flymis/WebRoot/dojojs/src/uuid/TimeBasedGenerator.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.uuid.TimeBasedGenerator");
dojo.require("dojo.lang.common");
dojo.require("dojo.lang.type");
dojo.require("dojo.lang.assert");

dojo.uuid.TimeBasedGenerator = new function() {

	// --------------------------------------------------
	// Public constants:
	// Number of hours between October 15, 1582 and January 1, 1970:
	this.GREGORIAN_CHANGE_OFFSET_IN_HOURS = 3394248;
	// Number of seconds between October 15, 1582 and January 1, 1970:
	//   this.GREGORIAN_CHANGE_OFFSET_IN_SECONDS = 12219292800;	
	
	// --------------------------------------------------
	// Private variables:
	var _uuidPseudoNodeString = null;
	var _uuidClockSeqString = null;
	var _dateValueOfPreviousUuid = null;
	var _nextIntraMillisecondIncrement = 0;
	var _cachedMillisecondsBetween1582and1970 = null;
	var _cachedHundredNanosecondIntervalsPerMillisecond = null;
	var _uniformNode = null;
	
	// --------------------------------------------------
	// Private constants:
	var HEX_RADIX = 16;

	function _carry(/* array */ arrayA) {
		// summary: 
		//   Given an array which holds a 64-bit number broken into 4 16-bit 
		//   elements, this method carries any excess bits (greater than 16-bits) 
		//   from each array element into the next.
		// arrayA: An array with 4 elements, each of which is a 16-bit number.
		arrayA[2] += arrayA[3] >>> 16;
		arrayA[3] &= 0xFFFF;
		arrayA[1] += arrayA[2] >>> 16;
		arrayA[2] &= 0xFFFF;
		arrayA[0] += arrayA[1] >>> 16;
		arrayA[1] &= 0xFFFF;
		dojo.lang.assert((arrayA[0] >>> 16) === 0);
	}

	function _get64bitArrayFromFloat(/* float */ x) {
		// summary: 
		//   Given a floating point number, this method returns an array which 
		//   holds a 64-bit number broken into 4 16-bit elements.
		var result = new Array(0, 0, 0, 0);
		result[3] = x % 0x10000;
		x -= result[3];