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287 lines
12 KiB
JavaScript
287 lines
12 KiB
JavaScript
dojo.provide("dojox.uuid.generateTimeBasedUuid");
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dojox.uuid.generateTimeBasedUuid = function(/*String?*/ node){
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// summary:
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// This function generates time-based UUIDs, meaning "version 1" UUIDs.
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// description:
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// For more info, see
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// http://www.webdav.org/specs/draft-leach-uuids-guids-01.txt
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// http://www.infonuovo.com/dma/csdocs/sketch/instidid.htm
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// http://kruithof.xs4all.nl/uuid/uuidgen
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// http://www.opengroup.org/onlinepubs/009629399/apdxa.htm#tagcjh_20
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// http://jakarta.apache.org/commons/sandbox/id/apidocs/org/apache/commons/id/uuid/clock/Clock.html
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// node:
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// A 12-character hex string representing either a pseudo-node or
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// hardware-node (an IEEE 802.3 network node). A hardware-node
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// will be something like "017bf397618a", always with the first bit
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// being 0. A pseudo-node will be something like "f17bf397618a",
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// always with the first bit being 1.
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// examples:
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// string = dojox.uuid.generateTimeBasedUuid();
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// string = dojox.uuid.generateTimeBasedUuid("017bf397618a");
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// dojox.uuid.generateTimeBasedUuid.setNode("017bf397618a");
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// string = dojox.uuid.generateTimeBasedUuid(); // the generated UUID has node == "017bf397618a"
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var uuidString = dojox.uuid.generateTimeBasedUuid._generator.generateUuidString(node);
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return uuidString; // String
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};
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dojox.uuid.generateTimeBasedUuid.isValidNode = function(/*String?*/ node){
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var HEX_RADIX = 16;
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var integer = parseInt(node, HEX_RADIX);
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var valid = dojo.isString(node) && node.length == 12 && isFinite(integer);
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return valid; // Boolean
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};
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dojox.uuid.generateTimeBasedUuid.setNode = function(/*String?*/ node){
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// summary:
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// Sets the 'node' value that will be included in generated UUIDs.
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// node: A 12-character hex string representing a pseudoNode or hardwareNode.
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dojox.uuid.assert((node === null) || this.isValidNode(node));
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this._uniformNode = node;
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};
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dojox.uuid.generateTimeBasedUuid.getNode = function(){
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// summary:
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// Returns the 'node' value that will be included in generated UUIDs.
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return this._uniformNode; // String (a 12-character hex string representing a pseudoNode or hardwareNode)
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};
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dojox.uuid.generateTimeBasedUuid._generator = new function(){
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// Number of hours between October 15, 1582 and January 1, 1970:
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this.GREGORIAN_CHANGE_OFFSET_IN_HOURS = 3394248;
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// Number of seconds between October 15, 1582 and January 1, 1970:
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// dojox.uuid.generateTimeBasedUuid.GREGORIAN_CHANGE_OFFSET_IN_SECONDS = 12219292800;
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// --------------------------------------------------
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// Private variables:
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var _uuidPseudoNodeString = null;
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var _uuidClockSeqString = null;
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var _dateValueOfPreviousUuid = null;
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var _nextIntraMillisecondIncrement = 0;
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var _cachedMillisecondsBetween1582and1970 = null;
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var _cachedHundredNanosecondIntervalsPerMillisecond = null;
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// --------------------------------------------------
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// Private constants:
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var HEX_RADIX = 16;
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function _carry(/* array */ arrayA){
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// summary:
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// Given an array which holds a 64-bit number broken into 4 16-bit
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// elements, this method carries any excess bits (greater than 16-bits)
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// from each array element into the next.
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// arrayA: An array with 4 elements, each of which is a 16-bit number.
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arrayA[2] += arrayA[3] >>> 16;
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arrayA[3] &= 0xFFFF;
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arrayA[1] += arrayA[2] >>> 16;
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arrayA[2] &= 0xFFFF;
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arrayA[0] += arrayA[1] >>> 16;
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arrayA[1] &= 0xFFFF;
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dojox.uuid.assert((arrayA[0] >>> 16) === 0);
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}
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function _get64bitArrayFromFloat(/* float */ x){
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// summary:
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// Given a floating point number, this method returns an array which
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// holds a 64-bit number broken into 4 16-bit elements.
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var result = new Array(0, 0, 0, 0);
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result[3] = x % 0x10000;
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x -= result[3];
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x /= 0x10000;
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result[2] = x % 0x10000;
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x -= result[2];
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x /= 0x10000;
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result[1] = x % 0x10000;
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x -= result[1];
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x /= 0x10000;
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result[0] = x;
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return result; // Array with 4 elements, each of which is a 16-bit number.
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}
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function _addTwo64bitArrays(/* array */ arrayA, /* array */ arrayB){
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// summary:
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// Takes two arrays, each of which holds a 64-bit number broken into 4
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// 16-bit elements, and returns a new array that holds a 64-bit number
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// that is the sum of the two original numbers.
