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49 lines
1.2 KiB
49 lines
1.2 KiB
import { Factory } from './Factory'
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import { Collection } from '../../util'
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import {DependencyKey, DependencyRequirement, PropertyDependency} from '../types'
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/**
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* Container factory which returns its token as its value, without attempting
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* to instantiate anything. This is used to register already-produced-singletons
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* with the container.
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*
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* @example
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* ```typescript
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* class A {}
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* const exactlyThisInstanceOfA = new A()
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*
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* const fact = new SingletonFactory(A, a)
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*
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* fact.produce([], []) // => exactlyThisInstanceOfA
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* ```
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*
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* @extends Factory
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*/
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export default class SingletonFactory<T> extends Factory<T> {
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constructor(
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/**
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* Token identifying this singleton.
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*/
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protected token: DependencyKey,
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/**
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* The value of this singleton.
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*/
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protected value: T,
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) {
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super(token)
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}
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produce(): T {
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return this.value
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}
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getDependencyKeys(): Collection<DependencyRequirement> {
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return new Collection<DependencyRequirement>()
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}
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getInjectedProperties(): Collection<PropertyDependency> {
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return new Collection<PropertyDependency>()
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}
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}
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