508 lines
17 KiB
Plaintext
508 lines
17 KiB
Plaintext
package kr.co.i4way.manage.util;
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import java.io.Serializable;
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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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/**
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*
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* A class that represents an immutable universally unique identifier (UUID). A
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* UUID represents a 128-bit value.
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*
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* <p>
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* There exist different variants of these global identifiers. The methods of
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* 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>
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* 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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*
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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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*
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* The least significant long consists of the following unsigned fields:
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*
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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>
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* The variant field contains a value which identifies the layout of the
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* <tt>UUID</tt>. The bit layout described above is valid only for a
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* <tt>UUID</tt> with a variant value of 2, which indicates the Leach-Salz
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* variant.
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*
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* <p>
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* The version field holds a value that describes the type of this <tt>UUID</tt>.
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* There are four different basic types of UUIDs: time-based, DCE security,
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* name-based, and randomly generated UUIDs. These types have a version value of
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* 1, 2, 3 and 4, respectively.
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*
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* <p>
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* For more information including algorithms used to create <tt>UUID</tt>s,
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* see the Internet-Draft <a
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* href="http://www.ietf.org/internet-drafts/draft-mealling-uuid-urn-03.txt">UUIDs
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* and GUIDs</a> or the standards body definition at <a
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* href="http://www.iso.ch/cate/d2229.html">ISO/IEC 11578:1996</a>.
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*
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* @version 1.14, 07/12/04
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* @since 1.5
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*/
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@SuppressWarnings("serial")
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public class FormBasedUUID implements Serializable {
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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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/*
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* The version number associated with this UUID. Computed on demand.
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*/
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private transient int version = -1;
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/*
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* The variant number associated with this UUID. Computed on demand.
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*/
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private transient int variant = -1;
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/*
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* The timestamp associated with this UUID. Computed on demand.
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*/
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private transient volatile long timestamp = -1;
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/*
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* The clock sequence associated with this UUID. Computed on demand.
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*/
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private transient int sequence = -1;
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/*
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* The node number associated with this UUID. Computed on demand.
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*/
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private transient long node = -1;
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/*
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* The hashcode of this UUID. Computed on demand.
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*/
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private transient int hashCode = -1;
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/*
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* The random number generator used by this class to create random based
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* UUIDs.
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*/
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private static volatile SecureRandom numberGenerator = null;
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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 FormBasedUUID(byte[] data) {
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long msb = 0;
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long lsb = 0;
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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 <tt>UUID</tt> using the specified data.
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* <tt>mostSigBits</tt> is used for the most significant 64 bits of the
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* <tt>UUID</tt> and <tt>leastSigBits</tt> becomes the least significant
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* 64 bits of the <tt>UUID</tt>.
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*
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* @param mostSigBits
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* @param leastSigBits
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*/
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public FormBasedUUID(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</code> is generated using a cryptographically strong
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* pseudo random number generator.
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*
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* @return a randomly generated <tt>UUID</tt>.
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*/
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public static FormBasedUUID randomUUID() {
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SecureRandom ng = numberGenerator;
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if (ng == null) {
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numberGenerator = ng = new SecureRandom();
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}
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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 FormBasedUUID(randomBytes);
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}
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/**
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* Static factory to retrieve a type 3 (name based) <tt>UUID</tt> 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 <tt>UUID</tt>.
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* @return a <tt>UUID</tt> generated from the specified array.
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*/
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public static FormBasedUUID nameUUIDFromBytes(byte[] name) {
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MessageDigest md;
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try {
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// 2011.10.10 보안점검 후속조치 암호화 알고리즘 변경(MD5 -> SHA-256)
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//md = MessageDigest.getInstance("MD5");
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md = MessageDigest.getInstance("SHA-256");
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} catch (NoSuchAlgorithmException nsae) {
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//throw new InternalError("MD5 not supported");
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throw new InternalError("SHA-256 not supported");
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}
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// 2011.10.10 보안점검 후속조치
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if (md == null) {
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throw new RuntimeException("MessageDigest is null!!");
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}
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byte[] sha = md.digest(name);
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byte[] md5Bytes = new byte[8];
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System.arraycopy(sha, 0, md5Bytes, 0, 8);
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//2011.10.10 보안점검 후속조치 끝
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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 FormBasedUUID(md5Bytes);
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}
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/**
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* Creates a <tt>UUID</tt> 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 <tt>UUID</tt>.
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* @return a <tt>UUID</tt> with the specified value.
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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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public static FormBasedUUID fromString(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 FormBasedUUID(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 <tt>UUID</tt>. The version
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* number describes how this <tt>UUID</tt> was generated.
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*
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* The version number has the following meaning:
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* <p>
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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 <tt>UUID</tt>.
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*/
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public int version() {
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if (version < 0) {
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// Version is bits masked by 0x000000000000F000 in MS long
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version = (int) ((mostSigBits >> 12) & 0x0f);
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}
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return version;
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}
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/**
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* The variant number associated with this <tt>UUID</tt>. The variant
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* number describes the layout of the <tt>UUID</tt>.
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*
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* The variant number has the following meaning:
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* <p>
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* <ul>
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* <li>0 Reserved for NCS backward compatibility
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* <li>2 The Leach-Salz variant (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 <tt>UUID</tt>.
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*/
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public int variant() {
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if (variant < 0) {
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// This field is composed of a varying number of bits
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if ((leastSigBits >>> 63) == 0) {
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variant = 0;
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} else if ((leastSigBits >>> 62) == 2) {
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variant = 2;
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} else {
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variant = (int) (leastSigBits >>> 61);
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}
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}
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return variant;
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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>
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* The 60 bit timestamp value is constructed from the time_low, time_mid,
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* and time_hi fields of this <tt>UUID</tt>. The resulting timestamp is
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* measured in 100-nanosecond units since midnight, October 15, 1582 UTC.
