424 lines
15 KiB
JavaScript
424 lines
15 KiB
JavaScript
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/*
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Copyright (c) 2004-2006, The Dojo Foundation
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All Rights Reserved.
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Licensed under the Academic Free License version 2.1 or above OR the
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modified BSD license. For more information on Dojo licensing, see:
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http://dojotoolkit.org/community/licensing.shtml
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*/
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dojo.provide("dojo.uuid.Uuid");
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dojo.require("dojo.lang.*");
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// -------------------------------------------------------------------
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// Constructor
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// -------------------------------------------------------------------
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/**
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* The Uuid class offers methods for inspecting existing UUIDs.
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*
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* Examples:
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* <pre>
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* var uuid;
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* uuid = new dojo.uuid.Uuid("3b12f1df-5232-4804-897e-917bf397618a");
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* uuid = new dojo.uuid.Uuid(); // "00000000-0000-0000-0000-000000000000"
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* uuid = new dojo.uuid.Uuid(dojo.uuid.RandomGenerator);
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* uuid = new dojo.uuid.Uuid(dojo.uuid.TimeBasedGenerator);
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*
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* dojo.uuid.Uuid.setGenerator(dojo.uuid.RandomGenerator);
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* uuid = new dojo.uuid.Uuid();
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* dojo.lang.assert(!uuid.isEqual(dojo.uuid.Uuid.NIL_UUID));
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* </pre>
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*
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* @scope public instance constructor
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* @param uuidString A 36-character string that conforms to the UUID spec.
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* @param generator A UUID generator, such as dojo.uuid.TimeBasedGenerator.
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*/
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dojo.uuid.Uuid = function(input) {
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this._uuidString = dojo.uuid.Uuid.NIL_UUID;
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if (input) {
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if (dojo.lang.isString(input)) {
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this._uuidString = input.toLowerCase();
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dojo.lang.assert(this.isValid());
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} else {
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if (dojo.lang.isObject(input) && input.generate) {
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var generator = input;
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this._uuidString = generator.generate();
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dojo.lang.assert(this.isValid());
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} else {
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// we got passed something other than a string
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dojo.lang.assert(false, "The dojo.uuid.Uuid() constructor must be initializated with a UUID string.");
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}
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}
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} else {
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var ourGenerator = dojo.uuid.Uuid.getGenerator();
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if (ourGenerator) {
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this._uuidString = ourGenerator.generate();
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dojo.lang.assert(this.isValid());
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}
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}
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};
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// -------------------------------------------------------------------
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// Public constants
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// -------------------------------------------------------------------
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dojo.uuid.Uuid.NIL_UUID = "00000000-0000-0000-0000-000000000000";
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dojo.uuid.Uuid.Version = {
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UNKNOWN: 0,
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TIME_BASED: 1,
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DCE_SECURITY: 2,
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NAME_BASED_MD5: 3,
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RANDOM: 4,
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NAME_BASED_SHA1: 5 };
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dojo.uuid.Uuid.Variant = {
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NCS: "0",
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DCE: "10",
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MICROSOFT: "110",
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UNKNOWN: "111" };
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dojo.uuid.Uuid.HEX_RADIX = 16;
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// -------------------------------------------------------------------
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// Public class methods
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// -------------------------------------------------------------------
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/**
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* Given two UUIDs to compare, this method returns 0, 1, or -1.
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* This method is designed to be used by sorting routines, like
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* the JavaScript built-in Array sort() method.
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* This implementation is intended to match the sample
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* implementation in IETF RFC 4122:
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* http://www.ietf.org/rfc/rfc4122.txt
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*
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* Example:
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* <pre>
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* var generator = dojo.uuid.TimeBasedGenerator;
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* var a = new dojo.uuid.Uuid(generator);
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* var b = new dojo.uuid.Uuid(generator);
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* var c = new dojo.uuid.Uuid(generator);
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* var array = new Array(a, b, c);
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* array.sort(dojo.uuid.Uuid.compare);
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* </pre>
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*
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* @param uuidOne A dojo.uuid.Uuid instance, or a string representing a UUID.
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* @param uuidTwo A dojo.uuid.Uuid instance, or a string representing a UUID.
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* @return Returns either 0, 1, or -1.
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*/
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dojo.uuid.Uuid.compare = function(uuidOne, uuidTwo) {
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var uuidStringOne = uuidOne.toString();
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var uuidStringTwo = uuidTwo.toString();
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if (uuidStringOne > uuidStringTwo) return 1;
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if (uuidStringOne < uuidStringTwo) return -1;
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return 0;
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};
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/**
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* Sets the default generator, which will be used by the
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* "new dojo.uuid.Uuid()" constructor if no parameters
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* are passed in.
