You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.6 KiB
50 lines
1.6 KiB
import { Observable } from '../Observable'; |
|
import { subscribeToResult } from '../util/subscribeToResult'; |
|
import { OuterSubscriber } from '../OuterSubscriber'; |
|
/** |
|
* We need this JSDoc comment for affecting ESDoc. |
|
* @extends {Ignored} |
|
* @hide true |
|
*/ |
|
export class IfObservable extends Observable { |
|
constructor(condition, thenSource, elseSource) { |
|
super(); |
|
this.condition = condition; |
|
this.thenSource = thenSource; |
|
this.elseSource = elseSource; |
|
} |
|
static create(condition, thenSource, elseSource) { |
|
return new IfObservable(condition, thenSource, elseSource); |
|
} |
|
/** @deprecated internal use only */ _subscribe(subscriber) { |
|
const { condition, thenSource, elseSource } = this; |
|
return new IfSubscriber(subscriber, condition, thenSource, elseSource); |
|
} |
|
} |
|
class IfSubscriber extends OuterSubscriber { |
|
constructor(destination, condition, thenSource, elseSource) { |
|
super(destination); |
|
this.condition = condition; |
|
this.thenSource = thenSource; |
|
this.elseSource = elseSource; |
|
this.tryIf(); |
|
} |
|
tryIf() { |
|
const { condition, thenSource, elseSource } = this; |
|
let result; |
|
try { |
|
result = condition(); |
|
const source = result ? thenSource : elseSource; |
|
if (source) { |
|
this.add(subscribeToResult(this, source)); |
|
} |
|
else { |
|
this._complete(); |
|
} |
|
} |
|
catch (err) { |
|
this._error(err); |
|
} |
|
} |
|
} |
|
//# sourceMappingURL=IfObservable.js.map
|