108 lines
4.5 KiB
JavaScript
108 lines
4.5 KiB
JavaScript
"use strict";
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b) if (b.hasOwnProperty(p)) 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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var tryCatch_1 = require('../util/tryCatch');
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var errorObject_1 = require('../util/errorObject');
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var OuterSubscriber_1 = require('../OuterSubscriber');
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var subscribeToResult_1 = require('../util/subscribeToResult');
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/**
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* Returns an Observable where for each item in the source Observable, the supplied function is applied to each item,
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* resulting in a new value to then be applied again with the function.
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* @param {function} project the function for projecting the next emitted item of the Observable.
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* @param {number} [concurrent] the max number of observables that can be created concurrently. defaults to infinity.
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* @param {Scheduler} [scheduler] The Scheduler to use for managing the expansions.
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* @returns {Observable} an Observable containing the expansions of the source Observable.
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*/
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function expand(project, concurrent, scheduler) {
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if (concurrent === void 0) { concurrent = Number.POSITIVE_INFINITY; }
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if (scheduler === void 0) { scheduler = undefined; }
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concurrent = (concurrent || 0) < 1 ? Number.POSITIVE_INFINITY : concurrent;
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return this.lift(new ExpandOperator(project, concurrent, scheduler));
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}
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exports.expand = expand;
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var ExpandOperator = (function () {
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function ExpandOperator(project, concurrent, scheduler) {
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this.project = project;
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this.concurrent = concurrent;
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this.scheduler = scheduler;
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}
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ExpandOperator.prototype.call = function (subscriber) {
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return new ExpandSubscriber(subscriber, this.project, this.concurrent, this.scheduler);
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};
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return ExpandOperator;
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}());
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exports.ExpandOperator = ExpandOperator;
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var ExpandSubscriber = (function (_super) {
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__extends(ExpandSubscriber, _super);
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function ExpandSubscriber(destination, project, concurrent, scheduler) {
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_super.call(this, destination);
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this.project = project;
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this.concurrent = concurrent;
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this.scheduler = scheduler;
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this.index = 0;
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this.active = 0;
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this.hasCompleted = false;
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if (concurrent < Number.POSITIVE_INFINITY) {
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this.buffer = [];
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}
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}
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ExpandSubscriber.dispatch = function (_a) {
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var subscriber = _a.subscriber, result = _a.result, value = _a.value, index = _a.index;
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subscriber.subscribeToProjection(result, value, index);
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};
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ExpandSubscriber.prototype._next = function (value) {
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var destination = this.destination;
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if (destination.isUnsubscribed) {
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this._complete();
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return;
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}
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var index = this.index++;
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if (this.active < this.concurrent) {
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destination.next(value);
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var result = tryCatch_1.tryCatch(this.project)(value, index);
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if (result === errorObject_1.errorObject) {
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destination.error(errorObject_1.errorObject.e);
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}
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else if (!this.scheduler) {
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this.subscribeToProjection(result, value, index);
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}
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else {
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var state = { subscriber: this, result: result, value: value, index: index };
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this.add(this.scheduler.schedule(ExpandSubscriber.dispatch, 0, state));
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}
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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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ExpandSubscriber.prototype.subscribeToProjection = function (result, value, index) {
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this.active++;
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this.add(subscribeToResult_1.subscribeToResult(this, result, value, index));
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};
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ExpandSubscriber.prototype._complete = function () {
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this.hasCompleted = true;
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if (this.hasCompleted && this.active === 0) {
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this.destination.complete();
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}
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};
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ExpandSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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this._next(innerValue);
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};
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ExpandSubscriber.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 && buffer.length > 0) {
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this._next(buffer.shift());
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}
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if (this.hasCompleted && this.active === 0) {
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this.destination.complete();
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}
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};
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return ExpandSubscriber;
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}(OuterSubscriber_1.OuterSubscriber));
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exports.ExpandSubscriber = ExpandSubscriber;
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//# sourceMappingURL=expand.js.map
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