angular-docs-cn/modules/@angular/compiler/testing/pipe_resolver_mock.ts

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/**
* @license
* Copyright Google Inc. 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 {PipeResolver} from '@angular/compiler';
import {Compiler, Injectable, Injector, Pipe, Type} from '@angular/core';
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@Injectable()
export class MockPipeResolver extends PipeResolver {
private _pipes = new Map<Type<any>, Pipe>();
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constructor(private _injector: Injector) { super(); }
private get _compiler(): Compiler { return this._injector.get(Compiler); }
private _clearCacheFor(pipe: Type<any>) { this._compiler.clearCacheFor(pipe); }
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/**
* Overrides the {@link Pipe} for a pipe.
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*/
setPipe(type: Type<any>, metadata: Pipe): void {
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this._pipes.set(type, metadata);
this._clearCacheFor(type);
}
/**
* Returns the {@link Pipe} for a pipe:
* - Set the {@link Pipe} to the overridden view when it exists or fallback to the
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* default
* `PipeResolver`, see `setPipe`.
*/
resolve(type: Type<any>, throwIfNotFound = true): Pipe {
let metadata = this._pipes.get(type);
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if (!metadata) {
metadata = super.resolve(type, throwIfNotFound);
}
return metadata;
}
}