Fixed checkstyle violations

Signed-off-by: Dominik Schadow <dominikschadow@googlemail.com>
Fixed checkstyle violations

Signed-off-by: Dominik Schadow <dominikschadow@googlemail.com>
Added license information, fixed checkstyle violations

Signed-off-by: Dominik Schadow <dominikschadow@googlemail.com>
Fixed checkstyle violations

Signed-off-by: Dominik Schadow <dominikschadow@googlemail.com>