/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { ChangeDetectorRef, Pipe, ɵisPromise, ɵisSubscribable } from '@angular/core';
import { invalidPipeArgumentError } from './invalid_pipe_argument_error';
class SubscribableStrategy {
    createSubscription(async, updateLatestValue) {
        return async.subscribe({
            next: updateLatestValue,
            error: (e) => {
                throw e;
            }
        });
    }
    dispose(subscription) {
        subscription.unsubscribe();
    }
    onDestroy(subscription) {
        subscription.unsubscribe();
    }
}
class PromiseStrategy {
    createSubscription(async, updateLatestValue) {
        return async.then(updateLatestValue, e => {
            throw e;
        });
    }
    dispose(subscription) { }
    onDestroy(subscription) { }
}
const _promiseStrategy = new PromiseStrategy();
const _subscribableStrategy = new SubscribableStrategy();
/**
 * @ngModule CommonModule
 * @description
 *
 * Unwraps a value from an asynchronous primitive.
 *
 * The `async` pipe subscribes to an `Observable` or `Promise` and returns the latest value it has
 * emitted. When a new value is emitted, the `async` pipe marks the component to be checked for
 * changes. When the component gets destroyed, the `async` pipe unsubscribes automatically to avoid
 * potential memory leaks. When the reference of the expression changes, the `async` pipe
 * automatically unsubscribes from the old `Observable` or `Promise` and subscribes to the new one.
 *
 * @usageNotes
 *
 * ### Examples
 *
 * This example binds a `Promise` to the view. Clicking the `Resolve` button resolves the
 * promise.
 *
 * {@example common/pipes/ts/async_pipe.ts region='AsyncPipePromise'}
 *
 * It's also possible to use `async` with Observables. The example below binds the `time` Observable
 * to the view. The Observable continuously updates the view with the current time.
 *
 * {@example common/pipes/ts/async_pipe.ts region='AsyncPipeObservable'}
 *
 * @publicApi
 */
export class AsyncPipe {
    constructor(_ref) {
        this._ref = _ref;
        this._latestValue = null;
        this._subscription = null;
        this._obj = null;
        this._strategy = null;
    }
    ngOnDestroy() {
        if (this._subscription) {
            this._dispose();
        }
    }
    transform(obj) {
        if (!this._obj) {
            if (obj) {
                this._subscribe(obj);
            }
            return this._latestValue;
        }
        if (obj !== this._obj) {
            this._dispose();
            return this.transform(obj);
        }
        return this._latestValue;
    }
    _subscribe(obj) {
        this._obj = obj;
        this._strategy = this._selectStrategy(obj);
        this._subscription = this._strategy.createSubscription(obj, (value) => this._updateLatestValue(obj, value));
    }
    _selectStrategy(obj) {
        if (ɵisPromise(obj)) {
            return _promiseStrategy;
        }
        if (ɵisSubscribable(obj)) {
            return _subscribableStrategy;
        }
        throw invalidPipeArgumentError(AsyncPipe, obj);
    }
    _dispose() {
        this._strategy.dispose(this._subscription);
        this._latestValue = null;
        this._subscription = null;
        this._obj = null;
    }
    _updateLatestValue(async, value) {
        if (async === this._obj) {
            this._latestValue = value;
            this._ref.markForCheck();
        }
    }
}
AsyncPipe.decorators = [
    { type: Pipe, args: [{ name: 'async', pure: false },] }
];
AsyncPipe.ctorParameters = () => [
    { type: ChangeDetectorRef }
];
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When a new value is emitted, the `async` pipe marks the component to be checked for\n * changes. When the component gets destroyed, the `async` pipe unsubscribes automatically to avoid\n * potential memory leaks. When the reference of the expression changes, the `async` pipe\n * automatically unsubscribes from the old `Observable` or `Promise` and subscribes to the new one.\n *\n * @usageNotes\n *\n * ### Examples\n *\n * This example binds a `Promise` to the view. Clicking the `Resolve` button resolves the\n * promise.\n *\n * {@example common/pipes/ts/async_pipe.ts region='AsyncPipePromise'}\n *\n * It's also possible to use `async` with Observables. The example below binds the `time` Observable\n * to the view. The Observable continuously updates the view with the current time.\n *\n * {@example common/pipes/ts/async_pipe.ts region='AsyncPipeObservable'}\n *\n * @publicApi\n */\n@Pipe({name: 'async', pure: false})\nexport class AsyncPipe implements OnDestroy, PipeTransform {\n  private _latestValue: any = null;\n\n  private _subscription: Unsubscribable|Promise<any>|null = null;\n  private _obj: Subscribable<any>|Promise<any>|EventEmitter<any>|null = null;\n  private _strategy: SubscriptionStrategy = null!;\n\n  constructor(private _ref: ChangeDetectorRef) {}\n\n  ngOnDestroy(): void {\n    if (this._subscription) {\n      this._dispose();\n    }\n  }\n\n  // NOTE(@benlesh): Because Observable has deprecated a few call patterns for `subscribe`,\n  // TypeScript has a hard time matching Observable to Subscribable, for more information\n  // see https://github.com/microsoft/TypeScript/issues/43643\n\n  transform<T>(obj: Observable<T>|Subscribable<T>|Promise<T>): T|null;\n  transform<T>(obj: null|undefined): null;\n  transform<T>(obj: Observable<T>|Subscribable<T>|Promise<T>|null|undefined): T|null;\n  transform<T>(obj: Observable<T>|Subscribable<T>|Promise<T>|null|undefined): T|null {\n    if (!this._obj) {\n      if (obj) {\n        this._subscribe(obj);\n      }\n      return this._latestValue;\n    }\n\n    if (obj !== this._obj) {\n      this._dispose();\n      return this.transform(obj);\n    }\n\n    return this._latestValue;\n  }\n\n  private _subscribe(obj: Subscribable<any>|Promise<any>|EventEmitter<any>): void {\n    this._obj = obj;\n    this._strategy = this._selectStrategy(obj);\n    this._subscription = this._strategy.createSubscription(\n        obj, (value: Object) => this._updateLatestValue(obj, value));\n  }\n\n  private _selectStrategy(obj: Subscribable<any>|Promise<any>|EventEmitter<any>): any {\n    if (ɵisPromise(obj)) {\n      return _promiseStrategy;\n    }\n\n    if (ɵisSubscribable(obj)) {\n      return _subscribableStrategy;\n    }\n\n    throw invalidPipeArgumentError(AsyncPipe, obj);\n  }\n\n  private _dispose(): void {\n    this._strategy.dispose(this._subscription!);\n    this._latestValue = null;\n    this._subscription = null;\n    this._obj = null;\n  }\n\n  private _updateLatestValue(async: any, value: Object): void {\n    if (async === this._obj) {\n      this._latestValue = value;\n      this._ref.markForCheck();\n    }\n  }\n}\n"]}