@angular/core
Version:
Angular - the core framework
34 lines • 4.87 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { convertToBitFlags } from '../di/injector_compatibility';
import { NOT_FOUND_CHECK_ONLY_ELEMENT_INJECTOR } from '../view/provider_flags';
/**
* Injector that looks up a value using a specific injector, before falling back to the module
* injector. Used primarily when creating components or embedded views dynamically.
*/
export class ChainedInjector {
constructor(injector, parentInjector) {
this.injector = injector;
this.parentInjector = parentInjector;
}
get(token, notFoundValue, flags) {
flags = convertToBitFlags(flags);
const value = this.injector.get(token, NOT_FOUND_CHECK_ONLY_ELEMENT_INJECTOR, flags);
if (value !== NOT_FOUND_CHECK_ONLY_ELEMENT_INJECTOR ||
notFoundValue === NOT_FOUND_CHECK_ONLY_ELEMENT_INJECTOR) {
// Return the value from the root element injector when
// - it provides it
// (value !== NOT_FOUND_CHECK_ONLY_ELEMENT_INJECTOR)
// - the module injector should not be checked
// (notFoundValue === NOT_FOUND_CHECK_ONLY_ELEMENT_INJECTOR)
return value;
}
return this.parentInjector.get(token, notFoundValue, flags);
}
}
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