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