2016-04-28 20:50:03 -04:00
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import {resolveForwardRef, Injectable, PipeMetadata, reflector} from '@angular/core';
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2016-05-02 01:50:37 -04:00
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import {ReflectorReader} from '../core_private';
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2016-04-28 20:50:03 -04:00
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import {Type, isPresent, stringify} from '../src/facade/lang';
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import {BaseException} from '../src/facade/exceptions';
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2015-08-07 14:41:38 -04:00
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2015-10-23 02:35:53 -04:00
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function _isPipeMetadata(type: any): boolean {
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return type instanceof PipeMetadata;
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}
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2015-08-07 14:41:38 -04:00
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/**
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2015-08-14 13:03:45 -04:00
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* Resolve a `Type` for {@link PipeMetadata}.
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2015-08-07 14:41:38 -04:00
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*
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* This interface can be overridden by the application developer to create custom behavior.
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*
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* See {@link Compiler}
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*/
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@Injectable()
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export class PipeResolver {
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2016-03-24 16:32:47 -04:00
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private _reflector: ReflectorReader;
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constructor(_reflector?: ReflectorReader) {
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if (isPresent(_reflector)) {
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this._reflector = _reflector;
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} else {
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this._reflector = reflector;
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}
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}
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2015-08-07 14:41:38 -04:00
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/**
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2015-08-14 13:03:45 -04:00
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* Return {@link PipeMetadata} for a given `Type`.
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2015-08-07 14:41:38 -04:00
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*/
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2015-08-14 13:03:45 -04:00
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resolve(type: Type): PipeMetadata {
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2016-03-24 16:32:47 -04:00
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var metas = this._reflector.annotations(resolveForwardRef(type));
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2015-08-07 14:41:38 -04:00
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if (isPresent(metas)) {
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2015-10-09 12:07:58 -04:00
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var annotation = metas.find(_isPipeMetadata);
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2015-10-23 02:35:53 -04:00
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if (isPresent(annotation)) {
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return annotation;
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2015-08-07 14:41:38 -04:00
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}
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}
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throw new BaseException(`No Pipe decorator found on ${stringify(type)}`);
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}
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}
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2015-12-02 13:35:51 -05:00
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2016-03-24 16:32:47 -04:00
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export var CODEGEN_PIPE_RESOLVER = new PipeResolver(reflector);
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