ReferenceDescriptor.ts
99 lines
| 2.7 KiB
| video/mp2t
|
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r33 | import { isNull, argumentNotEmptyString, each } from "../safe"; | |
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r34 | import { ActivationContext } from "./ActivationContext"; | |
| import { ServiceMap, Descriptor } from "./interfaces"; | |||
| import { ActivationError } from "./ActivationError"; | |||
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r33 | ||
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r34 | export class ReferenceDescriptor implements Descriptor { | |
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r33 | _name: string | |
| _lazy = false | |||
| _optional = false | |||
| _default: any | |||
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r34 | _services: ServiceMap | |
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r33 | ||
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r34 | constructor(name: string, lazy: boolean, optional: boolean, def, services: ServiceMap) { | |
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r33 | argumentNotEmptyString(name, "name"); | |
| this._name = name; | |||
| this._lazy = Boolean(lazy); | |||
| this._optional = Boolean(optional); | |||
| this._default = def; | |||
| this._services = services; | |||
| } | |||
| activate(context: ActivationContext, name: string) { | |||
| var me = this; | |||
| context.enter(name, this, true); | |||
| // добавляем сервисы | |||
| if (me._services) { | |||
| for (var p in me._services) { | |||
| var sv = me._services[p]; | |||
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r34 | context.register(p, sv); | |
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r33 | } | |
| } | |||
| if (me._lazy) { | |||
| // сохраняем контекст активации | |||
| context = context.clone(); | |||
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r34 | return function (cfg: ServiceMap) { | |
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r33 | // защищаем контекст на случай исключения в процессе | |
| // активации | |||
| var ct = context.clone(); | |||
| try { | |||
| if (cfg) | |||
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r34 | for(let k in cfg) | |
| ct.register(k, cfg[v]); | |||
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r33 | return me._optional ? ct.getService(me._name, me._default) : ct | |
| .getService(me._name); | |||
| } catch (error) { | |||
| throw new ActivationError(me._name, ct.getStack(), error); | |||
| } | |||
| }; | |||
| } | |||
| var v = me._optional ? | |||
| context.getService(me._name, me._default) : | |||
| context.getService(me._name); | |||
| context.leave(); | |||
| return v; | |||
| } | |||
| isInstanceCreated() { | |||
| return false; | |||
| } | |||
| getInstance() { | |||
| throw new Error("The reference descriptor doesn't allowed to hold an instance"); | |||
| } | |||
| toString() { | |||
| var opts = []; | |||
| if (this._optional) | |||
| opts.push("optional"); | |||
| if (this._lazy) | |||
| opts.push("lazy"); | |||
| var parts = [ | |||
| "@ref " | |||
| ]; | |||
| if (opts.length) { | |||
| parts.push("{"); | |||
| parts.push(opts.join()); | |||
| parts.push("} "); | |||
| } | |||
| parts.push(this._name); | |||
| if (!isNull(this._default)) { | |||
| parts.push(" = "); | |||
| parts.push(this._default); | |||
| } | |||
| return parts.join(""); | |||
| } | |||
| } |