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node_modules/rxjs/_esm2015/operators/switchMapTo.js

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+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 (source) => source.lift(new SwitchMapToOperator(innerObservable, resultSelector));
+}
+class SwitchMapToOperator {
+    constructor(observable, resultSelector) {
+        this.observable = observable;
+        this.resultSelector = resultSelector;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new SwitchMapToSubscriber(subscriber, this.observable, this.resultSelector));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class SwitchMapToSubscriber extends OuterSubscriber {
+    constructor(destination, inner, resultSelector) {
+        super(destination);
+        this.inner = inner;
+        this.resultSelector = resultSelector;
+        this.index = 0;
+    }
+    _next(value) {
+        const innerSubscription = this.innerSubscription;
+        if (innerSubscription) {
+            innerSubscription.unsubscribe();
+        }
+        this.add(this.innerSubscription = subscribeToResult(this, this.inner, value, this.index++));
+    }
+    _complete() {
+        const { innerSubscription } = this;
+        if (!innerSubscription || innerSubscription.closed) {
+            super._complete();
+        }
+    }
+    /** @deprecated internal use only */ _unsubscribe() {
+        this.innerSubscription = null;
+    }
+    notifyComplete(innerSub) {
+        this.remove(innerSub);
+        this.innerSubscription = null;
+        if (this.isStopped) {
+            super._complete();
+        }
+    }
+    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        const { resultSelector, destination } = this;
+        if (resultSelector) {
+            this.tryResultSelector(outerValue, innerValue, outerIndex, innerIndex);
+        }
+        else {
+            destination.next(innerValue);
+        }
+    }
+    tryResultSelector(outerValue, innerValue, outerIndex, innerIndex) {
+        const { resultSelector, destination } = this;
+        let result;
+        try {
+            result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);
+        }
+        catch (err) {
+            destination.error(err);
+            return;
+        }
+        destination.next(result);
+    }
+}
+//# sourceMappingURL=switchMapTo.js.map