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// arrayA: An array with 4 elements, each of which is a 16-bit number.
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// arrayB: An array with 4 elements, each of which is a 16-bit number.
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dojox.uuid.assert(dojo.isArray(arrayA));
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dojox.uuid.assert(dojo.isArray(arrayB));
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dojox.uuid.assert(arrayA.length == 4);
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dojox.uuid.assert(arrayB.length == 4);
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var result = new Array(0, 0, 0, 0);
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result[3] = arrayA[3] + arrayB[3];
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result[2] = arrayA[2] + arrayB[2];
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result[1] = arrayA[1] + arrayB[1];
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result[0] = arrayA[0] + arrayB[0];
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_carry(result);
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return result; // Array with 4 elements, each of which is a 16-bit number.
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}
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function _multiplyTwo64bitArrays(/* array */ arrayA, /* array */ arrayB){
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// summary:
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// Takes two arrays, each of which holds a 64-bit number broken into 4
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// 16-bit elements, and returns a new array that holds a 64-bit number
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// that is the product of the two original numbers.
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// arrayA: An array with 4 elements, each of which is a 16-bit number.
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// arrayB: An array with 4 elements, each of which is a 16-bit number.
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dojox.uuid.assert(dojo.isArray(arrayA));
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dojox.uuid.assert(dojo.isArray(arrayB));
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dojox.uuid.assert(arrayA.length == 4);
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dojox.uuid.assert(arrayB.length == 4);
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var overflow = false;
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if(arrayA[0] * arrayB[0] !== 0){ overflow = true; }
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if(arrayA[0] * arrayB[1] !== 0){ overflow = true; }
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if(arrayA[0] * arrayB[2] !== 0){ overflow = true; }
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if(arrayA[1] * arrayB[0] !== 0){ overflow = true; }
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if(arrayA[1] * arrayB[1] !== 0){ overflow = true; }
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if(arrayA[2] * arrayB[0] !== 0){ overflow = true; }
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dojox.uuid.assert(!overflow);
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var result = new Array(0, 0, 0, 0);
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result[0] += arrayA[0] * arrayB[3];
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_carry(result);
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result[0] += arrayA[1] * arrayB[2];
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_carry(result);
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result[0] += arrayA[2] * arrayB[1];
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_carry(result);
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result[0] += arrayA[3] * arrayB[0];
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_carry(result);
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result[1] += arrayA[1] * arrayB[3];
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_carry(result);
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result[1] += arrayA[2] * arrayB[2];
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_carry(result);
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result[1] += arrayA[3] * arrayB[1];
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_carry(result);
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result[2] += arrayA[2] * arrayB[3];
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_carry(result);
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result[2] += arrayA[3] * arrayB[2];
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_carry(result);
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result[3] += arrayA[3] * arrayB[3];
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_carry(result);
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return result; // Array with 4 elements, each of which is a 16-bit number.
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}
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function _padWithLeadingZeros(/* string */ string, /* int */ desiredLength){
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// summary:
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// Pads a string with leading zeros and returns the result.
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// string: A string to add padding to.
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// desiredLength: The number of characters the return string should have.
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// examples:
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// result = _padWithLeadingZeros("abc", 6);
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// dojox.uuid.assert(result == "000abc");
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while(string.length < desiredLength){
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string = "0" + string;
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}
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return string; // string
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}
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function _generateRandomEightCharacterHexString() {
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// summary:
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// Returns a randomly generated 8-character string of hex digits.
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// FIXME: This probably isn't a very high quality random number.
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// Make random32bitNumber be a randomly generated floating point number
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// between 0 and (4,294,967,296 - 1), inclusive.
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var random32bitNumber = Math.floor( (Math.random() % 1) * Math.pow(2, 32) );
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var eightCharacterString = random32bitNumber.toString(HEX_RADIX);
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while(eightCharacterString.length < 8){
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eightCharacterString = "0" + eightCharacterString;
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}
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return eightCharacterString; // String (an 8-character hex string)
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}
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this.generateUuidString = function(/*String?*/ node){
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// summary:
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// Generates a time-based UUID, meaning a version 1 UUID.
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// description:
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// JavaScript code running in a browser doesn't have access to the
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// IEEE 802.3 address of the computer, so if a node value isn't
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// supplied, we generate a random pseudonode value instead.
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// node: An optional 12-character string to use as the node in the new UUID.
