@awayjs/core/lib/library/IDUtil.ts

AwayJS core classes

export class IDUtil {
	/**
	 *  @private
	 *  Char codes for 0123456789ABCDEF
	 */
	private static ALPHA_CHAR_CODES = [48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70];

	/**
	 *  Generates a UID (unique identifier) based on ActionScript's
	 *  pseudo-random number generator and the current time.
	 *
	 *  <p>The UID has the form
	 *  <code>"XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"</code>
	 *  where X is a hexadecimal digit (0-9, A-F).</p>
	 *
	 *  <p>This UID will not be truly globally unique; but it is the best
	 *  we can do without player support for UID generation.</p>
	 *
	 *  @return The newly-generated UID.
	 *
	 *  @langversion 3.0
	 *  @playerversion Flash 9
	 *  @playerversion AIR 1.1
	 *  @productversion Flex 3
	 */
	public static createUID(): string {
		const uid = new Array(36);
		let index: number = 0;

		let i: number;
		let j: number;

		for (i = 0; i < 8; i++)
			uid[index++] = IDUtil.ALPHA_CHAR_CODES[Math.floor(Math.random() * 16)];

		for (i = 0; i < 3; i++) {
			uid[index++] = 45; // charCode for "-"

			for (j = 0; j < 4; j++)
				uid[index++] = IDUtil.ALPHA_CHAR_CODES[Math.floor(Math.random() * 16)];
		}

		uid[index++] = 45; // charCode for "-"

		const time: number = new Date().getTime();
		// Note: time is the number of milliseconds since 1970,
		// which is currently more than one trillion.
		// We use the low 8 hex digits of this number in the UID.
		// Just in case the system clock has been reset to
		// Jan 1-4, 1970 (in which case this number could have only
		// 1-7 hex digits), we pad on the left with 7 zeros
		// before taking the low digits.
		const timeString: string = ('0000000' + time.toString(16).toUpperCase()).substr(-8);

		for (i = 0; i < 8; i++)
			uid[index++] = timeString.charCodeAt(i);

		for (i = 0; i < 4; i++)
			uid[index++] = IDUtil.ALPHA_CHAR_CODES[Math.floor(Math.random() * 16)];

		return String.fromCharCode.apply(null, uid);
	}

	/**
	 * Returns the decimal representation of a hex digit.
	 * @private

	 private static getDigit(hex:string):number
	 {
		switch (hex) {
			case "A":
			case "a":
				return 10;
			case "B":
			case "b":
				return 11;
			case "C":
			case "c":
				return 12;
			case "D":
			case "d":
				return 13;
			case "E":
			case "e":
				return 14;
			case "F":
			case "f":
				return 15;
			default:
				return new uint(hex);
		}
	}
	 */

}