refactor(pipes): use angular lifecycle hooks instead of PipeOnDestroy

BREAKING CHANGE:
Previously, pipes that wanted to be notified when they were destroyed
would implement the PipeOnDestroy interface and name the callback
`onDestroy`. This change removes the PipeOnDestroy interface and
instead uses Angular's lifecycle interface `OnDestroy`, with the
`ngOnDestroy` method.

Before:
```
import {Pipe, PipeOnDestroy} from 'angular2/angular2';
@Pipe({pure: false})
export class MyPipe implements PipeOnDestroy {
  onDestroy() {}
}
```

After:
import {Pipe, OnDestroy} from 'angular2/angular2';
@Pipe({pure: false})
export class MyPipe implements PipeOnDestroy {
  ngOnDestroy() {}
}

modules/angular2/src/common/pipes/async_pipe.ts

@@ -4,7 +4,7 @@ import {
   Pipe,
   Injectable,
   ChangeDetectorRef,
-  PipeOnDestroy,
+  OnDestroy,
   PipeTransform,
   WrappedValue
 } from 'angular2/core';
@@ -55,7 +55,7 @@ var _observableStrategy = new ObservableStrategy();
  */
 @Pipe({name: 'async', pure: false})
 @Injectable()
-export class AsyncPipe implements PipeTransform, PipeOnDestroy {
+export class AsyncPipe implements PipeTransform, OnDestroy {
   /** @internal */
   _latestValue: Object = null;
   /** @internal */
@@ -70,7 +70,7 @@ export class AsyncPipe implements PipeTransform, PipeOnDestroy {
   public _ref: ChangeDetectorRef;
   constructor(_ref: ChangeDetectorRef) { this._ref = _ref; }
 
-  onDestroy(): void {
+  ngOnDestroy(): void {
     if (isPresent(this._subscription)) {
       this._dispose();
     }

modules/angular2/src/core/change_detection.ts

@@ -15,7 +15,6 @@ export {
   WrappedValue,
   SimpleChange,
   PipeTransform,
-  PipeOnDestroy,
   IterableDiffers,
   IterableDiffer,
   IterableDifferFactory,

modules/angular2/src/core/change_detection/change_detection.ts

@@ -39,7 +39,7 @@ export {DynamicChangeDetector} from './dynamic_change_detector';
 export {ChangeDetectorRef} from './change_detector_ref';
 export {IterableDiffers, IterableDiffer, IterableDifferFactory} from './differs/iterable_differs';
 export {KeyValueDiffers, KeyValueDiffer, KeyValueDifferFactory} from './differs/keyvalue_differs';
-export {PipeTransform, PipeOnDestroy} from './pipe_transform';
+export {PipeTransform} from './pipe_transform';
 export {WrappedValue, SimpleChange} from './change_detection_util';
 
 /**

modules/angular2/src/core/change_detection/change_detection_util.ts

@@ -195,7 +195,7 @@ export class ChangeDetectionUtil {
 
   static callPipeOnDestroy(selectedPipe: SelectedPipe): void {
     if (implementsOnDestroy(selectedPipe.pipe)) {
-      (<any>selectedPipe.pipe).onDestroy();
+      (<any>selectedPipe.pipe).ngOnDestroy();
     }
   }
 

modules/angular2/src/core/change_detection/pipe_lifecycle_reflector.dart

@@ -1,5 +1,5 @@
 library angular2.core.compiler.pipe_lifecycle_reflector;
 
-import 'package:angular2/src/core/change_detection/pipe_transform.dart';
+import 'package:angular2/src/core/linker/interfaces.dart';
 
-bool implementsOnDestroy(Object pipe) => pipe is PipeOnDestroy;
+bool implementsOnDestroy(Object pipe) => pipe is OnDestroy;

modules/angular2/src/core/change_detection/pipe_lifecycle_reflector.ts

@@ -1,3 +1,3 @@
 export function implementsOnDestroy(pipe: any): boolean {
-  return pipe.constructor.prototype.onDestroy;
+  return pipe.constructor.prototype.ngOnDestroy;
 }

