594 lines
21 KiB
Java
594 lines
21 KiB
Java
/*
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* Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.util;
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import android.compat.Compatibility;
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import android.compat.annotation.ChangeId;
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import android.compat.annotation.EnabledSince;
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import dalvik.annotation.compat.VersionCodes;
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import dalvik.system.VMRuntime;
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import java.security.*;
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/**
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* A class that represents an immutable universally unique identifier (UUID).
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* A UUID represents a 128-bit value.
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*
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* <p> There exist different variants of these global identifiers. The methods
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* of this class are for manipulating the Leach-Salz variant, although the
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* constructors allow the creation of any variant of UUID (described below).
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*
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* <p> The layout of a variant 2 (Leach-Salz) UUID is as follows:
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*
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* The most significant long consists of the following unsigned fields:
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* <pre>
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* 0xFFFFFFFF00000000 time_low
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* 0x00000000FFFF0000 time_mid
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* 0x000000000000F000 version
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* 0x0000000000000FFF time_hi
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* </pre>
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* The least significant long consists of the following unsigned fields:
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* <pre>
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* 0xC000000000000000 variant
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* 0x3FFF000000000000 clock_seq
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* 0x0000FFFFFFFFFFFF node
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* </pre>
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*
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* <p> The variant field contains a value which identifies the layout of the
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* {@code UUID}. The bit layout described above is valid only for a {@code
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* UUID} with a variant value of 2, which indicates the Leach-Salz variant.
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*
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* <p> The version field holds a value that describes the type of this {@code
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* UUID}. There are four different basic types of UUIDs: time-based, DCE
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* security, name-based, and randomly generated UUIDs. These types have a
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* version value of 1, 2, 3 and 4, respectively.
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*
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* <p> For more information including algorithms used to create {@code UUID}s,
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* see <a href="http://www.ietf.org/rfc/rfc4122.txt"> <i>RFC 4122: A
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* Universally Unique IDentifier (UUID) URN Namespace</i></a>, section 4.2
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* "Algorithms for Creating a Time-Based UUID".
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*
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* @since 1.5
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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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* Explicit serialVersionUID for interoperability.
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*/
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@java.io.Serial
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private static final long serialVersionUID = -4856846361193249489L;
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/*
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* The most significant 64 bits of this UUID.
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*
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* @serial
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*/
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private final long mostSigBits;
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/*
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* The least significant 64 bits of this UUID.
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*
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* @serial
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*/
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private final long leastSigBits;
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// Android-removed: not using JavaLangAccess.fastUUID.
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// private static final JavaLangAccess jla = SharedSecrets.getJavaLangAccess();
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/*
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* The random number generator used by this class to create random
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* based UUIDs. In a holder class to defer initialization until needed.
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*/
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private static class Holder {
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static final SecureRandom numberGenerator = new SecureRandom();
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}
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// Constructors and Factories
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/*
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* Private constructor which uses a byte array to construct the new UUID.
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*/
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private UUID(byte[] data) {
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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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msb = (msb << 8) | (data[i] & 0xff);
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for (int i=8; i<16; i++)
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lsb = (lsb << 8) | (data[i] & 0xff);
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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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* Constructs a new {@code UUID} using the specified data. {@code
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* mostSigBits} is used for the most significant 64 bits of the {@code
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* UUID} and {@code leastSigBits} becomes the least significant 64 bits of
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* the {@code UUID}.
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*
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* @param mostSigBits
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* The most significant bits of the {@code UUID}
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*
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* @param leastSigBits
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* The least significant bits of the {@code UUID}
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*/
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public UUID(long mostSigBits, long leastSigBits) {
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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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* Static factory to retrieve a type 4 (pseudo randomly generated) UUID.
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*
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* The {@code UUID} is generated using a cryptographically strong pseudo
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* random number generator.
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*
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* @return A randomly generated {@code UUID}
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*/
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public static UUID randomUUID() {
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SecureRandom ng = Holder.numberGenerator;
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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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* Static factory to retrieve a type 3 (name based) {@code UUID} based on
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* the specified byte array.
