Code coverage report for src/operator/switchFirstMap.ts

Statements: 100% (51 / 51)      Branches: 100% (12 / 12)      Functions: 100% (11 / 11)      Lines: 100% (48 / 48)      Ignored: none     

All files » src/operator/ » switchFirstMap.ts
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87      1 1 1 1   1         17     1 17 17           1 17   1   1 17 17 17   1 17 17 17     1 30 22 22 22 22 1   21 21         1 9 9 4       1 45 45 10 10 1   9     35       1 2     1 13 13 2     1  
import {Operator} from '../Operator';
import {Observable} from '../Observable';
import {Subscriber} from '../Subscriber';
import {tryCatch} from '../util/tryCatch';
import {errorObject} from '../util/errorObject';
import {OuterSubscriber} from '../OuterSubscriber';
import {subscribeToResult} from '../util/subscribeToResult';
 
export function switchFirstMap<T, R, R2>(project: (value: T, index: number) => Observable<R>,
                                         resultSelector?: (outerValue: T,
                                                           innerValue: R,
                                                           outerIndex: number,
                                                           innerIndex: number) => R2): Observable<R> {
  return this.lift(new SwitchFirstMapOperator(project, resultSelector));
}
 
class SwitchFirstMapOperator<T, R, R2> implements Operator<T, R> {
  constructor(private project: (value: T, index: number) => Observable<R>,
              private resultSelector?: (outerValue: T,
                                        innerValue: R,
                                        outerIndex: number,
                                        innerIndex: number) => R2) {
  }
 
  call(subscriber: Subscriber<R>): Subscriber<T> {
    return new SwitchFirstMapSubscriber(subscriber, this.project, this.resultSelector);
  }
}
 
class SwitchFirstMapSubscriber<T, R, R2> extends OuterSubscriber<T, R> {
  private hasSubscription: boolean = false;
  private hasCompleted: boolean = false;
  private index: number = 0;
 
  constructor(destination: Subscriber<R>,
              private project: (value: T, index: number) => Observable<R>,
              private resultSelector?: (outerValue: T, innerValue: R, outerIndex: number, innerIndex: number) => R2) {
    super(destination);
  }
 
  _next(value: T): void {
    if (!this.hasSubscription) {
      const index = this.index++;
      const destination = this.destination;
      let result = tryCatch(this.project)(value, index);
      if (result === errorObject) {
        destination.error(result.e);
      } else {
        this.hasSubscription = true;
        this.add(subscribeToResult(this, result, value, index));
      }
    }
  }
 
  _complete(): void {
    this.hasCompleted = true;
    if (!this.hasSubscription) {
      this.destination.complete();
    }
  }
 
  notifyNext(outerValue: T, innerValue: R, outerIndex: number, innerIndex: number): void {
    const { resultSelector, destination } = this;
    if (resultSelector) {
      const result = tryCatch(resultSelector)(outerValue, innerValue, outerIndex, innerIndex);
      if (result === errorObject) {
        destination.error(errorObject.e);
      } else {
        destination.next(result);
      }
    } else {
      destination.next(innerValue);
    }
  }
 
  notifyError(err: any): void {
    this.destination.error(err);
  }
 
  notifyComplete(): void {
    this.hasSubscription = false;
    if (this.hasCompleted) {
      this.destination.complete();
    }
  }
}