If an an inner class, but does not use its embedded reference to the
object which created it. This reference makes the instances of the class
larger, and may keep the reference to the creator object alive longer
than necessary. If possible, the class should be made static.

Signed-off-by: Matthias Becker <ma.becker@sap.com>
Change-Id: Ic2d02e8a0e6e02d88d0f7a1d2708ae7a83c7ce3c