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AS3 | KCSingleton

/ Published in: ActionScript 3
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  1. package kc.core {
  2. 	import flash.errors.IllegalOperationError;
  3. 	import flash.utils.Dictionary;
  4.  
  5. 	public class KCSingleton extends Object {
  6.  
  7. 		// @const
  8.  
  9. 		public static const ERROR:String = "Illegal instantiation attempted on class of singleton type.";
  10.  
  11. 		// @private
  12.  
  13. 		private static var _records:Dictionary;
  14.  
  15. 		// @constructor
  16.  
  17. 		public function KCSingleton() {
  18. 			throw new IllegalOperationError( ERROR );
  19. 		}
  20.  
  21. 		// @methods
  22.  
  23. 		public static function register( api:String, value:Class ):void {
  24. 			if( _records == null ) {
  25. 				_records = new Dictionary(true);
  26. 			} if( ! KCSingleton.getClass( api ) ) {
  27. 				_records[api] = value;
  28. 			}		
  29. 		}
  30.  
  31. 		public static function getClass( api:String ):Class {
  32. 			if( _records == null ){
  33. 				throw new IllegalOperationError("No records.");
  34. 			} return _records[api];
  35. 		}
  36.  
  37. 		public static function getInstance( api:String ):* {
  38. 			var instance:Class = KCSingleton.getClass(api);
  39. 			if( ! instance ){
  40. 				throw new Error("No class registered for interface \""+api+"\".");	
  41. 			} return instance["getInstance"]();
  42. 		}
  43.  
  44. 		public static function purge(...rest):void {
  45. 			_records = null;
  46. 		}
  47.  
  48. 	}
  49.  
  50. }

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