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*
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* @param generator A UUID generator, such as dojo.uuid.TimeBasedGenerator.
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* @return Returns true or false. True if this UUID is equal to the otherUuid.
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*/
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dojo.uuid.Uuid.setGenerator = function(generator) {
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dojo.lang.assert(!generator || (dojo.lang.isObject(generator) && generator.generate));
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dojo.uuid.Uuid._ourGenerator = generator;
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};
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/**
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* Returns the default generator. See setGenerator().
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*
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* @return A UUID generator, such as dojo.uuid.TimeBasedGenerator.
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*/
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dojo.uuid.Uuid.getGenerator = function(generator) {
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return dojo.uuid.Uuid._ourGenerator;
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};
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// -------------------------------------------------------------------
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// Public instance methods
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// -------------------------------------------------------------------
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/**
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* Returns a 36-character string representing the UUID, such
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* as "3b12f1df-5232-4804-897e-917bf397618a".
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*
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* Examples:
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* <pre>
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* var uuid = new dojo.uuid.Uuid(dojo.uuid.TimeBasedGenerator);
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* var s;
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* s = uuid.toString(); // eb529fec-6498-11d7-b236-000629ba5445
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* s = uuid.toString('{}'); // {eb529fec-6498-11d7-b236-000629ba5445}
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* s = uuid.toString('()'); // (eb529fec-6498-11d7-b236-000629ba5445)
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* s = uuid.toString('""'); // "eb529fec-6498-11d7-b236-000629ba5445"
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* s = uuid.toString("''"); // 'eb529fec-6498-11d7-b236-000629ba5445'
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* s = uuid.toString('!-'); // eb529fec649811d7b236000629ba5445
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* s = uuid.toString('urn'); // urn:uuid:eb529fec-6498-11d7-b236-000629ba5445
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* </pre>
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*
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* @param uuidOne A dojo.uuid.Uuid instance, or a string representing a UUID.
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* @return Returns a standard 36-character UUID string, or something similar.
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*/
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dojo.uuid.Uuid.prototype.toString = function(format) {
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if (format) {
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switch (format) {
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case '{}':
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return '{' + this._uuidString + '}';
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break;
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case '()':
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return '(' + this._uuidString + ')';
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break;
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case '""':
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return '"' + this._uuidString + '"';
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break;
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case "''":
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return "'" + this._uuidString + "'";
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break;
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case 'urn':
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return 'urn:uuid:' + this._uuidString;
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break;
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case '!-':
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return this._uuidString.split('-').join('');
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break;
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default:
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// we got passed something other than what we expected
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dojo.lang.assert(false, "The toString() method of dojo.uuid.Uuid was passed a bogus format.");
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}
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} else {
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return this._uuidString;
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}
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};
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/**
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* Compares this UUID to another UUID, and returns 0, 1, or -1.
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* This implementation is intended to match the sample
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* implementation in IETF RFC 4122:
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* http://www.ietf.org/rfc/rfc4122.txt
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*
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* @param otherUuid A dojo.uuid.Uuid instance, or a string representing a UUID.
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* @return Returns either 0, 1, or -1.
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*/
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dojo.uuid.Uuid.prototype.compare = function(otherUuid) {
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return dojo.uuid.Uuid.compare(this, otherUuid);
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};
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/**
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* Returns true if this UUID is equal to the otherUuid, or
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* false otherwise.
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*
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* @param otherUuid A dojo.uuid.Uuid instance, or a string representing a UUID.
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* @return Returns true or false. True if this UUID is equal to the otherUuid.
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*/
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dojo.uuid.Uuid.prototype.isEqual = function(otherUuid) {
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return (this.compare(otherUuid) == 0);
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};
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/**
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* Returns true if the UUID was initialized with a valid value.
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*
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* @return True if the UUID is valid, or false if it is not.
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*/
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dojo.uuid.Uuid.prototype.isValid = function() {
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try {
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dojo.lang.assertType(this._uuidString, String);
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dojo.lang.assert(this._uuidString.length == 36);
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dojo.lang.assert(this._uuidString == this._uuidString.toLowerCase());
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var arrayOfParts = this._uuidString.split("-");
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dojo.lang.assert(arrayOfParts.length == 5);
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dojo.lang.assert(arrayOfParts[0].length == 8);
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dojo.lang.assert(arrayOfParts[1].length == 4);
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dojo.lang.assert(arrayOfParts[2].length == 4);
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dojo.lang.assert(arrayOfParts[3].length == 4);
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dojo.lang.assert(arrayOfParts[4].length == 12);
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for (var i in arrayOfParts) {
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var part = arrayOfParts[i];
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var integer = parseInt(part, dojo.uuid.Uuid.HEX_RADIX);
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dojo.lang.assert(isFinite(integer));
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}
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return true;
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} catch (e) {
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return false;
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}
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};
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/**
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* Returns a variant code that indicates what type of UUID this is.
