@injectionHandler
Make sure to first read the introduction to dependency injection and the
@injectdocumentation.
Registers a method as an injection handler, allowing it to fulfill injections explicitly. It is essentially a more powerful alternative to @injectable.
@injectionHandler(targetType)
Where targetType can be any class.
May be applied to a static method to handle injections for the targetType directly. The method return a value compatible to the given type or null/undefined to leave the injection unhandled. The method is also passed an Injection object of the following type:
{
type: Class,
injector: Injector,
param: object | string | number | boolean | null
}
Where…
-
typeis the exact type that was requested. May be identical to the type parameter of the decorator, or another compatible class. -
injectoris theInjectorinstance the injection handler is registered with. May be used to create or resolve other objects. -
paramis an injection parameter that may have been passed via@inject(param)orresolve(type, param).
Example:
import {injectionHandler, Injection} from 'tabris-decorators';
class MyInjectionHandler {
@injectionHandler(Foo)
static handleInjection(injection: Injection) {
return new Foo();
}
}
If no compatible value is returned the next injection handler is called. If no injection handler returns a compatible value the injection fails. (@injectable implicitly creates an injection handler.) A single class may hold any number of injection handler methods. The name of an injection handler methods is not relevant.
@injectionHandler({targetType, priority?})
Where targetType can be any class and priority - if given - has to be a number.
Like @injectionHandler(targetType), but allows to give a priority, just like @injectable({priority}). The priority controls in which order injection handlers for the same target type are called, with the highest priority handler being called first.
