A utility for determining the shortest path through fields from a starting object to a target object. The search is performed breadth-first to ensure the shortest path is found.
Mark van Gulik
Create the instance, but don't start the search.
The initial object from which to begin the path search.
The object to which to find a path, starting at start.
Answer the shortest chain of objects starting with start and ending with target. If no such chain was found, answer null.
null