@angular/common
Version:
Angular - commonly needed directives and services
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JavaScript
/**
* @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 * as tslib_1 from "tslib";
import { ChangeDetectorRef, Injectable, Pipe, WrappedValue, ɵisObservable, ɵisPromise, ɵlooseIdentical } from '@angular/core';
import { invalidPipeArgumentError } from './invalid_pipe_argument_error';
var ObservableStrategy = /** @class */ (function () {
function ObservableStrategy() {
}
ObservableStrategy.prototype.createSubscription = function (async, updateLatestValue) {
return async.subscribe({ next: updateLatestValue, error: function (e) { throw e; } });
};
ObservableStrategy.prototype.dispose = function (subscription) { subscription.unsubscribe(); };
ObservableStrategy.prototype.onDestroy = function (subscription) { subscription.unsubscribe(); };
return ObservableStrategy;
}());
var PromiseStrategy = /** @class */ (function () {
function PromiseStrategy() {
}
PromiseStrategy.prototype.createSubscription = function (async, updateLatestValue) {
return async.then(updateLatestValue, function (e) { throw e; });
};
PromiseStrategy.prototype.dispose = function (subscription) { };
PromiseStrategy.prototype.onDestroy = function (subscription) { };
return PromiseStrategy;
}());
var _promiseStrategy = new PromiseStrategy();
var _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
*/
var AsyncPipe = /** @class */ (function () {
function AsyncPipe(_ref) {
this._ref = _ref;
this._latestValue = null;
this._latestReturnedValue = null;
this._subscription = null;
this._obj = null;
this._strategy = null;
}
AsyncPipe_1 = AsyncPipe;
AsyncPipe.prototype.ngOnDestroy = function () {
if (this._subscription) {
this._dispose();
}
};
AsyncPipe.prototype.transform = function (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(obj);
}
if (ɵlooseIdentical(this._latestValue, this._latestReturnedValue)) {
return this._latestReturnedValue;
}
this._latestReturnedValue = this._latestValue;
return WrappedValue.wrap(this._latestValue);
};
AsyncPipe.prototype._subscribe = function (obj) {
var _this = this;
this._obj = obj;
this._strategy = this._selectStrategy(obj);
this._subscription = this._strategy.createSubscription(obj, function (value) { return _this._updateLatestValue(obj, value); });
};
AsyncPipe.prototype._selectStrategy = function (obj) {
if (ɵisPromise(obj)) {
return _promiseStrategy;
}
if (ɵisObservable(obj)) {
return _observableStrategy;
}
throw invalidPipeArgumentError(AsyncPipe_1, obj);
};
AsyncPipe.prototype._dispose = function () {
this._strategy.dispose(this._subscription);
this._latestValue = null;
this._latestReturnedValue = null;
this._subscription = null;
this._obj = null;
};
AsyncPipe.prototype._updateLatestValue = function (async, value) {
if (async === this._obj) {
this._latestValue = value;
this._ref.markForCheck();
}
};
var AsyncPipe_1;
AsyncPipe = AsyncPipe_1 = tslib_1.__decorate([
Injectable(),
Pipe({ name: 'async', pure: false }),
tslib_1.__metadata("design:paramtypes", [ChangeDetectorRef])
], AsyncPipe);
return AsyncPipe;
}());
export { AsyncPipe };
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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, Injectable, 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@Injectable()\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"]}