+++ /dev/null
-if(!dojo._hasResource["dojox.uuid.generateTimeBasedUuid"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
-dojo._hasResource["dojox.uuid.generateTimeBasedUuid"] = true;
-dojo.provide("dojox.uuid.generateTimeBasedUuid");
-
-dojox.uuid.generateTimeBasedUuid = function(/*String?*/ node){
- // summary:
- // This function generates time-based UUIDs, meaning "version 1" UUIDs.
- // description:
- // For more info, see
- // http://www.webdav.org/specs/draft-leach-uuids-guids-01.txt
- // http://www.infonuovo.com/dma/csdocs/sketch/instidid.htm
- // http://kruithof.xs4all.nl/uuid/uuidgen
- // http://www.opengroup.org/onlinepubs/009629399/apdxa.htm#tagcjh_20
- // http://jakarta.apache.org/commons/sandbox/id/apidocs/org/apache/commons/id/uuid/clock/Clock.html
- // node:
- // A 12-character hex string representing either a pseudo-node or
- // hardware-node (an IEEE 802.3 network node). A hardware-node
- // will be something like "017bf397618a", always with the first bit
- // being 0. A pseudo-node will be something like "f17bf397618a",
- // always with the first bit being 1.
- // examples:
- // string = dojox.uuid.generateTimeBasedUuid();
- // string = dojox.uuid.generateTimeBasedUuid("017bf397618a");
- // dojox.uuid.generateTimeBasedUuid.setNode("017bf397618a");
- // string = dojox.uuid.generateTimeBasedUuid(); // the generated UUID has node == "017bf397618a"
- var uuidString = dojox.uuid.generateTimeBasedUuid._generator.generateUuidString(node);
- return uuidString; // String
-};
-
-dojox.uuid.generateTimeBasedUuid.isValidNode = function(/*String?*/ node){
- var HEX_RADIX = 16;
- var integer = parseInt(node, HEX_RADIX);
- var valid = dojo.isString(node) && node.length == 12 && isFinite(integer);
- return valid; // Boolean
-};
-
-dojox.uuid.generateTimeBasedUuid.setNode = function(/*String?*/ node){
- // summary:
- // Sets the 'node' value that will be included in generated UUIDs.
- // node: A 12-character hex string representing a pseudoNode or hardwareNode.
- dojox.uuid.assert((node === null) || this.isValidNode(node));
- this._uniformNode = node;
-};
-
-dojox.uuid.generateTimeBasedUuid.getNode = function(){
- // summary:
- // Returns the 'node' value that will be included in generated UUIDs.
- return this._uniformNode; // String (a 12-character hex string representing a pseudoNode or hardwareNode)
-};
-
-
-dojox.uuid.generateTimeBasedUuid._generator = new function(){
- // 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:
- // dojox.uuid.generateTimeBasedUuid.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;
-
- // --------------------------------------------------
- // 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;
- dojox.uuid.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];
- x /= 0x10000;
- result[2] = x % 0x10000;
- x -= result[2];
- x /= 0x10000;
- result[1] = x % 0x10000;
- x -= result[1];
- x /= 0x10000;
- result[0] = x;
- return result; // Array with 4 elements, each of which is a 16-bit number.
- }
-
- function _addTwo64bitArrays(/* array */ arrayA, /* array */ arrayB){
- // summary:
- // Takes two arrays, each of which holds a 64-bit number broken into 4
- // 16-bit elements, and returns a new array that holds a 64-bit number
- // that is the sum of the two original numbers.
- // arrayA: An array with 4 elements, each of which is a 16-bit number.
- // arrayB: An array with 4 elements, each of which is a 16-bit number.
- dojox.uuid.assert(dojo.isArray(arrayA));
- dojox.uuid.assert(dojo.isArray(arrayB));
- dojox.uuid.assert(arrayA.length == 4);
- dojox.uuid.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; // Array with 4 elements, each of which is a 16-bit number.
- }
-
- function _multiplyTwo64bitArrays(/* array */ arrayA, /* array */ arrayB){
- // summary:
- // Takes two arrays, each of which holds a 64-bit number broken into 4
- // 16-bit elements, and returns a new array that holds a 64-bit number
- // that is the product of the two original numbers.