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*
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* @param name
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* A byte array to be used to construct a {@code UUID}
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*
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* @return A {@code UUID} generated from the specified array
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*/
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public static UUID nameUUIDFromBytes(byte[] name) {
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MessageDigest md;
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try {
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md = MessageDigest.getInstance("MD5");
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} catch (NoSuchAlgorithmException nsae) {
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throw new InternalError("MD5 not supported", nsae);
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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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private static final byte[] NIBBLES;
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static {
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byte[] ns = new byte[256];
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Arrays.fill(ns, (byte) -1);
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ns['0'] = 0;
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ns['1'] = 1;
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ns['2'] = 2;
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ns['3'] = 3;
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ns['4'] = 4;
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ns['5'] = 5;
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ns['6'] = 6;
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ns['7'] = 7;
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ns['8'] = 8;
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ns['9'] = 9;
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ns['A'] = 10;
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ns['B'] = 11;
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ns['C'] = 12;
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ns['D'] = 13;
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ns['E'] = 14;
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ns['F'] = 15;
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ns['a'] = 10;
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ns['b'] = 11;
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ns['c'] = 12;
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ns['d'] = 13;
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ns['e'] = 14;
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ns['f'] = 15;
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NIBBLES = ns;
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}
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private static long parse4Nibbles(String name, int pos) {
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byte[] ns = NIBBLES;
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char ch1 = name.charAt(pos);
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char ch2 = name.charAt(pos + 1);
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char ch3 = name.charAt(pos + 2);
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char ch4 = name.charAt(pos + 3);
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return (ch1 | ch2 | ch3 | ch4) > 0xff ?
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-1 : ns[ch1] << 12 | ns[ch2] << 8 | ns[ch3] << 4 | ns[ch4];
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}
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/**
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* Since Android 14 {@link #fromString} does more strict input argument
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* validation.
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*
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* This flag is enabled for apps targeting Android 14+.
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*
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* @hide
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*/
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@ChangeId
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@EnabledSince(targetSdkVersion = VersionCodes.UPSIDE_DOWN_CAKE)
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public static final long ENABLE_STRICT_VALIDATION = 263076149L;
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/**
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* Creates a {@code UUID} from the string standard representation as
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* described in the {@link #toString} method.
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*
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* @param name
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* A string that specifies a {@code UUID}
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*
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* @return A {@code UUID} with the specified value
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*
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* @throws IllegalArgumentException
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* If name does not conform to the string representation as
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* described in {@link #toString}
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*
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*/
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public static UUID fromString(String name) {
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// BEGIN Android-changed: Java 8 behaviour is more lenient and the new implementation
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// might break apps (b/254278943).
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// Using old implementation for apps targeting Android older than U.
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if (!(VMRuntime.getSdkVersion() >= VersionCodes.UPSIDE_DOWN_CAKE
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&& Compatibility.isChangeEnabled(ENABLE_STRICT_VALIDATION))) {
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return fromStringJava8(name);
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}
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return fromStringCurrentJava(name);
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// END Android-changed: Java 8 behaviour is more lenient and the new implementation
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// might break apps (b/254278943).
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}
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/**
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* Extracted for testing purposes only.
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* @hide
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*/
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public static UUID fromStringCurrentJava(String name) {
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if (name.length() == 36) {
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char ch1 = name.charAt(8);
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char ch2 = name.charAt(13);
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char ch3 = name.charAt(18);
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char ch4 = name.charAt(23);
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if (ch1 == '-' && ch2 == '-' && ch3 == '-' && ch4 == '-') {
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long msb1 = parse4Nibbles(name, 0);
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long msb2 = parse4Nibbles(name, 4);
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long msb3 = parse4Nibbles(name, 9);
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long msb4 = parse4Nibbles(name, 14);
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long lsb1 = parse4Nibbles(name, 19);
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long lsb2 = parse4Nibbles(name, 24);
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long lsb3 = parse4Nibbles(name, 28);
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long lsb4 = parse4Nibbles(name, 32);
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if ((msb1 | msb2 | msb3 | msb4 | lsb1 | lsb2 | lsb3 | lsb4) >= 0) {
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return new UUID(
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msb1 << 48 | msb2 << 32 | msb3 << 16 | msb4,
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lsb1 << 48 | lsb2 << 32 | lsb3 << 16 | lsb4);
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}
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}
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}
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return fromString1(name);
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}
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private static UUID fromString1(String name) {
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int len = name.length();
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if (len > 36) {
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throw new IllegalArgumentException("UUID string too large");
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}
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int dash1 = name.indexOf('-', 0);
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int dash2 = name.indexOf('-', dash1 + 1);
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int dash3 = name.indexOf('-', dash2 + 1);
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int dash4 = name.indexOf('-', dash3 + 1);
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int dash5 = name.indexOf('-', dash4 + 1);
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// For any valid input, dash1 through dash4 will be positive and dash5
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// negative, but it's enough to check dash4 and dash5:
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// - if dash1 is -1, dash4 will be -1
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// - if dash1 is positive but dash2 is -1, dash4 will be -1
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// - if dash1 and dash2 is positive, dash3 will be -1, dash4 will be
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// positive, but so will dash5
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if (dash4 < 0 || dash5 >= 0) {
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throw new IllegalArgumentException("Invalid UUID string: " + name);
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}
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long mostSigBits = Long.parseLong(name, 0, dash1, 16) & 0xffffffffL;
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mostSigBits <<= 16;
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mostSigBits |= Long.parseLong(name, dash1 + 1, dash2, 16) & 0xffffL;
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mostSigBits <<= 16;
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mostSigBits |= Long.parseLong(name, dash2 + 1, dash3, 16) & 0xffffL;
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long leastSigBits = Long.parseLong(name, dash3 + 1, dash4, 16) & 0xffffL;
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leastSigBits <<= 48;
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leastSigBits |= Long.parseLong(name, dash4 + 1, len, 16) & 0xffffffffffffL;
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return new UUID(mostSigBits, leastSigBits);
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}
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/**
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* Extracted for testing purposes only.
