_and_sequence
|
|
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|
|
builder.append(digits(leastSigBits >> 48, 4));
|
|
|
|
|
if (false == isSimple)
|
|
|
|
|
{
|
|
|
|
|
builder.append('-');
|
|
|
|
|
}
|
|
|
|
|
// node
|
|
|
|
|
builder.append(digits(leastSigBits, 12));
|
|
|
|
|
|
|
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|
|
return builder.toString();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 返回此 UUID 的哈希码。
|
|
|
|
|
*
|
|
|
|
|
* @return UUID 的哈希码值。
|
|
|
|
|
*/
|
|
|
|
|
@Override
|
|
|
|
|
public int hashCode()
|
|
|
|
|
{
|
|
|
|
|
long hilo = mostSigBits ^ leastSigBits;
|
|
|
|
|
return ((int) (hilo >> 32)) ^ (int) hilo;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 将此对象与指定对象比较。
|
|
|
|
|
* <p>
|
|
|
|
|
* 当且仅当参数不为 {@code null}、而是一个 UUID 对象、具有与此 UUID 相同的 varriant、包含相同的值（每一位均相同）时，结果才为 {@code true}。
|
|
|
|
|
*
|
|
|
|
|
* @param obj 要与之比较的对象
|
|
|
|
|
*
|
|
|
|
|
* @return 如果对象相同，则返回 {@code true}；否则返回 {@code false}
|
|
|
|
|
*/
|
|
|
|
|
@Override
|
|
|
|
|
public boolean equals(Object obj)
|
|
|
|
|
{
|
|
|
|
|
if ((null == obj) || (obj.getClass() != UUID.class))
|
|
|
|
|
{
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
UUID id = (UUID) obj;
|
|
|
|
|
return (mostSigBits == id.mostSigBits && leastSigBits == id.leastSigBits);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Comparison Operations
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 将此 UUID 与指定的 UUID 比较。
|
|
|
|
|
*
|
|
|
|
|
* <p>
|
|
|
|
|
* 如果两个 UUID 不同，且第一个 UUID 的最高有效字段大于第二个 UUID 的对应字段，则第一个 UUID 大于第二个 UUID。
|
|
|
|
|
*
|
|
|
|
|
* @param val 与此 UUID 比较的 UUID
|
|
|
|
|
*
|
|
|
|
|
* @return 在此 UUID 小于、等于或大于 val 时，分别返回 -1、0 或 1。
|
|
|
|
|
*
|
|
|
|
|
*/
|
|
|
|
|
@Override
|
|
|
|
|
public int compareTo(UUID val)
|
|
|
|
|
{
|
|
|
|
|
// The ordering is intentionally set up so that the UUIDs
|
|
|
|
|
// can simply be numerically compared as two numbers
|
|
|
|
|
return (this.mostSigBits < val.mostSigBits ? -1 : //
|
|
|
|
|
(this.mostSigBits > val.mostSigBits ? 1 : //
|
|
|
|
|
(this.leastSigBits < val.leastSigBits ? -1 : //
|
|
|
|
|
(this.leastSigBits > val.leastSigBits ? 1 : //
|
|
|
|
|
0))));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// -------------------------------------------------------------------------------------------------------------------
|
|
|
|
|
// Private method start
|
|
|
|
|
/**
|
|
|
|
|
* 返回指定数字对应的hex值
|
|
|
|
|
*
|
|
|
|
|
* @param val 值
|
|
|
|
|
* @param digits 位
|
|
|
|
|
* @return 值
|
|
|
|
|
*/
|
|
|
|
|
private static String digits(long val, int digits)
|
|
|
|
|
{
|
|
|
|
|
long hi = 1L << (digits * 4);
|
|
|
|
|
return Long.toHexString(hi | (val & (hi - 1))).substring(1);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 检查是否为time-based版本UUID
|
|
|
|
|
*/
|
|
|
|
|
private void checkTimeBase()
|
|
|
|
|
{
|
|
|
|
|
if (version() != 1)
|
|
|
|
|
{
|
|
|
|
|
throw new UnsupportedOperationException("Not a time-based UUID");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 获取{@link SecureRandom}，类提供加密的强随机数生成器 (RNG)
|
|
|
|
|
*
|
|
|
|
|
* @return {@link SecureRandom}
|
|
|
|
|
*/
|
|
|
|
|
public static SecureRandom getSecureRandom()
|
|
|
|
|
{
|
|
|
|
|
try
|
|
|
|
|
{
|
|
|
|
|
return SecureRandom.getInstance("SHA1PRNG");
|
|
|
|
|
}
|
|
|
|
|
catch (NoSuchAlgorithmException e)
|
|
|
|
|
{
|
|
|
|
|
throw new UtilException(e);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 获取随机数生成器对象<br>
|
|
|
|
|
* ThreadLocalRandom是JDK 7之后提供并发产生随机数，能够解决多个线程发生的竞争争夺。
|
|
|
|
|
*
|
|
|
|
|
* @return {@link ThreadLocalRandom}
|
|
|
|
|
*/
|
|
|
|
|
public static ThreadLocalRandom getRandom()
|
|
|
|
|
{
|
|
|
|
|
return ThreadLocalRandom.current();
|
|
|
|
|
}
|
|
|
|
|
}
|
RuoYi
4 years ago
committed by
Limy