rankeable | Rankeable allows you to easily add rankings | Application Framework library

It seems that technically, there is no limit in the number of multilevel inheritance. Example: class D inherits class C that inherits class B that inherits class A. However their names start getting complicated as you keep inheriting.

It seems to me that, in fact, having a base class and using interfaces would be a better approach.

The problem that I have is that, with interfaces, I have to implement the properties in every class. Using a base class, I implement them in only one place.

In my scenario I have the following:

• Base Class: Animal
• Interfaces: RankeableByLevel (this has additional properties that allow animals to be ranked), FilterableByExpertise (this has additional properties that allow animals to be filtered).

There are 10-15 Animal subclasses, and around 7-8 that would be rankeable and/or filterable. I don't want to implement the interfaces in each of 7-8 classes (too much "duplication" in my opinion).

One option would be to create a base class called AnimalRankeableByLevel and another AnimalRankeableByLevelAndFilterableByExpertise by specially this last one seems too long to be right!

With interfaces, I'd have to "duplicate" implementation too much. With inheriting too many classes, it would look wrong (too long name, too many inheritings).

What would be the solution to this?

Thank you!