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import { argumentNotEmptyString, each } from "../safe";
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import { ActivationContext } from "./ActivationContext";
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import { Descriptor, PartialServiceMap, TypeOfService, ContainerKeys } from "./interfaces";
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export interface ReferenceDescriptorParams<S extends object, K extends ContainerKeys<S>> {
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/**
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* The name of the descriptor
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*/
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name: K;
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/**
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* The flag that indicates that the referenced service isn't required to exist.
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* If the reference is optional and the referenced service doesn't exist,
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* the undefined or a default value will be returned.
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*/
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optional?: boolean;
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/**
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* a default value for the reference when the referenced service doesn't exist.
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*/
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default?: TypeOfService<S, K>;
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/**
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* The service overrides
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*/
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services?: PartialServiceMap<S>;
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}
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export class ReferenceDescriptor<S extends object = any, K extends ContainerKeys<S> = ContainerKeys<S>>
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implements Descriptor<S, TypeOfService<S, K>> {
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_name: K;
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_optional = false;
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_default: TypeOfService<S, K> | undefined;
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_services: PartialServiceMap<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._optional = !!opts.optional;
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this._default = opts.default;
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this._services = (opts.services || {}) as PartialServiceMap<S>;
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}
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/** This method activates the referenced service if one exists
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* @param context activation context which is used during current activation
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*/
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activate(context: ActivationContext<S>): any {
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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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const res = 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 res;
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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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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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