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if(node){
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dojox.uuid.assert(dojox.uuid.generateTimeBasedUuid.isValidNode(node));
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}else{
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if(dojox.uuid.generateTimeBasedUuid._uniformNode){
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node = dojox.uuid.generateTimeBasedUuid._uniformNode;
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}else{
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if(!_uuidPseudoNodeString){
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var pseudoNodeIndicatorBit = 0x8000;
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var random15bitNumber = Math.floor( (Math.random() % 1) * Math.pow(2, 15) );
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var leftmost4HexCharacters = (pseudoNodeIndicatorBit | random15bitNumber).toString(HEX_RADIX);
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_uuidPseudoNodeString = leftmost4HexCharacters + _generateRandomEightCharacterHexString();
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}
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node = _uuidPseudoNodeString;
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}
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}
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if(!_uuidClockSeqString){
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var variantCodeForDCEUuids = 0x8000; // 10--------------, i.e. uses only first two of 16 bits.
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var random14bitNumber = Math.floor( (Math.random() % 1) * Math.pow(2, 14) );
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_uuidClockSeqString = (variantCodeForDCEUuids | random14bitNumber).toString(HEX_RADIX);
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}
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// Maybe we should think about trying to make the code more readable to
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// newcomers by creating a class called "WholeNumber" that encapsulates
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// the methods and data structures for working with these arrays that
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// hold 4 16-bit numbers? And then these variables below have names
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// like "wholeSecondsPerHour" rather than "arraySecondsPerHour"?
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var now = new Date();
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var millisecondsSince1970 = now.valueOf(); // milliseconds since midnight 01 January, 1970 UTC.
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var nowArray = _get64bitArrayFromFloat(millisecondsSince1970);
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if(!_cachedMillisecondsBetween1582and1970){
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var arraySecondsPerHour = _get64bitArrayFromFloat(60 * 60);
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var arrayHoursBetween1582and1970 = _get64bitArrayFromFloat(dojox.uuid.generateTimeBasedUuid._generator.GREGORIAN_CHANGE_OFFSET_IN_HOURS);
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var arraySecondsBetween1582and1970 = _multiplyTwo64bitArrays(arrayHoursBetween1582and1970, arraySecondsPerHour);
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var arrayMillisecondsPerSecond = _get64bitArrayFromFloat(1000);
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_cachedMillisecondsBetween1582and1970 = _multiplyTwo64bitArrays(arraySecondsBetween1582and1970, arrayMillisecondsPerSecond);
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_cachedHundredNanosecondIntervalsPerMillisecond = _get64bitArrayFromFloat(10000);
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}
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var arrayMillisecondsSince1970 = nowArray;
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var arrayMillisecondsSince1582 = _addTwo64bitArrays(_cachedMillisecondsBetween1582and1970, arrayMillisecondsSince1970);
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var arrayHundredNanosecondIntervalsSince1582 = _multiplyTwo64bitArrays(arrayMillisecondsSince1582, _cachedHundredNanosecondIntervalsPerMillisecond);
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if(now.valueOf() == _dateValueOfPreviousUuid){
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arrayHundredNanosecondIntervalsSince1582[3] += _nextIntraMillisecondIncrement;
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_carry(arrayHundredNanosecondIntervalsSince1582);
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_nextIntraMillisecondIncrement += 1;
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if (_nextIntraMillisecondIncrement == 10000) {
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// If we've gotten to here, it means we've already generated 10,000
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// UUIDs in this single millisecond, which is the most that the UUID
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// timestamp field allows for. So now we'll just sit here and wait
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// for a fraction of a millisecond, so as to ensure that the next
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// time this method is called there will be a different millisecond
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// value in the timestamp field.
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while (now.valueOf() == _dateValueOfPreviousUuid) {
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now = new Date();
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}
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}
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}else{
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_dateValueOfPreviousUuid = now.valueOf();
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_nextIntraMillisecondIncrement = 1;
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}
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var hexTimeLowLeftHalf = arrayHundredNanosecondIntervalsSince1582[2].toString(HEX_RADIX);
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var hexTimeLowRightHalf = arrayHundredNanosecondIntervalsSince1582[3].toString(HEX_RADIX);
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var hexTimeLow = _padWithLeadingZeros(hexTimeLowLeftHalf, 4) + _padWithLeadingZeros(hexTimeLowRightHalf, 4);
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var hexTimeMid = arrayHundredNanosecondIntervalsSince1582[1].toString(HEX_RADIX);
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hexTimeMid = _padWithLeadingZeros(hexTimeMid, 4);
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var hexTimeHigh = arrayHundredNanosecondIntervalsSince1582[0].toString(HEX_RADIX);
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hexTimeHigh = _padWithLeadingZeros(hexTimeHigh, 3);
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var hyphen = "-";
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var versionCodeForTimeBasedUuids = "1"; // binary2hex("0001")
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var resultUuid = hexTimeLow + hyphen + hexTimeMid + hyphen +
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versionCodeForTimeBasedUuids + hexTimeHigh + hyphen +
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_uuidClockSeqString + hyphen + node;
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resultUuid = resultUuid.toLowerCase();
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return resultUuid; // String (a 36 character string, which will look something like "b4308fb0-86cd-11da-a72b-0800200c9a66")
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}
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}();
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