Hi,
I'm currently working on an alternative implementation of the
TypedFactoryComponentResolver.
My problem is, that I'd like to use typed factories, but I need to return
null, in case the component isn't registered.
The concrete usecase is, that I'm looking for a validator for a specific
type, and if no validator is registered, it should just return null from
the factory.
As the default implementation always throws an exception, if no component
is registered, I've created my own version.
/// <summary>
/// Resolves a component. If the component isn't registered, the resolver
returns null instead of an exception.
/// </summary>
internal class NullSafeTypedFactoryComponentResolver :
TypedFactoryComponentResolver
{
public NullSafeTypedFactoryComponentResolver(string componentName, Type
componentType, IDictionary additionalArguments, bool
fallbackToResolveByTypeIfNameNotFound, Type actualSelectorType)
: base(componentName, componentType, additionalArguments,
fallbackToResolveByTypeIfNameNotFound, actualSelectorType) { }
public override object Resolve(IKernelInternal kernel, IReleasePolicy scope)
{
// Check to see if the component is registered
var hasComponent = componentName != null
? kernel.HasComponent(componentName)
: kernel.HasComponent(componentType);
return hasComponent ? base.Resolve(kernel, scope) : null;
}
}
I'm then overriding the BuildFactoryComponent method from the
DefaultTypedFactoryComponentSelector, to return my own implementation.
Since I'm doing something non-standard, I'd just wanted to make sure, I'm
not misusing (or misunderstanding) the concept of a typed factory.
Basically I'm changing the semantics of the container, so I'm just a bit
uncertain about which implications it may bring.
Thanks,
Kenneth
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