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* <p>
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*
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* The timestamp value is only meaningful in a time-based UUID, which has
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* version type 1. If this <tt>UUID</tt> 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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*/
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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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long result = timestamp;
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if (result < 0) {
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result = (mostSigBits & 0x0000000000000FFFL) << 48;
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result |= ((mostSigBits >> 16) & 0xFFFFL) << 32;
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result |= mostSigBits >>> 32;
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timestamp = result;
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}
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return result;
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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>
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* The 14 bit clock sequence value is constructed from the clock sequence
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* field of this UUID. The clock sequence field is used to guarantee
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* temporal uniqueness in a time-based UUID.
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* <p>
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*
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* The clockSequence value is only meaningful in a time-based UUID, which
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* has version type 1. If this UUID is not a time-based UUID then this
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* method throws UnsupportedOperationException.
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*
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* @return the clock sequence of this <tt>UUID</tt>.
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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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if (sequence < 0) {
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sequence = (int) ((leastSigBits & 0x3FFF000000000000L) >>> 48);
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}
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return sequence;
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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>
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* The 48 bit node value is constructed from the node field of this UUID.
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* This field is intended to hold the IEEE 802 address of the machine that
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* generated this UUID to guarantee spatial uniqueness.
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* <p>
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*
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* The node value is only meaningful in a time-based UUID, which has version
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* type 1. If this UUID is not a time-based UUID then this method throws
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* UnsupportedOperationException.
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*
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* @return the node value of this <tt>UUID</tt>.
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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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if (node < 0) {
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node = leastSigBits & 0x0000FFFFFFFFFFFFL;
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}
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return node;
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}
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// Object Inherited Methods
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/**
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* Returns a <code>String</code> object representing this
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* <code>UUID</code>.
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*
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* <p>
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* The UUID string representation is as described by this BNF :
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*
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* <pre>
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* UUID = <time_low> "-" <time_mid> "-"
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* <time_high_and_version> "-"
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* <variant_and_sequence> "-"
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* <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 =
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* "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
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* | "a" | "b" | "c" | "d" | "e" | "f"
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* | "A" | "B" | "C" | "D" | "E" | "F"
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* </pre>
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*
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* @return a string representation of this <tt>UUID</tt>.
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*/
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public String toString() {
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return (digits(mostSigBits >> 32, 8) + "-"
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+ digits(mostSigBits >> 16, 4) + "-" + digits(mostSigBits, 4)
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+ "-" + digits(leastSigBits >> 48, 4) + "-" + digits(
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leastSigBits, 12));
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}
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/** Returns val represented by the specified number of hex digits. */
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private static String digits(long val, int digits) {
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long hi = 1L << (digits * 4);
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return Long.toHexString(hi | (val & (hi - 1))).substring(1);
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}
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/**
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* Returns a hash code for this <code>UUID</code>.
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*
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* @return a hash code value for this <tt>UUID</tt>.
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*/
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public int hashCode() {
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if (hashCode == -1) {
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hashCode = (int) ((mostSigBits >> 32) ^ mostSigBits
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^ (leastSigBits >> 32) ^ leastSigBits);
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}
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return hashCode;
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}
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/**
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* Compares this object to the specified object. The result is <tt>true</tt>
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* if and only if the argument is not <tt>null</tt>, is a <tt>UUID</tt>
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* object, has the same variant, and contains the same value, bit for bit,
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* as this <tt>UUID</tt>.
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*
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* @param obj
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* the object to compare with.
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* @return <code>true</code> if the objects are the same;
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* <code>false</code> otherwise.
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*/
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public boolean equals(Object obj) {
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// 보안 취약점 점검 지적사항 반영 시작
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if (obj == null)
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return false;
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// 보안 취약점 점검 지적사항 반영 시작 끝
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if (!(obj instanceof FormBasedUUID))
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return false;
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if (((FormBasedUUID) obj).variant() != this.variant())
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return false;
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FormBasedUUID id = (FormBasedUUID) obj;
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return (mostSigBits == id.mostSigBits && leastSigBits == id.leastSigBits);
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}
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// Comparison Operations
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/**
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* Compares this UUID with the specified UUID.
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*
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* <p>
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* The first of two UUIDs follows the second if the most significant field
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* in which the UUIDs differ is greater for the first UUID.
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*
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* @param val
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* <tt>UUID</tt> to which this <tt>UUID</tt> is to be
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* compared.
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* @return -1, 0 or 1 as this <tt>UUID</tt> is less than, equal to, or
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* greater than <tt>val</tt>.
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*/
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public int compareTo(FormBasedUUID val) {
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// The ordering is intentionally set up so that the UUIDs
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// can simply be numerically compared as two numbers
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return (this.mostSigBits < val.mostSigBits ? -1
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: (this.mostSigBits > val.mostSigBits ? 1
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: (this.leastSigBits < val.leastSigBits ? -1
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: (this.leastSigBits > val.leastSigBits ? 1 : 0))));
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}
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/**
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* Reconstitute the <tt>UUID</tt> instance from a stream (that is,
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* deserialize it). This is necessary to set the transient fields to their
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* correct uninitialized value so they will be recomputed on demand.
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*/
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private void readObject(java.io.ObjectInputStream in)
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throws java.io.IOException, ClassNotFoundException {
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in.defaultReadObject();
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// Set "cached computation" fields to their initial values
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version = -1;
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variant = -1;
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timestamp = -1;
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sequence = -1;
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node = -1;
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hashCode = -1;
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}
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} |