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* For example:
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* <pre>
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* var uuid = new dojo.uuid.Uuid("3b12f1df-5232-4804-897e-917bf397618a");
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* var variant = uuid.getVariant();
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* dojo.lang.assert(variant == dojo.uuid.Uuid.Variant.DCE);
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* </pre>
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*
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* @return Returns one of the enumarted dojo.uuid.Uuid.Variant values.
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*/
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dojo.uuid.Uuid.prototype.getVariant = function() {
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// "3b12f1df-5232-4804-897e-917bf397618a"
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// ^
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// |
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// (variant "10__" == DCE)
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var variantCharacter = this._uuidString.charAt(19);
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var variantNumber = parseInt(variantCharacter, dojo.uuid.Uuid.HEX_RADIX);
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dojo.lang.assert((variantNumber >= 0) && (variantNumber <= 16));
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if (!dojo.uuid.Uuid._ourVariantLookupTable) {
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var Variant = dojo.uuid.Uuid.Variant;
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var lookupTable = [];
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lookupTable[0x0] = Variant.NCS; // 0000
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lookupTable[0x1] = Variant.NCS; // 0001
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lookupTable[0x2] = Variant.NCS; // 0010
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lookupTable[0x3] = Variant.NCS; // 0011
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lookupTable[0x4] = Variant.NCS; // 0100
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lookupTable[0x5] = Variant.NCS; // 0101
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lookupTable[0x6] = Variant.NCS; // 0110
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lookupTable[0x7] = Variant.NCS; // 0111
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lookupTable[0x8] = Variant.DCE; // 1000
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lookupTable[0x9] = Variant.DCE; // 1001
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lookupTable[0xA] = Variant.DCE; // 1010
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lookupTable[0xB] = Variant.DCE; // 1011
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lookupTable[0xC] = Variant.MICROSOFT; // 1100
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lookupTable[0xD] = Variant.MICROSOFT; // 1101
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lookupTable[0xE] = Variant.UNKNOWN; // 1110
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lookupTable[0xF] = Variant.UNKNOWN; // 1111
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dojo.uuid.Uuid._ourVariantLookupTable = lookupTable;
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}
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return dojo.uuid.Uuid._ourVariantLookupTable[variantNumber];
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};
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/**
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* Returns a version number that indicates what type of UUID this is.
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* For example:
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* <pre>
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* var uuid = new dojo.uuid.Uuid("b4308fb0-86cd-11da-a72b-0800200c9a66");
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* var version = uuid.getVersion();
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* dojo.lang.assert(version == dojo.uuid.Uuid.Version.TIME_BASED);
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* </pre>
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*
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* @return Returns one of the enumerated dojo.uuid.Uuid.Version values.
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* @throws Throws an Error if this is not a DCE Variant UUID.
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*/
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dojo.uuid.Uuid.prototype.getVersion = function() {
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if (!this._versionNumber) {
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var errorMessage = "Called getVersion() on a dojo.uuid.Uuid that was not a DCE Variant UUID.";
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dojo.lang.assert(this.getVariant() == dojo.uuid.Uuid.Variant.DCE, errorMessage);
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// "b4308fb0-86cd-11da-a72b-0800200c9a66"
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// ^
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// |
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// (version 1 == TIME_BASED)
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var versionCharacter = this._uuidString.charAt(14);
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this._versionNumber = parseInt(versionCharacter, dojo.uuid.Uuid.HEX_RADIX);
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}
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return this._versionNumber;
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};
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/**
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* If this is a version 1 UUID (a time-based UUID), this method returns a
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* 12-character string with the "node" or "pseudonode" portion of the UUID,
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* which is the rightmost 12 characters.
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* Throws an Error if this is not a version 1 UUID.
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*
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* @return Returns a 12-character string, which will look something like "917bf397618a".
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* @throws Throws an Error if this is not a version 1 UUID.
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*/
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dojo.uuid.Uuid.prototype.getNode = function() {
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if (!this._nodeString) {
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var errorMessage = "Called getNode() on a dojo.uuid.Uuid that was not a TIME_BASED UUID.";
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dojo.lang.assert(this.getVersion() == dojo.uuid.Uuid.Version.TIME_BASED, errorMessage);
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var arrayOfStrings = this._uuidString.split('-');
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this._nodeString = arrayOfStrings[4];
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}
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return this._nodeString;
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};
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/**
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* If this is a version 1 UUID (a time-based UUID), this method returns
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* the timestamp value encoded in the UUID. The caller can ask for the
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* timestamp to be returned either as a JavaScript Date object or as a
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* 15-character string of hex digits.
