refactor(ApplicationRef): Move ApplicationRef to its own file

Closes #3763

modules/angular2/src/core/application.dart

@@ -6,8 +6,9 @@ import 'package:angular2/src/reflection/reflection.dart' show reflector;
 import 'package:angular2/src/reflection/reflection_capabilities.dart'
     show ReflectionCapabilities;
 import 'application_common.dart';
+import 'application_ref.dart';
 
-export 'application_common.dart' show ApplicationRef;
+export 'application_ref.dart' show ApplicationRef;
 
 /// Starts an application from a root component. This implementation uses
 /// mirrors. Angular 2 transformer automatically replaces this method with a

modules/angular2/src/core/application.ts

@@ -1 +1,2 @@
-export {ApplicationRef, commonBootstrap as bootstrap} from './application_common';
+export {commonBootstrap as bootstrap} from './application_common';
+export {ApplicationRef} from './application_ref';

modules/angular2/src/core/application_common.ts

@@ -76,6 +76,7 @@ import {internalView} from 'angular2/src/core/compiler/view_ref';
 import {APP_COMPONENT_REF_PROMISE, APP_COMPONENT} from './application_tokens';
 import {wtfInit} from '../profile/wtf_init';
 import {EXCEPTION_BINDING} from './platform_bindings';
+import {ApplicationRef} from './application_ref';
 
 var _rootInjector: Injector;
 
@@ -337,51 +338,6 @@ export function commonBootstrap(
   return bootstrapProcess.promise;
 }
 
-/**
- * Represents a Angular's representation of an Application.
- *
- * `ApplicationRef` represents a running application instance. Use it to retrieve the host
- * component, injector,
- * or dispose of an application.
- */
-export class ApplicationRef {
-  _hostComponent: ComponentRef;
-  _injector: Injector;
-  _hostComponentType: Type;
-
-  /**
-   * @private
-   */
-  constructor(hostComponent: ComponentRef, hostComponentType: Type, injector: Injector) {
-    this._hostComponent = hostComponent;
-    this._injector = injector;
-    this._hostComponentType = hostComponentType;
-  }
-
-  /**
-   * Returns the current {@link ComponentMetadata} type.
-   */
-  get hostComponentType(): Type { return this._hostComponentType; }
-
-  /**
-   * Returns the current {@link ComponentMetadata} instance.
-   */
-  get hostComponent(): any { return this._hostComponent.instance; }
-
-  /**
-   * Dispose (un-load) the application.
-   */
-  dispose(): void {
-    // TODO: We also need to clean up the Zone, ... here!
-    this._hostComponent.dispose();
-  }
-
-  /**
-   * Returns the root application {@link Injector}.
-   */
-  get injector(): Injector { return this._injector; }
-}
-
 function _createAppInjector(appComponentType: Type, bindings: List<Type | Binding | List<any>>,
                             zone: NgZone): Injector {
   if (isBlank(_rootInjector)) _rootInjector = Injector.resolveAndCreate(_rootBindings);

modules/angular2/src/core/application_ref.ts

@@ -0,0 +1,47 @@
+import {ComponentRef} from 'angular2/src/core/compiler/dynamic_component_loader';
+import {Injector} from 'angular2/di';
+import {Type} from 'angular2/src/facade/lang';
+/**
+ * Represents a Angular's representation of an Application.
+ *
+ * `ApplicationRef` represents a running application instance. Use it to retrieve the host
+ * component, injector,
+ * or dispose of an application.
+ */
+export class ApplicationRef {
+  _hostComponent: ComponentRef;
+  _injector: Injector;
+  _hostComponentType: Type;
+
+  /**
+   * @private
+   */
+  constructor(hostComponent: ComponentRef, hostComponentType: Type, injector: Injector) {
+    this._hostComponent = hostComponent;
+    this._injector = injector;
+    this._hostComponentType = hostComponentType;
+  }
+
+  /**
+   * Returns the current {@link ComponentMetadata} type.
+   */
+  get hostComponentType(): Type { return this._hostComponentType; }
+
+  /**
+   * Returns the current {@link ComponentMetadata} instance.
+   */
+  get hostComponent(): any { return this._hostComponent.instance; }
+
+  /**
+   * Dispose (un-load) the application.
+   */
+  dispose(): void {
+    // TODO: We also need to clean up the Zone, ... here!
+    this._hostComponent.dispose();
+  }
+
+  /**
+   * Returns the root application {@link Injector}.
+   */
+  get injector(): Injector { return this._injector; }
+}

modules/angular2/src/core/application_static.dart

@@ -2,6 +2,7 @@ library angular2.application_static;
 
 import 'dart:async';
 import 'application_common.dart';
+import 'application_ref.dart';
 
 /// Starts an application from a root component.
 ///