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* @hide
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*/
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public static UUID fromStringJava8(String name) {
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String[] components = name.split("-");
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if (components.length != 5)
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throw new IllegalArgumentException("Invalid UUID string: "+ name);
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for (int i=0; i<5; i++)
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components[i] = "0x"+components[i];
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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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// Field Accessor Methods
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/**
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* Returns the least significant 64 bits of this UUID's 128 bit value.
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*
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* @return The least significant 64 bits of this UUID's 128 bit value
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*/
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public long getLeastSignificantBits() {
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return leastSigBits;
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}
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/**
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* Returns the most significant 64 bits of this UUID's 128 bit value.
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*
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* @return The most significant 64 bits of this UUID's 128 bit value
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*/
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public long getMostSignificantBits() {
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return mostSigBits;
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}
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/**
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* The version number associated with this {@code UUID}. The version
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* number describes how this {@code UUID} was generated.
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*
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* The version number has the following meaning:
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* <ul>
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* <li>1 Time-based UUID
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* <li>2 DCE security UUID
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* <li>3 Name-based UUID
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* <li>4 Randomly generated UUID
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* </ul>
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*
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* @return The version number of this {@code UUID}
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*/
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public int version() {
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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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* The variant number associated with this {@code UUID}. The variant
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* number describes the layout of the {@code UUID}.
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*
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* The variant number has the following meaning:
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* <ul>
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* <li>0 Reserved for NCS backward compatibility
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* <li>2 <a href="http://www.ietf.org/rfc/rfc4122.txt">IETF RFC 4122</a>
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* (Leach-Salz), used by this class
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* <li>6 Reserved, Microsoft Corporation backward compatibility
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* <li>7 Reserved for future definition
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* </ul>
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*
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* @return The variant number of this {@code UUID}
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*/
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public int variant() {
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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)))
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& (leastSigBits >> 63));
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}
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/**
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* The timestamp value associated with this UUID.
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*
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* <p> The 60 bit timestamp value is constructed from the time_low,
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* time_mid, and time_hi fields of this {@code UUID}. The resulting
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* timestamp is measured in 100-nanosecond units since midnight,
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* October 15, 1582 UTC.
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*
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* <p> The timestamp value is only meaningful in a time-based UUID, which
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* has version type 1. If this {@code UUID} is not a time-based UUID then
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* this method throws UnsupportedOperationException.
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*
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* @throws UnsupportedOperationException
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* If this UUID is not a version 1 UUID
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* @return The timestamp of this {@code UUID}.
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*/
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public long timestamp() {
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if (version() != 1) {
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throw new UnsupportedOperationException("Not a time-based UUID");
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}
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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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* The clock sequence value associated with this UUID.
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*
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* <p> The 14 bit clock sequence value is constructed from the clock
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* sequence field of this UUID. The clock sequence field is used to
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* guarantee temporal uniqueness in a time-based UUID.
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*
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* <p> The {@code clockSequence} value is only meaningful in a time-based
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* UUID, which has version type 1. If this UUID is not a time-based UUID
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* then this method throws UnsupportedOperationException.
