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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 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 63x 63x 63x 63x 63x 63x 63x 63x 63x 63x 40x 40x 40x 40x 40x 40x 40x 40x 63x 63x 63x 1x 1x | import { Linker } from './linker';
/**
* Prototype property decorator factory. Applying this decorator replaces the
* decorated prototype property with a getter, which returns the linked instance
* of a {@link Target}ed constructor, referenced by the `targetFactory`.
* Depending on the supplied `transient` value, the target constructor is
* invoked to construct (and link) an instance, if none is linked beforehand.
*
* @param targetFactory - A forward reference to the target constructor.
* @param transient - Whether an instance is constructed if none is linked.
* @typeParam K - The {@link Target}ed constructor type.
* @returns A prototype property decorator.
*
* @example
* **Factor** an eager and lazy service:
* ```ts
* import { Factor } from '@sgrud/core';
* import { EagerService, LazyService } from './services';
*
* export class ServiceHandler {
*
* @Factor(() => EagerService)
* private readonly service!: EagerService;
*
* @Factor(() => LazyService, true)
* private readonly service?: LazyService;
*
* }
* ```
*
* @see {@link Linker}
* @see {@link Target}
*/
export function Factor<K extends new () => any>(
targetFactory: () => K,
transient: boolean = false
) {
/**
* @param prototype - The `prototype` to be decorated.
* @param propertyKey - The `prototype` property to be decorated.
*/
return function(prototype: object, propertyKey: PropertyKey): void {
Object.defineProperty(prototype, propertyKey, {
enumerable: true,
get: (): InstanceType<K> | undefined => {
const linker = new Linker<K>();
if (transient && !linker.has(targetFactory())) {
return undefined;
}
return linker.get(targetFactory());
},
set: Function.prototype as (...args: any[]) => any
});
};
}
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