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The async pipe will convert an observable to the\n * latest value it emitted. It will also request a change detection check when a new value is emitted.\n *\n * ```\n * @Component({\n * selector: \"task-cmp\",\n * changeDetection: ON_PUSH\n * })\n * @View({\n * inline: \"Task Description {{description|async}}\"\n * })\n * class Task {\n * description:Observable<string>;\n * }\n *\n * ```\n *\n * @exportedAs angular2/pipes\n */\nexport class AsyncPipe extends Pipe {\n _ref:ChangeDetectorRef;\n\n _latestValue:Object;\n _latestReturnedValue:Object;\n\n _subscription:Object;\n _observable:Observable;\n\n constructor(ref:ChangeDetectorRef) {\n super();\n this._ref = ref;\n this._latestValue = null;\n this._latestReturnedValue = null;\n this._subscription = null;\n this._observable = null;\n }\n\n supports(obs):boolean {\n return ObservableWrapper.isObservable(obs);\n }\n\n onDestroy():void {\n if (isPresent(this._subscription)) {\n this._dispose();\n };\n }\n\n transform(obs:Observable):any {\n if (isBlank(this._subscription)) {\n this._subscribe(obs);\n return null;\n }\n\n if (obs !== this._observable) {\n this._dispose();\n return this.transform(obs);\n }\n\n if (this._latestValue === this._latestReturnedValue) {\n return NO_CHANGE;\n } else {\n this._latestReturnedValue = this._latestValue;\n return this._latestValue;\n }\n }\n\n _subscribe(obs:Observable):void {\n this._observable = obs;\n this._subscription = ObservableWrapper.subscribe(obs,\n value => this._updateLatestValue(value),\n e => {throw e;}\n );\n }\n\n _dispose():void {\n ObservableWrapper.dispose(this._subscription);\n this._latestValue = null;\n this._latestReturnedValue = null;\n this._subscription = null;\n this._observable = null;\n }\n\n _updateLatestValue(value:Object) {\n this._latestValue = value;\n this._ref.requestCheck();\n }\n}\n\n/**\n * Provides a factory for [AsyncPipe].\n *\n * @exportedAs angular2/pipes\n */\nexport class AsyncPipeFactory {\n supports(obs):boolean {\n return ObservableWrapper.isObservable(obs);\n }\n\n create(cdRef):Pipe {\n return new AsyncPipe(cdRef);\n }\n}"]}