| /* |
| 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 () { |
| this.GREGORIAN_CHANGE_OFFSET_IN_HOURS = 3394248; |
| var _uuidPseudoNodeString = null; |
| var _uuidClockSeqString = null; |
| var _dateValueOfPreviousUuid = null; |
| var _nextIntraMillisecondIncrement = 0; |
| var _cachedMillisecondsBetween1582and1970 = null; |
| var _cachedHundredNanosecondIntervalsPerMillisecond = null; |
| var _uniformNode = null; |
| var HEX_RADIX = 16; |
| function _carry(arrayA) { |
| arrayA[2] += arrayA[3] >>> 16; |
| arrayA[3] &= 65535; |
| arrayA[1] += arrayA[2] >>> 16; |
| arrayA[2] &= 65535; |
| arrayA[0] += arrayA[1] >>> 16; |
| arrayA[1] &= 65535; |
| dojo.lang.assert((arrayA[0] >>> 16) === 0); |
| } |
| function _get64bitArrayFromFloat(x) { |
| var result = new Array(0, 0, 0, 0); |
| result[3] = x % 65536; |
| x -= result[3]; |
| x /= 65536; |
| result[2] = x % 65536; |
| x -= result[2]; |
| x /= 65536; |
| result[1] = x % 65536; |
| x -= result[1]; |
| x /= 65536; |
| result[0] = x; |
| return result; |
| } |
| function _addTwo64bitArrays(arrayA, arrayB) { |
| dojo.lang.assertType(arrayA, Array); |
| dojo.lang.assertType(arrayB, Array); |
| dojo.lang.assert(arrayA.length == 4); |
| dojo.lang.assert(arrayB.length == 4); |
| var result = new Array(0, 0, 0, 0); |
| result[3] = arrayA[3] + arrayB[3]; |
| result[2] = arrayA[2] + arrayB[2]; |
| result[1] = arrayA[1] + arrayB[1]; |
| result[0] = arrayA[0] + arrayB[0]; |
| _carry(result); |
| return result; |
| } |
| function _multiplyTwo64bitArrays(arrayA, arrayB) { |
| dojo.lang.assertType(arrayA, Array); |
| dojo.lang.assertType(arrayB, Array); |
| dojo.lang.assert(arrayA.length == 4); |
| dojo.lang.assert(arrayB.length == 4); |
| var overflow = false; |
| if (arrayA[0] * arrayB[0] !== 0) { |
| overflow = true; |
| } |
| if (arrayA[0] * arrayB[1] !== 0) { |
| overflow = true; |
| } |
| if (arrayA[0] * arrayB[2] !== 0) { |
| overflow = true; |
| } |
| if (arrayA[1] * arrayB[0] !== 0) { |
| overflow = true; |
| } |
| if (arrayA[1] * arrayB[1] !== 0) { |
| overflow = true; |
| } |
| if (arrayA[2] * arrayB[0] !== 0) { |
| overflow = true; |
| } |
| dojo.lang.assert(!overflow); |
| var result = new Array(0, 0, 0, 0); |
| result[0] += arrayA[0] * arrayB[3]; |
| _carry(result); |
| result[0] += arrayA[1] * arrayB[2]; |
| _carry(result); |
| result[0] += arrayA[2] * arrayB[1]; |
| _carry(result); |
| result[0] += arrayA[3] * arrayB[0]; |
| _carry(result); |
| result[1] += arrayA[1] * arrayB[3]; |
| _carry(result); |
| result[1] += arrayA[2] * arrayB[2]; |
| _carry(result); |
| result[1] += arrayA[3] * arrayB[1]; |
| _carry(result); |
| result[2] += arrayA[2] * arrayB[3]; |
| _carry(result); |
| result[2] += arrayA[3] * arrayB[2]; |
| _carry(result); |
| result[3] += arrayA[3] * arrayB[3]; |
| _carry(result); |
| return result; |
| } |
| function _padWithLeadingZeros(string, desiredLength) { |
| while (string.length < desiredLength) { |
| string = "0" + string; |
| } |
| return string; |
| } |
| function _generateRandomEightCharacterHexString() { |
| var random32bitNumber = Math.floor((Math.random() % 1) * Math.pow(2, 32)); |
| var eightCharacterString = random32bitNumber.toString(HEX_RADIX); |
| while (eightCharacterString.length < 8) { |
| eightCharacterString = "0" + eightCharacterString; |
| } |
| return eightCharacterString; |
| } |
| function _generateUuidString(node) { |
| dojo.lang.assertType(node, String, {optional:true}); |
| if (node) { |
| dojo.lang.assert(node.length == 12); |
| } else { |
| if (_uniformNode) { |
| node = _uniformNode; |
| } else { |
| if (!_uuidPseudoNodeString) { |
| var pseudoNodeIndicatorBit = 32768; |
| var random15bitNumber = Math.floor((Math.random() % 1) * Math.pow(2, 15)); |
| var leftmost4HexCharacters = (pseudoNodeIndicatorBit | random15bitNumber).toString(HEX_RADIX); |
| _uuidPseudoNodeString = leftmost4HexCharacters + _generateRandomEightCharacterHexString(); |
| } |
| node = _uuidPseudoNodeString; |
| } |
| } |
| if (!_uuidClockSeqString) { |
| var variantCodeForDCEUuids = 32768; |
| var random14bitNumber = Math.floor((Math.random() % 1) * Math.pow(2, 14)); |
| _uuidClockSeqString = (variantCodeForDCEUuids | random14bitNumber).toString(HEX_RADIX); |
| } |
| var now = new Date(); |
| var millisecondsSince1970 = now.valueOf(); |
