839edaa15b
BREAKING CHANGE: Before: Angular called onDestroy on all pipes. After: Angular calls onDestroy only on pipes that have the onDestroy method.
63 lines
1.2 KiB
TypeScript
63 lines
1.2 KiB
TypeScript
import {ABSTRACT, BaseException, CONST, Type} from 'angular2/src/facade/lang';
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/**
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* An interface which all pipes must implement.
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*
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* #Example
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*
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* ```
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* class DoublePipe implements PipeTransform {
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* transform(value, args = []) {
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* return `${value}${value}`;
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* }
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* }
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* ```
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*/
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export interface PipeTransform { transform(value: any, args: List<any>): any; }
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/**
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* An interface that stateful pipes should implement.
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*
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* #Example
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*
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* ```
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* class StatefulPipe implements PipeTransform, PipeOnDestroy {
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* connection;
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*
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* onDestroy() {
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* this.connection.release();
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* }
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*
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* transform(value, args = []) {
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* this.connection = createConnection();
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* // ...
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* return someValue;
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* }
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* }
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* ```
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*/
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export interface PipeOnDestroy { onDestroy(): void; }
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/**
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* Provides default implementation of the `onDestroy` method.
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*
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* #Example
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*
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* ```
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* class DoublePipe extends BasePipe {
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* transform(value) {
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* return `${value}${value}`;
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* }
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* }
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* ```
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*/
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@CONST()
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export class BasePipeTransform implements PipeTransform, PipeOnDestroy {
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onDestroy(): void {}
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transform(value: any, args: List<any>): any { return _abstract(); }
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}
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function _abstract() {
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throw new BaseException('This method is abstract');
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}
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