/**
 * @fileoverview added by tsickle
 * Generated from: packages/common/src/pipes/async_pipe.ts
 * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * @license
 * Copyright Google Inc. 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, WrappedValue, ɵisObservable, ɵisPromise, ɵlooseIdentical } from '@angular/core';
import { invalidPipeArgumentError } from './invalid_pipe_argument_error';
/**
 * @record
 */
function SubscriptionStrategy() { }
if (false) {
    /**
     * @param {?} async
     * @param {?} updateLatestValue
     * @return {?}
     */
    SubscriptionStrategy.prototype.createSubscription = function (async, updateLatestValue) { };
    /**
     * @param {?} subscription
     * @return {?}
     */
    SubscriptionStrategy.prototype.dispose = function (subscription) { };
    /**
     * @param {?} subscription
     * @return {?}
     */
    SubscriptionStrategy.prototype.onDestroy = function (subscription) { };
}
class ObservableStrategy {
    /**
     * @param {?} async
     * @param {?} updateLatestValue
     * @return {?}
     */
    createSubscription(async, updateLatestValue) {
        return async.subscribe({ next: updateLatestValue, error: (/**
             * @param {?} e
             * @return {?}
             */
            (e) => { throw e; }) });
    }
    /**
     * @param {?} subscription
     * @return {?}
     */
    dispose(subscription) { subscription.unsubscribe(); }
    /**
     * @param {?} subscription
     * @return {?}
     */
    onDestroy(subscription) { subscription.unsubscribe(); }
}
class PromiseStrategy {
    /**
     * @param {?} async
     * @param {?} updateLatestValue
     * @return {?}
     */
    createSubscription(async, updateLatestValue) {
        return async.then(updateLatestValue, (/**
         * @param {?} e
         * @return {?}
         */
        e => { throw e; }));
    }
    /**
     * @param {?} subscription
     * @return {?}
     */
    dispose(subscription) { }
    /**
     * @param {?} subscription
     * @return {?}
     */
    onDestroy(subscription) { }
}
/** @type {?} */
const _promiseStrategy = new PromiseStrategy();
/** @type {?} */
const _observableStrategy = new ObservableStrategy();
/**
 * \@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.
 *
 * \@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 {
    /**
     * @param {?} _ref
     */
    constructor(_ref) {
        this._ref = _ref;
        this._latestValue = null;
        this._latestReturnedValue = null;
        this._subscription = null;
        this._obj = null;
        this._strategy = (/** @type {?} */ (null));
    }
    /**
     * @return {?}
     */
    ngOnDestroy() {
        if (this._subscription) {
            this._dispose();
        }
    }
    /**
     * @param {?} obj
     * @return {?}
     */
    transform(obj) {
        if (!this._obj) {
            if (obj) {
                this._subscribe(obj);
            }
            this._latestReturnedValue = this._latestValue;
            return this._latestValue;
        }
        if (obj !== this._obj) {
            this._dispose();
            return this.transform((/** @type {?} */ (obj)));
        }
        if (ɵlooseIdentical(this._latestValue, this._latestReturnedValue)) {
            return this._latestReturnedValue;
        }
        this._latestReturnedValue = this._latestValue;
        return WrappedValue.wrap(this._latestValue);
    }
    /**
     * @private
     * @param {?} obj
     * @return {?}
     */
    _subscribe(obj) {
        this._obj = obj;
        this._strategy = this._selectStrategy(obj);
        this._subscription = this._strategy.createSubscription(obj, (/**
         * @param {?} value
         * @return {?}
         */
        (value) => this._updateLatestValue(obj, value)));
    }
    /**
     * @private
     * @param {?} obj
     * @return {?}
     */
    _selectStrategy(obj) {
        if (ɵisPromise(obj)) {
            return _promiseStrategy;
        }
        if (ɵisObservable(obj)) {
            return _observableStrategy;
        }
        throw invalidPipeArgumentError(AsyncPipe, obj);
    }
    /**
     * @private
     * @return {?}
     */
    _dispose() {
        this._strategy.dispose((/** @type {?} */ (this._subscription)));
        this._latestValue = null;
