import Factory from './Factory.ts'
import {Collection} from '../../../lib/src/collection/Collection.ts'
import {DependencyRequirement} from '../type/DependencyRequirement.ts'

/**
 * Container factory which returns its token as its value, without attempting
 * to instantiate anything. This is used to register already-produced-singletons
 * with the container.
 * @extends Factory
 */
export default class SingletonFactory extends Factory {
    constructor(
        /**
         * Instantiated value of this factory.
         * @type FunctionConstructor
         */
        protected token: FunctionConstructor,

        /**
         * String name of this singleton identifying it in the container.
         * @type string
         */
        protected key: string,
    ) {
        super(token)
    }

    produce(dependencies: any[], parameters: any[]) {
        return this.token
    }

    match(something: any) {
        return something === this.key
    }

    get_dependency_keys(): Collection<DependencyRequirement> {
        return new Collection<DependencyRequirement>()
    }
}