import {CONST} from "angular2/src/facade/lang"; /** * A parameter annotation that creates a synchronous eager dependency. * * ``` * class AComponent { * constructor(@Inject('aServiceToken') aService) {} * } * ``` * */ export class Inject { token; @CONST() constructor(token) { this.token = token; } } /** * A parameter annotation that creates an asynchronous eager dependency. * * ``` * class AComponent { * constructor(@InjectPromise('aServiceToken') aServicePromise) { * aServicePromise.then(aService => ...); * } * } * ``` * */ export class InjectPromise { token; @CONST() constructor(token) { this.token = token; } } /** * A parameter annotation that creates a synchronous lazy dependency. * * ``` * class AComponent { * constructor(@InjectLazy('aServiceToken') aServiceFn) { * aService = aServiceFn(); * } * } * ``` * */ export class InjectLazy { token; @CONST() constructor(token) { this.token = token; } } /** * A parameter annotation that marks a dependency as optional. * * ``` * class AComponent { * constructor(@Optional() dp:Dependency) { * this.dp = dp; * } * } * ``` * */ export class Optional { @CONST() constructor() { } } /** * `DependencyAnnotation` is used by the framework to extend DI. * * Only annotations implementing `DependencyAnnotation` will be added * to the list of dependency properties. * * For example: * * ``` * class Parent extends DependencyAnnotation {} * class NotDependencyProperty {} * * class AComponent { * constructor(@Parent @NotDependencyProperty aService:AService) {} * } * ``` * * will create the following dependency: * * ``` * new Dependency(Key.get(AService), [new Parent()]) * ``` * * The framework can use `new Parent()` to handle the `aService` dependency * in a specific way. * */ export class DependencyAnnotation { @CONST() constructor() { } } /** * A class annotation that marks a class as available to `Injector`s for * creation. * * ``` * class NeedsService { * constructor(svc:UsefulService) {} * } * * @Injectable * class UsefulService {} * ``` */ export class Injectable { @CONST() constructor() { } }