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*
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* @return The clock sequence of this {@code UUID}
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*
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* @throws UnsupportedOperationException
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* If this UUID is not a version 1 UUID
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*/
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public int clockSequence() {
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if (version() != 1) {
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throw new UnsupportedOperationException("Not a time-based UUID");
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}
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return (int)((leastSigBits & 0x3FFF000000000000L) >>> 48);
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}
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/**
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* The node value associated with this UUID.
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*
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* <p> The 48 bit node value is constructed from the node field of this
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* UUID. This field is intended to hold the IEEE 802 address of the machine
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* that generated this UUID to guarantee spatial uniqueness.
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*
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* <p> The node value is only meaningful in a time-based UUID, which has
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* version type 1. If this UUID is not a time-based UUID then this method
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* throws UnsupportedOperationException.
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*
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* @return The node value of this {@code UUID}
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*
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* @throws UnsupportedOperationException
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* If this UUID is not a version 1 UUID
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*/
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public long node() {
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if (version() != 1) {
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throw new UnsupportedOperationException("Not a time-based UUID");
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}
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return leastSigBits & 0x0000FFFFFFFFFFFFL;
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}
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// Object Inherited Methods
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/**
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* Returns a {@code String} object representing this {@code UUID}.
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*
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* <p> The UUID string representation is as described by this BNF:
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* <blockquote><pre>
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* {@code
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|
* UUID = <time_low> "-" <time_mid> "-"
|
|
* <time_high_and_version> "-"
|
|
* <variant_and_sequence> "-"
|
|
* <node>
|
|
* time_low = 4*<hexOctet>
|
|
* time_mid = 2*<hexOctet>
|
|
* time_high_and_version = 2*<hexOctet>
|
|
* variant_and_sequence = 2*<hexOctet>
|
|
* node = 6*<hexOctet>
|
|
* hexOctet = <hexDigit><hexDigit>
|
|
* hexDigit =
|
|
* "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
|
|
* | "a" | "b" | "c" | "d" | "e" | "f"
|
|
* | "A" | "B" | "C" | "D" | "E" | "F"
|
|
* }</pre></blockquote>
|
|
*
|
|
* @return A string representation of this {@code UUID}
|
|
*/
|
|
@Override
|
|
public String toString() {
|
|
// Android-changed: using old implementation.
|
|
// return jla.fastUUID(leastSigBits, mostSigBits);
|
|
return (digits(mostSigBits >> 32, 8) + "-" +
|
|
digits(mostSigBits >> 16, 4) + "-" +
|
|
digits(mostSigBits, 4) + "-" +
|
|
digits(leastSigBits >> 48, 4) + "-" +
|
|
digits(leastSigBits, 12));
|
|
}
|
|
|
|
/** Returns val represented by the specified number of hex digits. */
|
|
private static String digits(long val, int digits) {
|
|
long hi = 1L << (digits * 4);
|
|
return Long.toHexString(hi | (val & (hi - 1))).substring(1);
|
|
}
|
|
|
|
/**
|
|
* Returns a hash code for this {@code UUID}.
|
|
*
|
|
* @return A hash code value for this {@code UUID}
|
|
*/
|
|
@Override
|
|
public int hashCode() {
|
|
long hilo = mostSigBits ^ leastSigBits;
|
|
return ((int)(hilo >> 32)) ^ (int) hilo;
|
|
}
|
|
|
|
/**
|
|
* Compares this object to the specified object. The result is {@code
|
|
* true} if and only if the argument is not {@code null}, is a {@code UUID}
|
|
* object, has the same variant, and contains the same value, bit for bit,
|
|
* as this {@code UUID}.
|
|
*
|
|
* @param obj
|
|
* The object to be compared
|
|
*
|
|
* @return {@code true} if the objects are the same; {@code false}
|
|
* otherwise
|
|
*/
|
|
@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
|
|
|
|
/**
|
|
* Compares this UUID with the specified UUID.
|
|
*
|
|
* <p> The first of two UUIDs is greater than the second if the most
|
|
* significant field in which the UUIDs differ is greater for the first
|
|
* UUID.
|
|
*
|
|
* @param val
|
|
* {@code UUID} to which this {@code UUID} is to be compared
|
|
*
|
|
* @return -1, 0 or 1 as this {@code UUID} is less than, equal to, or
|
|
* greater than {@code val}
|
|
*
|
|
*/
|
|
@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))));
|
|
}
|
|
}
|