| /** PURE_IMPORTS_START .._OuterSubscriber,.._util_subscribeToResult PURE_IMPORTS_END */ |
| var __extends = (this && this.__extends) || function (d, b) { |
| for (var p in b) |
| if (b.hasOwnProperty(p)) |
| d[p] = b[p]; |
| function __() { this.constructor = d; } |
| d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __()); |
| }; |
| import { OuterSubscriber } from '../OuterSubscriber'; |
| import { subscribeToResult } from '../util/subscribeToResult'; |
| /* tslint:enable:max-line-length */ |
| /** |
| * Projects each source value to the same Observable which is flattened multiple |
| * times with {@link switch} in the output Observable. |
| * |
| * <span class="informal">It's like {@link switchMap}, but maps each value |
| * always to the same inner Observable.</span> |
| * |
| * <img src="./img/switchMapTo.png" width="100%"> |
| * |
| * Maps each source value to the given Observable `innerObservable` regardless |
| * of the source value, and then flattens those resulting Observables into one |
| * single Observable, which is the output Observable. The output Observables |
| * emits values only from the most recently emitted instance of |
| * `innerObservable`. |
| * |
| * @example <caption>Rerun an interval Observable on every click event</caption> |
| * var clicks = Rx.Observable.fromEvent(document, 'click'); |
| * var result = clicks.switchMapTo(Rx.Observable.interval(1000)); |
| * result.subscribe(x => console.log(x)); |
| * |
| * @see {@link concatMapTo} |
| * @see {@link switch} |
| * @see {@link switchMap} |
| * @see {@link mergeMapTo} |
| * |
| * @param {ObservableInput} innerObservable An Observable to replace each value from |
| * the source Observable. |
| * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector] |
| * A function to produce the value on the output Observable based on the values |
| * and the indices of the source (outer) emission and the inner Observable |
| * emission. The arguments passed to this function are: |
| * - `outerValue`: the value that came from the source |
| * - `innerValue`: the value that came from the projected Observable |
| * - `outerIndex`: the "index" of the value that came from the source |
| * - `innerIndex`: the "index" of the value from the projected Observable |
| * @return {Observable} An Observable that emits items from the given |
| * `innerObservable` (and optionally transformed through `resultSelector`) every |
| * time a value is emitted on the source Observable, and taking only the values |
| * from the most recently projected inner Observable. |
| * @method switchMapTo |
| * @owner Observable |
| */ |
| export function switchMapTo(innerObservable, resultSelector) { |
| return function (source) { return source.lift(new SwitchMapToOperator(innerObservable, resultSelector)); }; |
| } |
| var SwitchMapToOperator = /*@__PURE__*/ (/*@__PURE__*/ function () { |
| function SwitchMapToOperator(observable, resultSelector) { |
| this.observable = observable; |
| this.resultSelector = resultSelector; |
| } |
| SwitchMapToOperator.prototype.call = function (subscriber, source) { |
| return source.subscribe(new SwitchMapToSubscriber(subscriber, this.observable, this.resultSelector)); |
| }; |
| return SwitchMapToOperator; |
| }()); |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @ignore |
| * @extends {Ignored} |
| */ |
| var SwitchMapToSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) { |
| __extends(SwitchMapToSubscriber, _super); |
| function SwitchMapToSubscriber(destination, inner, resultSelector) { |
| _super.call(this, destination); |
| this.inner = inner; |
| this.resultSelector = resultSelector; |
| this.index = 0; |
| } |
| SwitchMapToSubscriber.prototype._next = function (value) { |
| var innerSubscription = this.innerSubscription; |
| if (innerSubscription) { |
| innerSubscription.unsubscribe(); |
| } |
| this.add(this.innerSubscription = subscribeToResult(this, this.inner, value, this.index++)); |
| }; |
| SwitchMapToSubscriber.prototype._complete = function () { |
| var innerSubscription = this.innerSubscription; |
| if (!innerSubscription || innerSubscription.closed) { |
| _super.prototype._complete.call(this); |
| } |
| }; |
| SwitchMapToSubscriber.prototype._unsubscribe = function () { |
| this.innerSubscription = null; |
| }; |
| SwitchMapToSubscriber.prototype.notifyComplete = function (innerSub) { |
| this.remove(innerSub); |
| this.innerSubscription = null; |
| if (this.isStopped) { |
| _super.prototype._complete.call(this); |
| } |
| }; |
| SwitchMapToSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) { |
| var _a = this, resultSelector = _a.resultSelector, destination = _a.destination; |
| if (resultSelector) { |
| this.tryResultSelector(outerValue, innerValue, outerIndex, innerIndex); |
| } |
| else { |
| destination.next(innerValue); |
| } |
| }; |
| SwitchMapToSubscriber.prototype.tryResultSelector = function (outerValue, innerValue, outerIndex, innerIndex) { |
| var _a = this, resultSelector = _a.resultSelector, destination = _a.destination; |
| var result; |
| try { |
| result = resultSelector(outerValue, innerValue, outerIndex, innerIndex); |
| } |
| catch (err) { |
| destination.error(err); |
| return; |
| } |
| destination.next(result); |
| }; |
| return SwitchMapToSubscriber; |
| }(OuterSubscriber)); |
| //# sourceMappingURL=switchMapTo.js.map |