- All Known Implementing Classes:
public interface ObjectProviderObject providers represent an alternate way to locate an object provided somewhere in the
Registry. Instead of using a just the service id to gain access to a service within the Registry, object providers in different flavors are capable of vending, or even creating, objects of disparate types from disparate sources. Object providers are consulted in a strict order, and the first non-null result is taken. In many cases, an object provider searches for additional annotations on the element (usually a parameter, or perhaps a field) for which a value is required.
<T> T provide(Class<T> objectType, AnnotationProvider annotationProvider, ObjectLocator locator)Provides an object based on an expression. The process of providing objects occurs within a particular context, which will typically be a service builder method, service contributor method, or service decorator method. The locator parameter provides access to the services visible to that context.
- Type Parameters:
objectType- the expected object type
annotationProvider- provides access to annotations (typically, the field or parameter to which an injection-related annotation is attached); annotations on the field or parameter may also be used when resolving the desired object
locator- locator for the context in which the provider is being used
- the requested object, or null if this object provider can not supply an object
RuntimeException- if the expression can not be evaluated, or the type of object identified is not assignable to the type specified by the objectType parameter