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3.8 KiB
{"version":3,"file":"defaultIfEmpty.js","sourceRoot":"","sources":["../../src/operators/defaultIfEmpty.ts"],"names":[],"mappings":";;;;;;AAEA,2BAA2B,eAAe,CAAC,CAAA;AAM3C,mCAAmC;AAEnC;;;;;;;;;;;;;;;;;;;;;;;;;;;;;GA6BG;AACH,wBAAqC,YAAsB;IAAtB,4BAAsB,GAAtB,mBAAsB;IACzD,MAAM,CAAC,UAAC,MAAqB,IAAK,OAAA,MAAM,CAAC,IAAI,CAAC,IAAI,sBAAsB,CAAC,YAAY,CAAC,CAAsB,EAA1E,CAA0E,CAAC;AAC/G,CAAC;AAFe,sBAAc,iBAE7B,CAAA;AAED;IAEE,gCAAoB,YAAe;QAAf,iBAAY,GAAZ,YAAY,CAAG;IACnC,CAAC;IAED,qCAAI,GAAJ,UAAK,UAA6B,EAAE,MAAW;QAC7C,MAAM,CAAC,MAAM,CAAC,SAAS,CAAC,IAAI,wBAAwB,CAAC,UAAU,EAAE,IAAI,CAAC,YAAY,CAAC,CAAC,CAAC;IACvF,CAAC;IACH,6BAAC;AAAD,CAAC,AARD,IAQC;AAED;;;;GAIG;AACH;IAA6C,4CAAa;IAGxD,kCAAY,WAA8B,EAAU,YAAe;QACjE,kBAAM,WAAW,CAAC,CAAC;QAD+B,iBAAY,GAAZ,YAAY,CAAG;QAF3D,YAAO,GAAY,IAAI,CAAC;IAIhC,CAAC;IAES,wCAAK,GAAf,UAAgB,KAAQ;QACtB,IAAI,CAAC,OAAO,GAAG,KAAK,CAAC;QACrB,IAAI,CAAC,WAAW,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC;IAC/B,CAAC;IAES,4CAAS,GAAnB;QACE,EAAE,CAAC,CAAC,IAAI,CAAC,OAAO,CAAC,CAAC,CAAC;YACjB,IAAI,CAAC,WAAW,CAAC,IAAI,CAAC,IAAI,CAAC,YAAY,CAAC,CAAC;QAC3C,CAAC;QACD,IAAI,CAAC,WAAW,CAAC,QAAQ,EAAE,CAAC;IAC9B,CAAC;IACH,+BAAC;AAAD,CAAC,AAlBD,CAA6C,uBAAU,GAkBtD","sourcesContent":["import { Operator } from '../Operator';\nimport { Observable } from '../Observable';\nimport { Subscriber } from '../Subscriber';\nimport { OperatorFunction, MonoTypeOperatorFunction } from '../interfaces';\n\n/* tslint:disable:max-line-length */\nexport function defaultIfEmpty<T>(defaultValue?: T): MonoTypeOperatorFunction<T>;\nexport function defaultIfEmpty<T, R>(defaultValue?: R): OperatorFunction<T, T | R>;\n/* tslint:enable:max-line-length */\n\n/**\n * Emits a given value if the source Observable completes without emitting any\n * `next` value, otherwise mirrors the source Observable.\n *\n * <span class=\"informal\">If the source Observable turns out to be empty, then\n * this operator will emit a default value.</span>\n *\n * <img src=\"./img/defaultIfEmpty.png\" width=\"100%\">\n *\n * `defaultIfEmpty` emits the values emitted by the source Observable or a\n * specified default value if the source Observable is empty (completes without\n * having emitted any `next` value).\n *\n * @example <caption>If no clicks happen in 5 seconds, then emit \"no clicks\"</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var clicksBeforeFive = clicks.takeUntil(Rx.Observable.interval(5000));\n * var result = clicksBeforeFive.defaultIfEmpty('no clicks');\n * result.subscribe(x => console.log(x));\n *\n * @see {@link empty}\n * @see {@link last}\n *\n * @param {any} [defaultValue=null] The default value used if the source\n * Observable is empty.\n * @return {Observable} An Observable that emits either the specified\n * `defaultValue` if the source Observable emits no items, or the values emitted\n * by the source Observable.\n * @method defaultIfEmpty\n * @owner Observable\n */\nexport function defaultIfEmpty<T, R>(defaultValue: R = null): OperatorFunction<T, T | R> {\n return (source: Observable<T>) => source.lift(new DefaultIfEmptyOperator(defaultValue)) as Observable<T | R>;\n}\n\nclass DefaultIfEmptyOperator<T, R> implements Operator<T, T | R> {\n\n constructor(private defaultValue: R) {\n }\n\n call(subscriber: Subscriber<T | R>, source: any): any {\n return source.subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass DefaultIfEmptySubscriber<T, R> extends Subscriber<T> {\n private isEmpty: boolean = true;\n\n constructor(destination: Subscriber<T | R>, private defaultValue: R) {\n super(destination);\n }\n\n protected _next(value: T): void {\n this.isEmpty = false;\n this.destination.next(value);\n }\n\n protected _complete(): void {\n if (this.isEmpty) {\n this.destination.next(this.defaultValue);\n }\n this.destination.complete();\n }\n}"]} |