Returns the currently registered service provider object that is of the given class type. At most one object of a given class is allowed to be registered at any given time. If no registered object has the desired class type, null is returned.

Parameters:

providerClass		the Class of the desired service provider object.
<T>		the type of the provider.

Returns:  a currently registered service provider object with the desired Classtype, or null is none is present.

Exceptions:

IllegalArgumentException

if providerClass is null.