Determine if an object is accessible from another object

[Robert Schneider]

I would like to find out if an object A is accessible from object B. But
consider indirections as well. So object B might access oject C and object C
references object D through a collection (what would actually be object E)
that finally references object A.

Do you know of any simple and dynamic/scalable solution? Since the classes
with which the solution works could get more. Then the solution should work
without any changes.

Another wish (task) is that I would like to know which objects uses object
A. I assume that I start from one object for the search. I think this task
could be merged with the first mentioned one.

I guess reflection is the appropiate means. But I'm not sure if the solution
gets simple or complex. I may oversee some issues. I think I would have to
go through the fields of a class recursively and check if the object
references the other object that I'm searching for. But is this sufficient?
Or does this solution lacks anything?

Assume that all object does not have circular references. But it would be
interesting to know how this could get accomplished.

Greetings,
Robert
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