angular2/src/change_detection/pipes/async_pipe.map

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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}"]}