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