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-/*
- * UUID.java
- *
- * Created 07.02.2003
- *
- * eaio: UUID - an implementation of the UUID specification
- * Copyright (c) 2003-2009 Johann Burkard (jb@eaio.com) http://eaio.com.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
- * NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- */
-package com.eaio.uuid;
-
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.io.Serializable;
-
-import org.omg.CORBA.portable.IDLEntity;
-
-import com.eaio.util.lang.Hex;
-
-/**
- * Creates UUIDs according to the DCE Universal Token Identifier specification.
- * <p>
- * All you need to know:
- * <pre>
- * UUID u = new UUID();
- * </pre>
- *
- * @see <a href="http://www.opengroup.org/onlinepubs/9629399/apdxa.htm">
- * http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
- * </a>
- * @see <a href="http://www.uddi.org/pubs/draft-leach-uuids-guids-01.txt">
- * http://www.uddi.org/pubs/draft-leach-uuids-guids-01.txt
- * </a>
- * @see <a href="http://johannburkard.de/software/uuid/">UUID</a>
- * @author <a href="mailto:jb@eaio.de">Johann Burkard</a>
- * @version $Id: UUID.java 1888 2009-03-15 12:43:24Z johann $
- */
-public class UUID implements Comparable<UUID>, Serializable, Cloneable,
- IDLEntity {
-
- /**
- * Hasn't ever changed between versions.
- */
- static final long serialVersionUID = 7435962790062944603L;
-
- /**
- * The time field of the UUID.
- *
- * @serial
- */
- public long time;
-
- /**
- * The clock sequence and node field of the UUID.
- *
- * @serial
- */
- public long clockSeqAndNode;
-
- /**
- * Constructor for UUID. Constructs a new, unique UUID.
- *
- * @see UUIDGen#newTime()
- * @see UUIDGen#getClockSeqAndNode()
- */
- public UUID() {
- this(UUIDGen.newTime(), UUIDGen.getClockSeqAndNode());
- }
-
- /**
- * Constructor for UUID. Constructs a UUID from two <code>long</code> values.
- *
- * @param time the upper 64 bits
- * @param clockSeqAndNode the lower 64 bits
- */
- public UUID(long time, long clockSeqAndNode) {
- this.time = time;
- this.clockSeqAndNode = clockSeqAndNode;
- }
-
- /**
- * Copy constructor for UUID. Values of the given UUID are copied.
- *
- * @param u the UUID, may not be <code>null</code>
- */
- public UUID(UUID u) {
- this(u.time, u.clockSeqAndNode);
- }
-
- /**
- * Parses a textual representation of a UUID.
- * <p>
- * No validation is performed. If the {@link CharSequence} is shorter than 36 characters,
- * {@link ArrayIndexOutOfBoundsException}s will be thrown.
- *
- * @param s the {@link CharSequence}, may not be <code>null</code>
- */
- public UUID(CharSequence s) {
- this(Hex.parseLong(s.subSequence(0, 18)), Hex.parseLong(s.subSequence(
- 19, 36)));
- }
-
- /**
- * Compares this UUID to another Object. Throws a {@link ClassCastException} if
- * the other Object is not an instance of the UUID class. Returns a value
- * smaller than zero if the other UUID is "larger" than this UUID and a value
- * larger than zero if the other UUID is "smaller" than this UUID.
- *
- * @param t the other UUID, may not be <code>null</code>
- * @return a value &lt; 0, 0 or a value &gt; 0
- * @see java.lang.Comparable#compareTo(java.lang.Object)
- * @throws ClassCastException
- */
- public int compareTo(UUID t) {
- if (this == t) {
- return 0;
- }
- if (time > t.time) {
- return 1;
- }
- if (time < t.time) {
- return -1;
- }
- if (clockSeqAndNode > t.clockSeqAndNode) {
- return 1;
- }
- if (clockSeqAndNode < t.clockSeqAndNode) {
- return -1;
- }
- return 0;
- }
-
- /**
- * Tweaked Serialization routine.
- *
- * @param out the ObjectOutputStream
- * @throws IOException
- */
- private void writeObject(ObjectOutputStream out) throws IOException {
- out.writeLong(time);
- out.writeLong(clockSeqAndNode);
- }
-
- /**
- * Tweaked Serialization routine.