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* Throws an Error if this is not a version 1 UUID.
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*
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* Examples:
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* <pre>
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* var uuid = new dojo.uuid.Uuid("b4308fb0-86cd-11da-a72b-0800200c9a66");
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* var date, string, hexString;
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* date = uuid.getTimestamp(); // returns a JavaScript Date
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* date = uuid.getTimestamp(Date); //
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* string = uuid.getTimestamp(String); // "Mon, 16 Jan 2006 20:21:41 GMT"
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* hexString = uuid.getTimestamp("hex"); // "1da86cdb4308fb0"
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* </pre>
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*
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* @return Returns the timestamp value as a JavaScript Date object or a 15-character string of hex digits.
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* @throws Throws an Error if this is not a version 1 UUID.
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*/
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dojo.uuid.Uuid.prototype.getTimestamp = function(returnType) {
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var errorMessage = "Called getTimestamp() on a dojo.uuid.Uuid that was not a TIME_BASED UUID.";
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dojo.lang.assert(this.getVersion() == dojo.uuid.Uuid.Version.TIME_BASED, errorMessage);
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if (!returnType) {returnType = null};
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switch (returnType) {
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case "string":
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case String:
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return this.getTimestamp(Date).toUTCString();
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break;
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case "hex":
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// Return a 15-character string of hex digits containing the
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// timestamp for this UUID, with the high-order bits first.
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if (!this._timestampAsHexString) {
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var arrayOfStrings = this._uuidString.split('-');
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var hexTimeLow = arrayOfStrings[0];
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var hexTimeMid = arrayOfStrings[1];
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var hexTimeHigh = arrayOfStrings[2];
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// Chop off the leading "1" character, which is the UUID
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// version number for time-based UUIDs.
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hexTimeHigh = hexTimeHigh.slice(1);
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this._timestampAsHexString = hexTimeHigh + hexTimeMid + hexTimeLow;
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dojo.lang.assert(this._timestampAsHexString.length == 15);
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}
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return this._timestampAsHexString;
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break;
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case null: // no returnType was specified, so default to Date
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case "date":
|
||
|
case Date:
|
||
|
// Return a JavaScript Date object.
|
||
|
if (!this._timestampAsDate) {
|
||
|
var GREGORIAN_CHANGE_OFFSET_IN_HOURS = 3394248;
|
||
|
|
||
|
var arrayOfParts = this._uuidString.split('-');
|
||
|
var timeLow = parseInt(arrayOfParts[0], dojo.uuid.Uuid.HEX_RADIX);
|
||
|
var timeMid = parseInt(arrayOfParts[1], dojo.uuid.Uuid.HEX_RADIX);
|
||
|
var timeHigh = parseInt(arrayOfParts[2], dojo.uuid.Uuid.HEX_RADIX);
|
||
|
var hundredNanosecondIntervalsSince1582 = timeHigh & 0x0FFF;
|
||
|
hundredNanosecondIntervalsSince1582 <<= 16;
|
||
|
hundredNanosecondIntervalsSince1582 += timeMid;
|
||
|
// What we really want to do next is shift left 32 bits, but the
|
||
|
// result will be too big to fit in an int, so we'll multiply by 2^32,
|
||
|
// and the result will be a floating point approximation.
|
||
|
hundredNanosecondIntervalsSince1582 *= 0x100000000;
|
||
|
hundredNanosecondIntervalsSince1582 += timeLow;
|
||
|
var millisecondsSince1582 = hundredNanosecondIntervalsSince1582 / 10000;
|
||
|
|
||
|
// Again, this will be a floating point approximation.
|
||
|
// We can make things exact later if we need to.
|
||
|
var secondsPerHour = 60 * 60;
|
||
|
var hoursBetween1582and1970 = GREGORIAN_CHANGE_OFFSET_IN_HOURS;
|
||
|
var secondsBetween1582and1970 = hoursBetween1582and1970 * secondsPerHour;
|
||
|
var millisecondsBetween1582and1970 = secondsBetween1582and1970 * 1000;
|
||
|
var millisecondsSince1970 = millisecondsSince1582 - millisecondsBetween1582and1970;
|
||
|
|
||
|
this._timestampAsDate = new Date(millisecondsSince1970);
|
||
|
}
|
||
|
return this._timestampAsDate;
|
||
|
break;
|
||
|
default:
|
||
|
// we got passed something other than a valid returnType
|
||
|
dojo.lang.assert(false, "The getTimestamp() method dojo.uuid.Uuid was passed a bogus returnType: " + returnType);
|
||
|
break;
|
||
|
}
|
||
|
};
|