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import { isNull, argumentNotEmptyString, each, keys } from "../safe";
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import { ActivationContext } from "./ActivationContext";
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import { ServiceMap, Descriptor, PartialServiceMap } from "./interfaces";
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import { ActivationError } from "./ActivationError";
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export interface ReferenceDescriptorParams<S, K extends keyof S> {
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name: K;
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lazy?: boolean;
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optional?: boolean;
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default?: S[K];
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services?: PartialServiceMap<S>;
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}
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function defined<T>(v: T | undefined) {
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if (v === undefined)
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throw Error();
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return v;
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}
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export class ReferenceDescriptor<S = any, K extends keyof S = keyof S> implements Descriptor<S, S[K] | ((args?: PartialServiceMap<S> ) => S[K])> {
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_name: K;
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_lazy = false;
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_optional = false;
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_default: S[K] | undefined;
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_services: ServiceMap<S>;
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constructor(opts: ReferenceDescriptorParams<S, K>) {
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argumentNotEmptyString(opts && opts.name, "opts.name");
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this._name = opts.name;
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this._lazy = !!opts.lazy;
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this._optional = !!opts.optional;
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this._default = opts.default;
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this._services = (opts.services || {}) as ServiceMap<S>;
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}
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activate(context: ActivationContext<S>) {
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// добавляем сервисы
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if (this._services) {
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each(this._services, (v, k) => context.register(k, v));
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}
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if (this._lazy) {
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const saved = context.clone();
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return (cfg?: PartialServiceMap<S>) => {
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// защищаем контекст на случай исключения в процессе
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// активации
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const ct = saved.clone();
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try {
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if (cfg) {
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each(cfg as ServiceMap<S>, (v, k) => ct.register(k, v));
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}
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return this._optional ? ct.resolve(this._name, this._default) : ct
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.resolve(this._name);
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} catch (error) {
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throw new ActivationError(this._name.toString(), ct.getStack(), error);
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}
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};
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} else {
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const v = this._optional ?
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context.resolve(this._name, this._default) :
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context.resolve(this._name);
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return v;
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}
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}
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toString() {
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const opts = [];
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if (this._optional)
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opts.push("optional");
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if (this._lazy)
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opts.push("lazy");
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const parts = [
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"@ref "
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];
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if (opts.length) {
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parts.push("{");
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parts.push(opts.join());
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parts.push("} ");
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}
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parts.push(this._name.toString());
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if (this._default !== undefined && this._default !== null) {
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parts.push(" = ");
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parts.push(String(this._default));
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}
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return parts.join("");
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}
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}
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