angular2
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Angular 2 - a web framework for modern web apps
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JavaScript
'use strict';"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var lang_1 = require('angular2/src/facade/lang');
var async_1 = require('angular2/src/facade/async');
var core_1 = require('angular2/core');
var invalid_pipe_argument_exception_1 = require('./invalid_pipe_argument_exception');
var ObservableStrategy = (function () {
function ObservableStrategy() {
}
ObservableStrategy.prototype.createSubscription = function (async, updateLatestValue) {
return async_1.ObservableWrapper.subscribe(async, updateLatestValue, function (e) { throw e; });
};
ObservableStrategy.prototype.dispose = function (subscription) { async_1.ObservableWrapper.dispose(subscription); };
ObservableStrategy.prototype.onDestroy = function (subscription) { async_1.ObservableWrapper.dispose(subscription); };
return ObservableStrategy;
}());
var PromiseStrategy = (function () {
function PromiseStrategy() {
}
PromiseStrategy.prototype.createSubscription = function (async, updateLatestValue) {
return async.then(updateLatestValue);
};
PromiseStrategy.prototype.dispose = function (subscription) { };
PromiseStrategy.prototype.onDestroy = function (subscription) { };
return PromiseStrategy;
}());
var _promiseStrategy = new PromiseStrategy();
var _observableStrategy = new ObservableStrategy();
var __unused; // avoid unused import when Promise union types are erased
/**
* 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.
*
* ### Example
*
* This example binds a `Promise` to the view. Clicking the `Resolve` button resolves the
* promise.
*
* {@example core/pipes/ts/async_pipe/async_pipe_example.ts region='AsyncPipe'}
*
* It's also possible to use `async` with Observables. The example below binds the `time` Observable
* to the view. Every 500ms, the `time` Observable updates the view with the current time.
*
* ```typescript
* ```
*/
var AsyncPipe = (function () {
function AsyncPipe(_ref) {
/** @internal */
this._latestValue = null;
/** @internal */
this._latestReturnedValue = null;
/** @internal */
this._subscription = null;
/** @internal */
this._obj = null;
this._strategy = null;
this._ref = _ref;
}
AsyncPipe.prototype.ngOnDestroy = function () {
if (lang_1.isPresent(this._subscription)) {
this._dispose();
}
};
AsyncPipe.prototype.transform = function (obj) {
if (lang_1.isBlank(this._obj)) {
if (lang_1.isPresent(obj)) {
this._subscribe(obj);
}
this._latestReturnedValue = this._latestValue;
return this._latestValue;
}
if (obj !== this._obj) {
this._dispose();
return this.transform(obj);
}
if (this._latestValue === this._latestReturnedValue) {
return this._latestReturnedValue;
}
else {
this._latestReturnedValue = this._latestValue;
return core_1.WrappedValue.wrap(this._latestValue);
}
};
/** @internal */
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); });
};
/** @internal */
AsyncPipe.prototype._selectStrategy = function (obj) {
if (lang_1.isPromise(obj)) {
return _promiseStrategy;
}
else if (async_1.ObservableWrapper.isObservable(obj)) {
return _observableStrategy;
}
else {
throw new invalid_pipe_argument_exception_1.InvalidPipeArgumentException(AsyncPipe, obj);
}
};
/** @internal */
AsyncPipe.prototype._dispose = function () {
this._strategy.dispose(this._subscription);
this._latestValue = null;
this._latestReturnedValue = null;
this._subscription = null;
this._obj = null;
};
/** @internal */
AsyncPipe.prototype._updateLatestValue = function (async, value) {
if (async === this._obj) {
this._latestValue = value;
this._ref.markForCheck();
}
};
AsyncPipe = __decorate([
// avoid unused import when Promise union types are erased
core_1.Pipe({ name: 'async', pure: false }),
core_1.Injectable(),
__metadata('design:paramtypes', [core_1.ChangeDetectorRef])
], AsyncPipe);
return AsyncPipe;
}());
exports.AsyncPipe = AsyncPipe;
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Clicking the `Resolve` button resolves the\n * promise.\n *\n * {@example core/pipes/ts/async_pipe/async_pipe_example.ts region='AsyncPipe'}\n *\n * It's also possible to use `async` with Observables. The example below binds the `time` Observable\n * to the view. Every 500ms, the `time` Observable updates the view with the current time.\n *\n * ```typescript\n * ```\n */\n@Pipe({name: 'async', pure: false})\n@Injectable()\nexport class AsyncPipe implements OnDestroy {\n  /** @internal */\n  _latestValue: Object = null;\n  /** @internal */\n  _latestReturnedValue: Object = null;\n\n  /** @internal */\n  _subscription: Object = null;\n  /** @internal */\n  _obj: Observable<any>| Promise<any>| EventEmitter<any> = null;\n  private _strategy: any = null;\n  /** @internal */\n  public _ref: ChangeDetectorRef;\n  constructor(_ref: ChangeDetectorRef) { this._ref = _ref; }\n\n  ngOnDestroy(): void {\n    if (isPresent(this._subscription)) {\n      this._dispose();\n    }\n  }\n\n  transform(obj: Observable<any>| Promise<any>| EventEmitter<any>): any {\n    if (isBlank(this._obj)) {\n      if (isPresent(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);\n    }\n\n    if (this._latestValue === this._latestReturnedValue) {\n      return this._latestReturnedValue;\n    } else {\n      this._latestReturnedValue = this._latestValue;\n      return WrappedValue.wrap(this._latestValue);\n    }\n  }\n\n  /** @internal */\n  _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  /** @internal */\n  _selectStrategy(obj: Observable<any>| Promise<any>| EventEmitter<any>): any {\n    if (isPromise(obj)) {\n      return _promiseStrategy;\n    } else if (ObservableWrapper.isObservable(obj)) {\n      return _observableStrategy;\n    } else {\n      throw new InvalidPipeArgumentException(AsyncPipe, obj);\n    }\n  }\n\n  /** @internal */\n  _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  /** @internal */\n  _updateLatestValue(async: any, value: Object) {\n    if (async === this._obj) {\n      this._latestValue = value;\n      this._ref.markForCheck();\n    }\n  }\n}\n"]}