- *
- * @param in the ObjectInputStream
- * @throws IOException
- */
- private void readObject(ObjectInputStream in) throws IOException {
- time = in.readLong();
- clockSeqAndNode = in.readLong();
- }
-
- /**
- * Returns this UUID as a String.
- *
- * @return a String, never <code>null</code>
- * @see java.lang.Object#toString()
- * @see #toAppendable(Appendable)
- */
- @Override
- public final String toString() {
- return toAppendable(null).toString();
- }
-
- /**
- * Appends a String representation of this to the given {@link StringBuffer} or
- * creates a new one if none is given.
- *
- * @param in the StringBuffer to append to, may be <code>null</code>
- * @return a StringBuffer, never <code>null</code>
- * @see #toAppendable(Appendable)
- */
- public StringBuffer toStringBuffer(StringBuffer in) {
- StringBuffer out = in;
- if (out == null) {
- out = new StringBuffer(36);
- }
- else {
- out.ensureCapacity(out.length() + 36);
- }
- return (StringBuffer) toAppendable(out);
- }
-
- /**
- * Appends a String representation of this object to the given {@link Appendable} object.
- * <p>
- * For reasons I'll probably never understand, Sun has decided to have a number of I/O classes implement
- * Appendable which forced them to destroy an otherwise nice and simple interface with {@link IOException}s.
- * <p>
- * I decided to ignore any possible IOExceptions in this method.
- *
- * @param a the Appendable object, may be <code>null</code>
- * @return an Appendable object, defaults to a {@link StringBuilder} if <code>a</code> is <code>null</code>
- */
- public Appendable toAppendable(Appendable a) {
- Appendable out = a;
- if (out == null) {
- out = new StringBuilder(36);
- }
- try {
- Hex.append(out, (int) (time >> 32)).append('-');
- Hex.append(out, (short) (time >> 16)).append('-');
- Hex.append(out, (short) time).append('-');
- Hex.append(out, (short) (clockSeqAndNode >> 48)).append('-');
- Hex.append(out, clockSeqAndNode, 12);
- }
- catch (IOException ex) {
- // What were they thinking?
- }
- return out;
- }
-
- /**
- * Returns a hash code of this UUID. The hash code is calculated by XOR'ing the
- * upper 32 bits of the time and clockSeqAndNode fields and the lower 32 bits of
- * the time and clockSeqAndNode fields.
- *
- * @return an <code>int</code> representing the hash code
- * @see java.lang.Object#hashCode()
- */
- @Override
- public int hashCode() {
- return (int) ((time >> 32) ^ time ^ (clockSeqAndNode >> 32) ^ clockSeqAndNode);
- }
-
- /**
- * Clones this UUID.
- *
- * @return a new UUID with identical values, never <code>null</code>
- */
- @Override
- public Object clone() {
- try {
- return super.clone();
- }
- catch (CloneNotSupportedException ex) {
- // One of Sun's most epic fails.
- return null;
- }
- }
-
- /**
- * Returns the time field of the UUID (upper 64 bits).
- *
- * @return the time field
- */
- public final long getTime() {
- return time;
- }
-
- /**
- * Returns the clock and node field of the UUID (lower 64 bits).
- *
- * @return the clockSeqAndNode field
- */
- public final long getClockSeqAndNode() {
- return clockSeqAndNode;
- }
-
- /**
- * Compares two Objects for equality.
- *
- * @see java.lang.Object#equals(Object)
- * @param obj the Object to compare this UUID with, may be <code>null</code>
- * @return <code>true</code> if the other Object is equal to this UUID,
- * <code>false</code> if not
- */
- @Override
- public boolean equals(Object obj) {
- if (!(obj instanceof UUID)) {
- return false;
- }
- return compareTo((UUID) obj) == 0;
- }
-
- /**
- * Returns the nil UUID (a UUID whose values are both set to zero).
- * <p>
- * Starting with version 2.0, this method does return a new UUID instance every
- * time it is called. Earlier versions returned one instance. This has now been
- * changed because this UUID has public, non-final instance fields. Returning a
- * new instance is therefore more safe.
- *
- * @return a nil UUID, never <code>null</code>
- */
- public static UUID nilUUID() {
- return new UUID(0, 0);
- }
-
-}