opennms/src/internal/UUID.ts

Client API for the OpenNMS network monitoring platform

// http://stackoverflow.com/a/8809472

/* eslint-disable no-bitwise */

/**
 * A utility class for generating UUIDs.
 * @category Internal
 */
export class UUID {
  /**
   * Generates a UUID.  Attempts to use the high-precision timer if possible.
   */
  public static generate() {
    let d = new Date().getTime();
    if (typeof performance !== 'undefined' && typeof performance.now === 'function') {
      d += performance.now(); // use high-precision timer if available
    }
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
      const r = (d + Math.random() * 16) % 16 | 0;
      d = Math.floor(d / 16);
      return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
    });
  }
}