package {
	
	
	import flash.events.EventDispatcher;
	import mx.controls.Image;
	
	[Bindable]
	public class ResourceManager extends EventDispatcher {
		
		
		private static var instance:ResourceManager;
		
		
		public function ResourceManager() {
			super();
			if (instance) { throw new Error('Singleton Pattern: Use getInstance() class member'); }
		}
		
		
		public static function getInstance():ResourceManager {
			if (!instance) { instance =new ResourceManager(); }
			return instance;
		}
		
		private var assetManager:Array =new Array();
		
		public function isAssetRegistered(assetId:String):Boolean {
			for each (var o:Object in assetManager) { if (o.assetId == assetId) { return true; } }
			return false;
		}
		
		
		/**
		* keeps a collection of image assets so they do not have to be recreated and poll the server for the same source
		* the only caveat here is that only 1 parent can host the registered asset since it maintains a single reference
		* and adding it as a child anywhere else reparents the object. A better method can be created to create a cloned
		* reference, but I'll leave that up to you.
		*/
		public function getRegisteredAsset(assetId:String):Image {
			for each (var o:Object in assetManager) { if (o.assetId == assetId) { return o.image; } }
			var n:Object ={assetId:assetId, image:new Image()};
			assetManager.push(n);
			return n.image;
		}
		
		public function flushAssets():void {
			for each (var o:Object in assetManager) { o.image =null; }
			assetManager =new Array();
		}
		
		//public function removeRegisteredAsset(assetId:String):void {}
		
	}
}