No behavioral changes are made, just code cleanup.

Replaced println() statements with IllegalStateException or
UnsupportedOperationException where appropriate. Removed commented out
debug statements, inconsistent braces style, unnecessary casts and line
breaks.

Change-Id: I35fe3e2c3e216ae25b94a4dbf81c31f974e540e2
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>