        this._latestReturnedValue = null;
        this._subscription = null;
        this._obj = null;
    }
    /**
     * @private
     * @param {?} async
     * @param {?} value
     * @return {?}
     */
    _updateLatestValue(async, value) {
        if (async === this._obj) {
            this._latestValue = value;
            this._ref.markForCheck();
        }
    }
}
AsyncPipe.decorators = [
    { type: Pipe, args: [{ name: 'async', pure: false },] }
];
/** @nocollapse */
AsyncPipe.ctorParameters = () => [
    { type: ChangeDetectorRef }
];
if (false) {
    /**
     * @type {?}
     * @private
     */
    AsyncPipe.prototype._latestValue;
    /**
     * @type {?}
     * @private
     */
    AsyncPipe.prototype._latestReturnedValue;
    /**
     * @type {?}
     * @private
     */
    AsyncPipe.prototype._subscription;
    /**
     * @type {?}
     * @private
     */
    AsyncPipe.prototype._obj;
    /**
     * @type {?}
     * @private
     */
    AsyncPipe.prototype._strategy;
    /**
     * @type {?}
     * @private
     */
    AsyncPipe.prototype._ref;
}
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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ChangeDetectorRef, EventEmitter, OnDestroy, Pipe, PipeTransform, WrappedValue, ɵisObservable, ɵisPromise, ɵlooseIdentical} from '@angular/core';\nimport {Observable, SubscriptionLike} from 'rxjs';\nimport {invalidPipeArgumentError} from './invalid_pipe_argument_error';\n\ninterface SubscriptionStrategy {\n  createSubscription(async: Observable<any>|Promise<any>, updateLatestValue: any): SubscriptionLike\n      |Promise<any>;\n  dispose(subscription: SubscriptionLike|Promise<any>): void;\n  onDestroy(subscription: SubscriptionLike|Promise<any>): void;\n}\n\nclass ObservableStrategy implements SubscriptionStrategy {\n  createSubscription(async: Observable<any>, updateLatestValue: any): SubscriptionLike {\n    return async.subscribe({next: updateLatestValue, error: (e: any) => { throw e; }});\n  }\n\n  dispose(subscription: SubscriptionLike): void { subscription.unsubscribe(); }\n\n  onDestroy(subscription: SubscriptionLike): void { subscription.unsubscribe(); }\n}\n\nclass PromiseStrategy implements SubscriptionStrategy {\n  createSubscription(async: Promise<any>, updateLatestValue: (v: any) => any): Promise<any> {\n    return async.then(updateLatestValue, e => { throw e; });\n  }\n\n  dispose(subscription: Promise<any>): void {}\n\n  onDestroy(subscription: Promise<any>): void {}\n}\n\nconst _promiseStrategy = new PromiseStrategy();\nconst _observableStrategy = new ObservableStrategy();\n\n/**\n * @ngModule CommonModule\n * @description\n *\n * Unwraps a value from an asynchronous primitive.\n *\n * The `async` pipe subscribes to an `Observable` or `Promise` and returns the latest value it has\n * emitted. 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.\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  private _latestReturnedValue: any = null;\n\n  private _subscription: SubscriptionLike|Promise<any>|null = null;\n  private _obj: Observable<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  transform<T>(obj: null): null;\n  transform<T>(obj: undefined): undefined;\n  transform<T>(obj: Observable<T>|null|undefined): T|null;\n  transform<T>(obj: Promise<T>|null|undefined): T|null;\n  transform(obj: Observable<any>|Promise<any>|null|undefined): any {\n    if (!this._obj) {\n      if (obj) {\n        this._subscribe(obj);\n      }\n      this._latestReturnedValue = this._latestValue;\n      return this._latestValue;\n    }\n\n    if (obj !== this._obj) {\n      this._dispose();\n      return this.transform(obj as any);\n    }\n\n    if (ɵlooseIdentical(this._latestValue, this._latestReturnedValue)) {\n      return this._latestReturnedValue;\n    }\n\n    this._latestReturnedValue = this._latestValue;\n    return WrappedValue.wrap(this._latestValue);\n  }\n\n  private _subscribe(obj: Observable<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: Observable<any>|Promise<any>|EventEmitter<any>): any {\n    if (ɵisPromise(obj)) {\n      return _promiseStrategy;\n    }\n\n    if (ɵisObservable(obj)) {\n      return _observableStrategy;\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._latestReturnedValue = 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"]}