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import { Descriptor, ILifetime, DepsMap, IActivationContext, DescriptorMap } from "./interfaces";
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import { each, key } from "./traits";
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export interface DescriptorImplArgs<S, T> {
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lifetime: ILifetime<T>;
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factory: (refs: Record<key, unknown>) => NonNullable<T>;
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cleanup?: (item: NonNullable<T>) => void;
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overrides?: DescriptorMap<S>;
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dependencies?: DepsMap<S>;
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}
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export class DescriptorImpl<S, T> implements Descriptor<S, T> {
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private readonly _overrides?: DescriptorMap<S>;
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private readonly _lifetime: ILifetime<T>;
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private readonly _factory: (refs: Record<key, unknown>) => NonNullable<T>;
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private readonly _cleanup?: (item: NonNullable<T>) => void;
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private readonly _deps?: DepsMap<S>;
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readonly hasOverrides: boolean;
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constructor({ lifetime, factory, cleanup, overrides, dependencies }: DescriptorImplArgs<S, T>) {
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this._lifetime = lifetime;
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this._factory = factory;
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if (cleanup)
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this._cleanup = cleanup;
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if (overrides)
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this._overrides = overrides;
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if (dependencies)
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this._deps = dependencies;
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this.hasOverrides = !!overrides;
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}
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activate(context: IActivationContext<S>): NonNullable<T> {
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const { has, get, initialize, store } = this._lifetime(context);
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if (has())
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return get();
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initialize();
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if (this._overrides)
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each(this._overrides, (v, k) => context.register(k, v));
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const resolve = <K extends keyof S>({ name, lazy, ...opts }: { name: K; lazy?: boolean; default?: S[K] | null; }) => {
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if (lazy) {
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return "default" in opts ?
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() => context.resolve(name, opts.default) :
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() => context.resolve(name);
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} else {
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return "default" in opts ?
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context.resolve(name, opts.default) :
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context.resolve(name);
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}
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};
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const deps = this._deps;
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const refs = deps ?
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Object.keys(deps)
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.map(k => {
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const ref = deps[k];
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return typeof ref !== "object" ?
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{ [k]: resolve({ name: ref }) } :
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{ [k]: resolve(ref) };
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})
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.reduce((a, p) => ({ ...a, ...p }), {}) :
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{};
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try {
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// call the factory method
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const instance = (0,this._factory)(refs);
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// store the instance
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store(instance, this._cleanup);
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return instance;
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} catch(err) {
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context.fail(err);
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}
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}
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toString() {
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return `[object DescriptorImpl, lifetime=${String(this._lifetime)}]`;
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}
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}
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