facade pattern

The intent of the FACADE pattern is to provide an interface that makes a subsystem easy to use.
Facades often arise out of normal application development.
As you separate your code’s concerns into different classes, you may refactor (restructure) the system by extracting a class whose primary job is to provide simplified access to a subsystem.

http://members.comu.edu.tr/msahin/courses/ust_duzey_files/patterns/facade.pdf