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| 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 | 25x 25x 25x 3x 4x 4x 1x 3x 3x 3x 3x 3x 3x 3x 3x | import { presentCheck, promisorCheck } from "@jonloucks/contracts-ts/auxiliary/Checks";
import { Promisor } from "@jonloucks/contracts-ts/api/Promisor";
import { isNotPresent, OptionalType, RequiredType, Transform } from "@jonloucks/contracts-ts/api/Types";
/**
* Factory method to create an ExtractPromisorImpl which is extraction promisor
*
* @param referent the source promisor
* @param transform the transform function to extract the new value
* @param <T> the input deliverable type
* @param <R> the output deliverable type
* @returns the new Extract Promisor implementation
*/
export function create<T, R>(referent: Promisor<T>, transform: Transform<T, R>): RequiredType<Promisor<R>> {
return ExtractorPromisorImpl.internalCreate<T, R>(referent, transform);
}
// ---- Implementation details below ----
/**
* Implementation of an Extractor Promisor
* @param <T> the input deliverable type
* @param <R> the output deliverable type
*/
class ExtractorPromisorImpl<T, R> implements Promisor<R> {
/**
* Promisor.demand override.
*/
demand(): OptionalType<R> {
const referentValue = this.#referent.demand();
if (isNotPresent(referentValue)) {
return referentValue;
} else {
return this.#transform.transform(referentValue);
}
}
/**
* Promisor.incrementUsage override.
*/
incrementUsage(): number {
return this.#referent.incrementUsage();
}
/**
* Promisor.decrementUsage override.
*/
decrementUsage(): number {
return this.#referent.decrementUsage();
}
static internalCreate<T, R>(referent: Promisor<T>, transform: Transform<T, R>): RequiredType<Promisor<R>> {
return new ExtractorPromisorImpl<T, R>(referent, transform);
}
private constructor(referent: Promisor<T>, transform: Transform<T, R>) {
this.#referent = promisorCheck(referent);
this.#transform = presentCheck(transform, "Transform must be present.");
}
readonly #referent: Promisor<T>;
readonly #transform: Transform<T, R>;
} |