I am writing a method that needs to break a delta into pieces (e.g. two deltas that result in the same patch as the original delta). The current design is problematic because:

1. I don't want my method to know/care what the delta type is.
2. TheAbstractDelta class is abstract, so I cannot simply invoke its constructor.
3. TheAbstractDelta subtypes do not providewith() methods.
4. Some of your code (e.g.DiffRowGenerator) check the class type instance (e.g.if (delta instanceof InsertDelta) instead of usingAbstractDelta.getType() so I cannot subclassAbstractDelta myself.

Probably the easiest way to resolve this is to add an abstractwithChunks(Chunk<T> original, Chunk<T> revised) method toAbstractDelta.