Demeter's Law

[vagosdim]

Avoid:
o.getSubPart100().getSubpart12().getsubpart17().doSth();

Do: make class subPart100 to export a facade method

• dosthWithSupart12And17();

s.t. the clients DO NOT depent on
(a) subPart100
(b) subPart12
(c) subPart17
(d) result of doSth()

/* iteratively, the subPart classes can do also a facade method for the work of their components */

Demeter: a class should depend only on its attributes + IMMEDIATE collaborators