// UID.js
(function() {
	/*global adventurejs A*/ 
  "use strict";

  /**
	 * 
	 * @class adventurejs.UID
   * @ajsnavheading FrameworkReference
   * @ajsinternal
   * @summary Generates sequential unique ID numbers.
   * @classdesc 
	 * <p>
   * Global utility for generating sequential unique ID numbers. 
   * The UID class uses a static interface (ex. 
   * <code class="property">UID.get()</code>)
	 * and should not be instantiated.
   * </p>
   * <p>
   * Shamelessly cribbed from 
   * <a href="https://www.createjs.com/">create.js</a> by 
   * <a href="https://gskinner.com/">gskinner</a>
   * </p>
	 */
  function UID() {
		throw "UID cannot be instantiated";
	}


// private static properties:
	/**
	 * @method adventurejs.UID#_nextID
	 * @memberOf adventurejs.UID
	 * @type Number
	 * @protected
	 **/
	UID._nextID = 0;


// public static methods:
	/**
	 * Returns the next unique id.
	 * @method adventurejs.UID#get
	 * @memberOf adventurejs.UID
	 **/
	UID.get = function UID_get() {
		return "_"+UID._nextID++;
	};

	adventurejs.UID = UID;
}());