| var nowArray = _get64bitArrayFromFloat(millisecondsSince1970); |
| if (!_cachedMillisecondsBetween1582and1970) { |
| var arraySecondsPerHour = _get64bitArrayFromFloat(60 * 60); |
| var arrayHoursBetween1582and1970 = _get64bitArrayFromFloat(dojo.uuid.TimeBasedGenerator.GREGORIAN_CHANGE_OFFSET_IN_HOURS); |
| var arraySecondsBetween1582and1970 = _multiplyTwo64bitArrays(arrayHoursBetween1582and1970, arraySecondsPerHour); |
| var arrayMillisecondsPerSecond = _get64bitArrayFromFloat(1000); |
| _cachedMillisecondsBetween1582and1970 = _multiplyTwo64bitArrays(arraySecondsBetween1582and1970, arrayMillisecondsPerSecond); |
| _cachedHundredNanosecondIntervalsPerMillisecond = _get64bitArrayFromFloat(10000); |
| } |
| var arrayMillisecondsSince1970 = nowArray; |
| var arrayMillisecondsSince1582 = _addTwo64bitArrays(_cachedMillisecondsBetween1582and1970, arrayMillisecondsSince1970); |
| var arrayHundredNanosecondIntervalsSince1582 = _multiplyTwo64bitArrays(arrayMillisecondsSince1582, _cachedHundredNanosecondIntervalsPerMillisecond); |
| if (now.valueOf() == _dateValueOfPreviousUuid) { |
| arrayHundredNanosecondIntervalsSince1582[3] += _nextIntraMillisecondIncrement; |
| _carry(arrayHundredNanosecondIntervalsSince1582); |
| _nextIntraMillisecondIncrement += 1; |
| if (_nextIntraMillisecondIncrement == 10000) { |
| while (now.valueOf() == _dateValueOfPreviousUuid) { |
| now = new Date(); |
| } |
| } |
| } else { |
| _dateValueOfPreviousUuid = now.valueOf(); |
| _nextIntraMillisecondIncrement = 1; |
| } |
| var hexTimeLowLeftHalf = arrayHundredNanosecondIntervalsSince1582[2].toString(HEX_RADIX); |
| var hexTimeLowRightHalf = arrayHundredNanosecondIntervalsSince1582[3].toString(HEX_RADIX); |
| var hexTimeLow = _padWithLeadingZeros(hexTimeLowLeftHalf, 4) + _padWithLeadingZeros(hexTimeLowRightHalf, 4); |
| var hexTimeMid = arrayHundredNanosecondIntervalsSince1582[1].toString(HEX_RADIX); |
| hexTimeMid = _padWithLeadingZeros(hexTimeMid, 4); |
| var hexTimeHigh = arrayHundredNanosecondIntervalsSince1582[0].toString(HEX_RADIX); |
| hexTimeHigh = _padWithLeadingZeros(hexTimeHigh, 3); |
| var hyphen = "-"; |
| var versionCodeForTimeBasedUuids = "1"; |
| var resultUuid = hexTimeLow + hyphen + hexTimeMid + hyphen + versionCodeForTimeBasedUuids + hexTimeHigh + hyphen + _uuidClockSeqString + hyphen + node; |
| resultUuid = resultUuid.toLowerCase(); |
| return resultUuid; |
| } |
| this.setNode = function (node) { |
| dojo.lang.assert((node === null) || (node.length == 12)); |
| _uniformNode = node; |
| }; |
| this.getNode = function () { |
| return _uniformNode; |
| }; |
| this.generate = function (input) { |
| var nodeString = null; |
| var returnType = null; |
| if (input) { |
| if (dojo.lang.isObject(input) && !dojo.lang.isBuiltIn(input)) { |
| var namedParameters = input; |
| dojo.lang.assertValidKeywords(namedParameters, ["node", "hardwareNode", "pseudoNode", "returnType"]); |
| var node = namedParameters["node"]; |
| var hardwareNode = namedParameters["hardwareNode"]; |
| var pseudoNode = namedParameters["pseudoNode"]; |
| nodeString = (node || pseudoNode || hardwareNode); |
| if (nodeString) { |
| var firstCharacter = nodeString.charAt(0); |
| var firstDigit = parseInt(firstCharacter, HEX_RADIX); |
| if (hardwareNode) { |
| dojo.lang.assert((firstDigit >= 0) && (firstDigit <= 7)); |
| } |
| if (pseudoNode) { |
| dojo.lang.assert((firstDigit >= 8) && (firstDigit <= 15)); |
| } |
| } |
| returnType = namedParameters["returnType"]; |
| dojo.lang.assertType(returnType, Function, {optional:true}); |
| } else { |
| if (dojo.lang.isString(input)) { |
| nodeString = input; |
| returnType = null; |
| } else { |
| if (dojo.lang.isFunction(input)) { |
| nodeString = null; |
| returnType = input; |
| } |
| } |
| } |
| if (nodeString) { |
| dojo.lang.assert(nodeString.length == 12); |
| var integer = parseInt(nodeString, HEX_RADIX); |
| dojo.lang.assert(isFinite(integer)); |
| } |
| dojo.lang.assertType(returnType, Function, {optional:true}); |
| } |
| var uuidString = _generateUuidString(nodeString); |
| var returnValue; |
| if (returnType && (returnType != String)) { |
| returnValue = new returnType(uuidString); |
| } else { |
| returnValue = uuidString; |
| } |
| return returnValue; |
| }; |
| }(); |
| |