179 lines
6.6 KiB
JavaScript
Executable File
179 lines
6.6 KiB
JavaScript
Executable File
/** PURE_IMPORTS_START .._util_subscribeToResult,.._OuterSubscriber PURE_IMPORTS_END */
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b)
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if (b.hasOwnProperty(p))
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d[p] = b[p];
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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import { subscribeToResult } from '../util/subscribeToResult';
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import { OuterSubscriber } from '../OuterSubscriber';
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/* tslint:enable:max-line-length */
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/**
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* Projects each source value to an Observable which is merged in the output
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* Observable.
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*
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* <span class="informal">Maps each value to an Observable, then flattens all of
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* these inner Observables using {@link mergeAll}.</span>
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*
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* <img src="./img/mergeMap.png" width="100%">
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*
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* Returns an Observable that emits items based on applying a function that you
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* supply to each item emitted by the source Observable, where that function
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* returns an Observable, and then merging those resulting Observables and
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* emitting the results of this merger.
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*
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* @example <caption>Map and flatten each letter to an Observable ticking every 1 second</caption>
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* var letters = Rx.Observable.of('a', 'b', 'c');
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* var result = letters.mergeMap(x =>
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* Rx.Observable.interval(1000).map(i => x+i)
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* );
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* result.subscribe(x => console.log(x));
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*
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* // Results in the following:
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* // a0
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* // b0
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* // c0
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* // a1
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* // b1
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* // c1
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* // continues to list a,b,c with respective ascending integers
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*
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* @see {@link concatMap}
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* @see {@link exhaustMap}
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* @see {@link merge}
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* @see {@link mergeAll}
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* @see {@link mergeMapTo}
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* @see {@link mergeScan}
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* @see {@link switchMap}
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*
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* @param {function(value: T, ?index: number): ObservableInput} project A function
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* that, when applied to an item emitted by the source Observable, returns an
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* Observable.
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* @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
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* A function to produce the value on the output Observable based on the values
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* and the indices of the source (outer) emission and the inner Observable
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* emission. The arguments passed to this function are:
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* - `outerValue`: the value that came from the source
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* - `innerValue`: the value that came from the projected Observable
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* - `outerIndex`: the "index" of the value that came from the source
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* - `innerIndex`: the "index" of the value from the projected Observable
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* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
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* Observables being subscribed to concurrently.
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* @return {Observable} An Observable that emits the result of applying the
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* projection function (and the optional `resultSelector`) to each item emitted
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* by the source Observable and merging the results of the Observables obtained
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* from this transformation.
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* @method mergeMap
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* @owner Observable
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*/
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export function mergeMap(project, resultSelector, concurrent) {
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if (concurrent === void 0) {
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concurrent = Number.POSITIVE_INFINITY;
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}
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return function mergeMapOperatorFunction(source) {
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if (typeof resultSelector === 'number') {
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concurrent = resultSelector;
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resultSelector = null;
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}
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return source.lift(new MergeMapOperator(project, resultSelector, concurrent));
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};
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}
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export var MergeMapOperator = /*@__PURE__*/ (/*@__PURE__*/ function () {
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function MergeMapOperator(project, resultSelector, concurrent) {
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if (concurrent === void 0) {
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concurrent = Number.POSITIVE_INFINITY;
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}
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this.project = project;
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this.resultSelector = resultSelector;
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this.concurrent = concurrent;
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}
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MergeMapOperator.prototype.call = function (observer, source) {
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return source.subscribe(new MergeMapSubscriber(observer, this.project, this.resultSelector, this.concurrent));
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};
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return MergeMapOperator;
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}());
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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export var MergeMapSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
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__extends(MergeMapSubscriber, _super);
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function MergeMapSubscriber(destination, project, resultSelector, concurrent) {
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if (concurrent === void 0) {
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concurrent = Number.POSITIVE_INFINITY;
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}
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_super.call(this, destination);
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this.project = project;
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this.resultSelector = resultSelector;
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this.concurrent = concurrent;
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this.hasCompleted = false;
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this.buffer = [];
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this.active = 0;
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this.index = 0;
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}
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MergeMapSubscriber.prototype._next = function (value) {
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if (this.active < this.concurrent) {
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this._tryNext(value);
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}
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else {
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this.buffer.push(value);
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}
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};
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MergeMapSubscriber.prototype._tryNext = function (value) {
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var result;
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var index = this.index++;
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try {
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result = this.project(value, index);
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}
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catch (err) {
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this.destination.error(err);
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return;
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}
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this.active++;
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this._innerSub(result, value, index);
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};
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MergeMapSubscriber.prototype._innerSub = function (ish, value, index) {
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this.add(subscribeToResult(this, ish, value, index));
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};
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MergeMapSubscriber.prototype._complete = function () {
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this.hasCompleted = true;
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if (this.active === 0 && this.buffer.length === 0) {
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this.destination.complete();
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}
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};
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MergeMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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if (this.resultSelector) {
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this._notifyResultSelector(outerValue, innerValue, outerIndex, innerIndex);
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}
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else {
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this.destination.next(innerValue);
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}
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};
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MergeMapSubscriber.prototype._notifyResultSelector = function (outerValue, innerValue, outerIndex, innerIndex) {
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var result;
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try {
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result = this.resultSelector(outerValue, innerValue, outerIndex, innerIndex);
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}
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catch (err) {
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this.destination.error(err);
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return;
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}
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this.destination.next(result);
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};
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MergeMapSubscriber.prototype.notifyComplete = function (innerSub) {
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var buffer = this.buffer;
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this.remove(innerSub);
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this.active--;
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if (buffer.length > 0) {
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this._next(buffer.shift());
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}
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else if (this.active === 0 && this.hasCompleted) {
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this.destination.complete();
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}
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};
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return MergeMapSubscriber;
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}(OuterSubscriber));
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//# sourceMappingURL=mergeMap.js.map
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