modules/angular2/src/core/change_detection/pipe_transform.ts

@@ -31,55 +31,3 @@
  *
  */
 export interface PipeTransform { transform(value: any, args: any[]): any; }
-
-/**
- * To create a stateful Pipe, you should implement this interface and set the `pure`
- * parameter to `false` in the {@link PipeMetadata}.
- *
- * A stateful pipe may produce different output, given the same input. It is
- * likely that a stateful pipe may contain state that should be cleaned up when
- * a binding is destroyed. For example, a subscription to a stream of data may need to
- * be disposed, or an interval may need to be cleared.
- *
- * ### Example ([live demo](http://plnkr.co/edit/i8pm5brO4sPaLxBx56MR?p=preview))
- *
- * In this example, a pipe is created to countdown its input value, updating it every
- * 50ms. Because it maintains an internal interval, it automatically clears
- * the interval when the binding is destroyed or the countdown completes.
- *
- * ```
- * import {Pipe, PipeTransform} from 'angular2/angular2'
- * @Pipe({name: 'countdown', pure: false})
- * class CountDown implements PipeTransform, PipeOnDestroy {
- *   remainingTime:Number;
- *   interval:SetInterval;
- *   onDestroy() {
- *     if (this.interval) {
- *       clearInterval(this.interval);
- *     }
- *   }
- *   transform(value: any, args: any[] = []) {
- *     if (!parseInt(value, 10)) return null;
- *     if (typeof this.remainingTime !== 'number') {
- *       this.remainingTime = parseInt(value, 10);
- *     }
- *     if (!this.interval) {
- *       this.interval = setInterval(() => {
- *         this.remainingTime-=50;
- *         if (this.remainingTime <= 0) {
- *           this.remainingTime = 0;
- *           clearInterval(this.interval);
- *           delete this.interval;
- *         }
- *       }, 50);
- *     }
- *     return this.remainingTime;
- *   }
- * }
- * ```
- *
- * Invoking `{{ 10000 | countdown }}` would cause the value to be decremented by 50,
- * every 50ms, until it reaches 0.
- *
- */
-export interface PipeOnDestroy { onDestroy(): void; }

