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8.2 KiB
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8.2 KiB
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The condition any source emitted item has to satisfy.\n * @return {Observable} An Observable that emits only the last item satisfying the given condition\n * from the source, or an NoSuchElementException if no such items are emitted.\n * @throws - Throws if no items that match the predicate are emitted by the source Observable.\n * @method last\n * @owner Observable\n */\nexport function last<T, R>(predicate?: (value: T, index: number, source: Observable<T>) => boolean,\n resultSelector?: ((value: T, index: number) => R) | void,\n defaultValue?: R): OperatorFunction<T, T | R> {\n return (source: Observable<T>) => source.lift(new LastOperator(predicate, resultSelector, defaultValue, source));\n}\n\nclass LastOperator<T, R> implements Operator<T, R> {\n constructor(private predicate?: (value: T, index: number, source: Observable<T>) => boolean,\n private resultSelector?: ((value: T, index: number) => R) | void,\n private defaultValue?: any,\n private source?: Observable<T>) {\n }\n\n call(observer: Subscriber<R>, source: any): any {\n return source.subscribe(new LastSubscriber(observer, this.predicate, this.resultSelector, this.defaultValue, this.source));\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass LastSubscriber<T, R> extends Subscriber<T> {\n private lastValue: T | R;\n private hasValue: boolean = false;\n private index: number = 0;\n\n constructor(destination: Subscriber<R>,\n private predicate?: (value: T, index: number, source: Observable<T>) => boolean,\n private resultSelector?: ((value: T, index: number) => R) | void,\n private defaultValue?: any,\n private source?: Observable<T>) {\n super(destination);\n if (typeof defaultValue !== 'undefined') {\n this.lastValue = defaultValue;\n this.hasValue = true;\n }\n }\n\n protected _next(value: T): void {\n const index = this.index++;\n if (this.predicate) {\n this._tryPredicate(value, index);\n } else {\n if (this.resultSelector) {\n this._tryResultSelector(value, index);\n return;\n }\n this.lastValue = value;\n this.hasValue = true;\n }\n }\n\n private _tryPredicate(value: T, index: number) {\n let result: any;\n try {\n result = this.predicate(value, index, this.source);\n } catch (err) {\n this.destination.error(err);\n return;\n }\n if (result) {\n if (this.resultSelector) {\n this._tryResultSelector(value, index);\n return;\n }\n this.lastValue = value;\n this.hasValue = true;\n }\n }\n\n private _tryResultSelector(value: T, index: number) {\n let result: any;\n try {\n result = (<any>this).resultSelector(value, index);\n } catch (err) {\n this.destination.error(err);\n return;\n }\n this.lastValue = result;\n this.hasValue = true;\n }\n\n protected _complete(): void {\n const destination = this.destination;\n if (this.hasValue) {\n destination.next(this.lastValue);\n destination.complete();\n } else {\n destination.error(new EmptyError);\n }\n }\n}\n"]} |