ReferenceDescriptor.ts
88 lines
| 2.4 KiB
| video/mp2t
|
TypeScriptLexer
cin
|
r0 | import { argumentNotEmptyString, each } from "../safe"; | ||
| import { ActivationContext } from "./ActivationContext"; | ||||
| import { Descriptor, PartialServiceMap, TypeOfService, ContainerKeys } from "./interfaces"; | ||||
| export interface ReferenceDescriptorParams<S extends object, K extends ContainerKeys<S>> { | ||||
| /** | ||||
| * The name of the descriptor | ||||
| */ | ||||
| name: K; | ||||
| /** | ||||
| * The flag that indicates that the referenced service isn't required to exist. | ||||
| * If the reference is optional and the referenced service doesn't exist, | ||||
| * the undefined or a default value will be returned. | ||||
| */ | ||||
| optional?: boolean; | ||||
| /** | ||||
| * a default value for the reference when the referenced service doesn't exist. | ||||
| */ | ||||
| default?: TypeOfService<S, K>; | ||||
| /** | ||||
| * The service overrides | ||||
| */ | ||||
| services?: PartialServiceMap<S>; | ||||
| } | ||||
| export class ReferenceDescriptor<S extends object = any, K extends ContainerKeys<S> = ContainerKeys<S>> | ||||
| implements Descriptor<S, TypeOfService<S, K>> { | ||||
| _name: K; | ||||
| _optional = false; | ||||
| _default: TypeOfService<S, K> | undefined; | ||||
| _services: PartialServiceMap<S>; | ||||
| constructor(opts: ReferenceDescriptorParams<S, K>) { | ||||
| argumentNotEmptyString(opts && opts.name, "opts.name"); | ||||
| this._name = opts.name; | ||||
| this._optional = !!opts.optional; | ||||
| this._default = opts.default; | ||||
| this._services = (opts.services || {}) as PartialServiceMap<S>; | ||||
| } | ||||
| /** This method activates the referenced service if one exists | ||||
| * @param context activation context which is used during current activation | ||||
| */ | ||||
| activate(context: ActivationContext<S>): any { | ||||
| // добавляем сервисы | ||||
| if (this._services) { | ||||
| each(this._services, (v, k) => context.register(k, v)); | ||||
| } | ||||
| const res = this._optional ? | ||||
| context.resolve(this._name, this._default) : | ||||
| context.resolve(this._name); | ||||
| return res; | ||||
| } | ||||
| toString() { | ||||
| const opts = []; | ||||
| if (this._optional) | ||||
| opts.push("optional"); | ||||
| const parts = [ | ||||
| "@ref " | ||||
| ]; | ||||
| if (opts.length) { | ||||
| parts.push("{"); | ||||
| parts.push(opts.join()); | ||||
| parts.push("} "); | ||||
| } | ||||
| parts.push(this._name.toString()); | ||||
| if (this._default !== undefined && this._default !== null) { | ||||
| parts.push(" = "); | ||||
| parts.push(String(this._default)); | ||||
| } | ||||
| return parts.join(""); | ||||
| } | ||||
| } | ||||