modules/angular2/src/core/linker/interfaces.ts

@@ -226,6 +226,56 @@ export interface DoCheck { ngDoCheck(); }
  *
  * bootstrap(App).catch(err => console.error(err));
  * ```
+ *
+ *
+ * To create a stateful Pipe, you should implement this interface and set the `pure`
+ * parameter to `false` in the {@link PipeMetadata}.
+ *
+ * A stateful pipe may produce different output, given the same input. It is
+ * likely that a stateful pipe may contain state that should be cleaned up when
+ * a binding is destroyed. For example, a subscription to a stream of data may need to
+ * be disposed, or an interval may need to be cleared.
+ *
+ * ### Example ([live demo](http://plnkr.co/edit/i8pm5brO4sPaLxBx56MR?p=preview))
+ *
+ * In this example, a pipe is created to countdown its input value, updating it every
+ * 50ms. Because it maintains an internal interval, it automatically clears
+ * the interval when the binding is destroyed or the countdown completes.
+ *
+ * ```
+ * import {OnDestroy, Pipe, PipeTransform} from 'angular2/angular2'
+ * @Pipe({name: 'countdown', pure: false})
+ * class CountDown implements PipeTransform, OnDestroy {
+ *   remainingTime:Number;
+ *   interval:SetInterval;
+ *   ngOnDestroy() {
+ *     if (this.interval) {
+ *       clearInterval(this.interval);
+ *     }
+ *   }
+ *   transform(value: any, args: any[] = []) {
+ *     if (!parseInt(value, 10)) return null;
+ *     if (typeof this.remainingTime !== 'number') {
+ *       this.remainingTime = parseInt(value, 10);
+ *     }
+ *     if (!this.interval) {
+ *       this.interval = setInterval(() => {
+ *         this.remainingTime-=50;
+ *         if (this.remainingTime <= 0) {
+ *           this.remainingTime = 0;
+ *           clearInterval(this.interval);
+ *           delete this.interval;
+ *         }
+ *       }, 50);
+ *     }
+ *     return this.remainingTime;
+ *   }
+ * }
+ * ```
+ *
+ * Invoking `{{ 10000 | countdown }}` would cause the value to be decremented by 50,
+ * every 50ms, until it reaches 0.
+ *
  */
 export interface OnDestroy { ngOnDestroy(); }
 

modules/angular2/test/common/pipes/async_pipe_spec.ts

@@ -96,13 +96,13 @@ export function main() {
            }));
       });
 
-      describe("onDestroy", () => {
+      describe("ngOnDestroy", () => {
         it("should do nothing when no subscription",
-           () => { expect(() => pipe.onDestroy()).not.toThrow(); });
+           () => { expect(() => pipe.ngOnDestroy()).not.toThrow(); });
 
         it("should dispose of the existing subscription", inject([AsyncTestCompleter], (async) => {
              pipe.transform(emitter);
-             pipe.onDestroy();
+             pipe.ngOnDestroy();
 
              ObservableWrapper.callEmit(emitter, message);
 
@@ -182,9 +182,9 @@ export function main() {
              }, timer)
            }));
 
-        describe("onDestroy", () => {
+        describe("ngOnDestroy", () => {
           it("should do nothing when no source",
-             () => { expect(() => pipe.onDestroy()).not.toThrow(); });
+             () => { expect(() => pipe.ngOnDestroy()).not.toThrow(); });
 
           it("should dispose of the existing source", inject([AsyncTestCompleter], (async) => {
                pipe.transform(completer.promise);
@@ -194,7 +194,7 @@ export function main() {
 
                    TimerWrapper.setTimeout(() => {
                      expect(pipe.transform(completer.promise)).toEqual(new WrappedValue(message));
-                     pipe.onDestroy();
+                     pipe.ngOnDestroy();
                      expect(pipe.transform(completer.promise)).toBe(null);
                      async.done();
                    }, timer);

modules/angular2/test/common/pipes/pipes_spec.ts

@@ -10,20 +10,20 @@ import {
   afterEach
 } from 'angular2/testing_internal';
 
-import {Injector, Inject, provide, Pipe, PipeTransform} from 'angular2/core';
+import {Injector, Inject, provide, Pipe, PipeTransform, OnDestroy} from 'angular2/core';
 import {ProtoPipes, Pipes} from 'angular2/src/core/pipes/pipes';
 import {PipeProvider} from 'angular2/src/core/pipes/pipe_provider';
 
-class PipeA implements PipeTransform {
+class PipeA implements PipeTransform, OnDestroy {
   transform(a, b) {}
-  onDestroy() {}
+  ngOnDestroy() {}
 }
 
-class PipeB implements PipeTransform {
+class PipeB implements PipeTransform, OnDestroy {
   dep;
   constructor(@Inject("dep") dep: any) { this.dep = dep; }
   transform(a, b) {}
-  onDestroy() {}
+  ngOnDestroy() {}
 }
 
 export function main() {

modules/angular2/test/core/change_detection/change_detector_spec.ts

@@ -35,7 +35,6 @@ import {
   DirectiveRecord,
   DirectiveIndex,
   PipeTransform,
-  PipeOnDestroy,
   ChangeDetectionStrategy,
   WrappedValue,
   DynamicProtoChangeDetector,
@@ -48,6 +47,7 @@ import {
 
 import {SelectedPipe, Pipes} from 'angular2/src/core/change_detection/pipes';
 import {JitProtoChangeDetector} from 'angular2/src/core/change_detection/jit_proto_change_detector';
+import {OnDestroy} from 'angular2/src/core/linker/interfaces';
 
 import {getDefinition} from './change_detector_config';
 import {createObservableModel} from './change_detector_spec_util';
@@ -1228,7 +1228,7 @@ export function main() {
           expect(cd.hydrated()).toBe(true);
         });
 
-        it('should destroy all active pipes implementing onDestroy during dehyration', () => {
+        it('should destroy all active pipes implementing ngOnDestroy during dehyration', () => {
           var pipe = new PipeWithOnDestroy();
           var registry = new FakePipes('pipe', () => pipe);
           var cd = _createChangeDetector('name | pipe', new Person('bob'), registry).changeDetector;
@@ -1239,7 +1239,7 @@ export function main() {
           expect(pipe.destroyCalled).toBe(true);
         });
 
-        it('should not call onDestroy all pipes that do not implement onDestroy', () => {
+        it('should not call ngOnDestroy all pipes that do not implement ngOnDestroy', () => {
           var pipe = new CountingPipe();
           var registry = new FakePipes('pipe', () => pipe);
           var cd = _createChangeDetector('name | pipe', new Person('bob'), registry).changeDetector;
@@ -1365,9 +1365,9 @@ class CountingPipe implements PipeTransform {
   transform(value, args = null) { return `${value} state:${this.state ++}`; }
 }
 
-class PipeWithOnDestroy implements PipeTransform, PipeOnDestroy {
+class PipeWithOnDestroy implements PipeTransform, OnDestroy {
   destroyCalled: boolean = false;
-  onDestroy() { this.destroyCalled = true; }
+  ngOnDestroy() { this.destroyCalled = true; }
 
   transform(value, args = null) { return null; }
 }

modules/angular2/test/core/linker/integration_spec.ts

@@ -54,7 +54,8 @@ import {
   Inject,
   Host,
   SkipSelf,
-  SkipSelfMetadata
+  SkipSelfMetadata,
+  OnDestroy
 } from 'angular2/core';
 
 import {NgIf, NgFor} from 'angular2/common';
@@ -1999,8 +2000,8 @@ class SomeViewport {
 }
 
 @Pipe({name: 'double'})
-class DoublePipe implements PipeTransform {
+class DoublePipe implements PipeTransform, OnDestroy {
-  onDestroy() {}
+  ngOnDestroy() {}
   transform(value, args = null) { return `${value}${value}`; }
 }
 

modules/angular2/test/public_api_spec.ts

@@ -108,7 +108,7 @@ var NG_ALL = [
   'ApplicationRef.tick()',
   */
   'AsyncPipe',
-  'AsyncPipe.onDestroy()',
+  'AsyncPipe.ngOnDestroy()',
   'AsyncPipe.transform()',
   'Attribute',
   'Attribute.attributeName',
@@ -1425,7 +1425,6 @@ var NG_ALL = [
   'OnChanges:dart',
   'OnDestroy:dart',
   'OnInit:dart',
-  'PipeOnDestroy:dart',
   'PipeTransform:dart',
   'reflector',
   'RenderBeginCmd:dart',