- // arrayA: An array with 4 elements, each of which is a 16-bit number.
- // arrayB: An array with 4 elements, each of which is a 16-bit number.
- dojox.uuid.assert(dojo.isArray(arrayA));
- dojox.uuid.assert(dojo.isArray(arrayB));
- dojox.uuid.assert(arrayA.length == 4);
- dojox.uuid.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; }
- dojox.uuid.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; // Array with 4 elements, each of which is a 16-bit number.
- }
-
- function _padWithLeadingZeros(/* string */ string, /* int */ desiredLength){
- // summary:
- // Pads a string with leading zeros and returns the result.
- // string: A string to add padding to.
- // desiredLength: The number of characters the return string should have.
-
- // examples:
- // result = _padWithLeadingZeros("abc", 6);
- // dojox.uuid.assert(result == "000abc");
- while(string.length < desiredLength){
- string = "0" + string;
- }
- return string; // string
- }
-
- function _generateRandomEightCharacterHexString() {
- // summary:
- // Returns a randomly generated 8-character string of hex digits.
-
- // FIXME: This probably isn't a very high quality random number.
-
- // Make random32bitNumber be a randomly generated floating point number
- // between 0 and (4,294,967,296 - 1), inclusive.
- 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; // String (an 8-character hex string)
- }
-
- this.generateUuidString = function(/*String?*/ node){
- // summary:
- // Generates a time-based UUID, meaning a version 1 UUID.
- // description:
- // JavaScript code running in a browser doesn't have access to the
- // IEEE 802.3 address of the computer, so if a node value isn't
- // supplied, we generate a random pseudonode value instead.
- // node: An optional 12-character string to use as the node in the new UUID.
- if(node){
- dojox.uuid.assert(dojox.uuid.generateTimeBasedUuid.isValidNode(node));
- }else{
- if(dojox.uuid.generateTimeBasedUuid._uniformNode){
- node = dojox.uuid.generateTimeBasedUuid._uniformNode;
- }else{
- if(!_uuidPseudoNodeString){
- var pseudoNodeIndicatorBit = 0x8000;
- 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 = 0x8000; // 10--------------, i.e. uses only first two of 16 bits.
- var random14bitNumber = Math.floor( (Math.random() % 1) * Math.pow(2, 14) );
- _uuidClockSeqString = (variantCodeForDCEUuids | random14bitNumber).toString(HEX_RADIX);
- }
-
- // Maybe we should think about trying to make the code more readable to
- // newcomers by creating a class called "WholeNumber" that encapsulates
- // the methods and data structures for working with these arrays that
- // hold 4 16-bit numbers? And then these variables below have names
- // like "wholeSecondsPerHour" rather than "arraySecondsPerHour"?
- var now = new Date();
- var millisecondsSince1970 = now.valueOf(); // milliseconds since midnight 01 January, 1970 UTC.
- var nowArray = _get64bitArrayFromFloat(millisecondsSince1970);
- if(!_cachedMillisecondsBetween1582and1970){
- var arraySecondsPerHour = _get64bitArrayFromFloat(60 * 60);
- var arrayHoursBetween1582and1970 = _get64bitArrayFromFloat(dojox.uuid.generateTimeBasedUuid._generator.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) {
- // If we've gotten to here, it means we've already generated 10,000
- // UUIDs in this single millisecond, which is the most that the UUID
- // timestamp field allows for. So now we'll just sit here and wait
- // for a fraction of a millisecond, so as to ensure that the next
- // time this method is called there will be a different millisecond
- // value in the timestamp field.
- 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"; // binary2hex("0001")
- var resultUuid = hexTimeLow + hyphen + hexTimeMid + hyphen +
- versionCodeForTimeBasedUuids + hexTimeHigh + hyphen +
- _uuidClockSeqString + hyphen + node;
- resultUuid = resultUuid.toLowerCase();
- return resultUuid; // String (a 36 character string, which will look something like "b4308fb0-86cd-11da-a72b-0800200c9a66")
- }
-
-}();
-
-}
projects / eow / blobdiff