ReferenceDescriptor.ts
101 lines
| 2.8 KiB
| video/mp2t
|
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r49 | import { isNull, argumentNotEmptyString, each } from "../safe"; | ||
| import { ActivationContext } from "./ActivationContext"; | ||||
| import { ServiceMap, Descriptor } from "./interfaces"; | ||||
| import { ActivationError } from "./ActivationError"; | ||||
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r113 | export interface ReferenceDescriptorParams<S, K extends keyof S> { | ||
| name: K; | ||||
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r49 | lazy?: boolean; | ||
| optional?: boolean; | ||||
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r113 | default?: S[K]; | ||
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r49 | services?: ServiceMap; | ||
| } | ||||
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r113 | export class ReferenceDescriptor<S, K extends keyof S> implements Descriptor<S[K]> { | ||
| _name: K; | ||||
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r49 | |||
| _lazy = false; | ||||
| _optional = false; | ||||
| _default: any; | ||||
| _services: ServiceMap; | ||||
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r113 | constructor(opts: ReferenceDescriptorParams<S, K>) { | ||
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r49 | argumentNotEmptyString(opts && opts.name, "opts.name"); | ||
| this._name = opts.name; | ||||
| this._lazy = !!opts.lazy; | ||||
| this._optional = !!opts.optional; | ||||
| this._default = opts.default; | ||||
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r113 | |||
| this._services = opts.services || {}; | ||||
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r49 | } | ||
| activate(context: ActivationContext, name: string) { | ||||
| // добавляем сервисы | ||||
| if (this._services) { | ||||
| for (const p of Object.keys(this._services)) | ||||
| context.register(p, this._services[p]); | ||||
| } | ||||
| if (this._lazy) { | ||||
| const saved = context.clone(); | ||||
| return (cfg: ServiceMap) => { | ||||
| // защищаем контекст на случай исключения в процессе | ||||
| // активации | ||||
| const ct = saved.clone(); | ||||
| try { | ||||
| if (cfg) { | ||||
| for (const k in cfg) | ||||
| ct.register(k, cfg[k]); | ||||
| } | ||||
| return this._optional ? ct.resolve(this._name, this._default) : ct | ||||
| .resolve(this._name); | ||||
| } catch (error) { | ||||
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r113 | throw new ActivationError(this._name.toString(), ct.getStack(), error); | ||
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r49 | } | ||
| }; | ||||
| } else { | ||||
| // добавляем сервисы | ||||
| if (this._services) { | ||||
| for (const p of Object.keys(this._services)) | ||||
| context.register(p, this._services[p]); | ||||
| } | ||||
| const v = this._optional ? | ||||
| context.resolve(this._name, this._default) : | ||||
| context.resolve(this._name); | ||||
| return v; | ||||
| } | ||||
| } | ||||
| toString() { | ||||
| const opts = []; | ||||
| if (this._optional) | ||||
| opts.push("optional"); | ||||
| if (this._lazy) | ||||
| opts.push("lazy"); | ||||
| const parts = [ | ||||
| "@ref " | ||||
| ]; | ||||
| if (opts.length) { | ||||
| parts.push("{"); | ||||
| parts.push(opts.join()); | ||||
| parts.push("} "); | ||||
| } | ||||
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r113 | parts.push(this._name.toString()); | ||
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r49 | |||
| if (!isNull(this._default)) { | ||||
| parts.push(" = "); | ||||
| parts.push(this._default); | ||||
| } | ||||
| return parts.join(""); | ||||
| } | ||||
| } | ||||