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Struts example source code file (TimeBasedGenerator.js)
The Struts TimeBasedGenerator.js source code/* 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; }; }(); Other Struts examples (source code examples)Here is a short list of links related to this Struts TimeBasedGenerator.js source code file: |
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