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import { Container } from "./Container";
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import { DescriptorBuilder } from "./DescriptorBuilder";
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import { Descriptor, IContainerBuilder, IDescriptorBuilder, DescriptorMap, ServiceLocator, ILifetimeManager } from "../typings/interfaces";
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/**
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* Container builder used to prepare service descriptors and create a IoC container
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*/
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export class ContainerBuilder<S, U extends keyof S> implements
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IContainerBuilder<S, U> {
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private _pending = 1;
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private readonly _services: DescriptorMap<S>;
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private readonly _scope: ILifetimeManager[];
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private readonly _level: number;
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constructor(parentServices: DescriptorMap<S> | null, scope: ILifetimeManager[] = []) {
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this._services = { ...parentServices }; // create a copy
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this._level = scope.length;
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this._scope = scope;
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}
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createServiceBuilder<K extends U>(name: K): IDescriptorBuilder<S, S[K], Record<never, never>, U> {
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return new DescriptorBuilder(this._level, String(name), this._register(name), this._fail);
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}
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build(): ServiceLocator<S> {
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this._assertBuilding();
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if (!this._complete())
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throw new Error("The configuration didn't complete.");
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return new Container(this._services, this._scope);
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}
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private readonly _register = <K extends U>(name: K) =>
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(descriptor: Descriptor<S, S[K]>) => {
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this._complete();
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this._services[name] = descriptor;
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};
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private readonly _fail = (ex: unknown) => {
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throw ex;
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};
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private _assertBuilding() {
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if (!this._pending)
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throw new Error("The descriptor builder is finalized");
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}
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private _complete() {
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return !(--this._pending);
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}
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}
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