40 lines
1.1 KiB
TypeScript
40 lines
1.1 KiB
TypeScript
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Injectable, NgModuleMetadata} from '@angular/core';
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import {ReflectorReader, reflector} from '../core_private';
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import {BaseException} from '../src/facade/exceptions';
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import {Type, isBlank, isPresent, stringify} from '../src/facade/lang';
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function _isNgModuleMetadata(obj: any): obj is NgModuleMetadata {
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return obj instanceof NgModuleMetadata;
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}
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/**
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* Resolves types to {@link NgModuleMetadata}.
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*/
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@Injectable()
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export class NgModuleResolver {
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constructor(private _reflector: ReflectorReader = reflector) {}
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resolve(type: Type, throwIfNotFound = true): NgModuleMetadata {
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const ngModuleMeta: NgModuleMetadata =
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this._reflector.annotations(type).find(_isNgModuleMetadata);
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if (isPresent(ngModuleMeta)) {
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return ngModuleMeta;
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} else {
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if (throwIfNotFound) {
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throw new BaseException(`No NgModule metadata found for '${stringify(type)}'.`);
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}
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return null;
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}
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}
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}
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