This code is free software: you can redistribute it and/or modify it under
  the terms of the GNU Lesser General Public License version 3 only, as
  published by the Free Software Foundation.
 
  This code is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
  version 3 for more details.
 
  You should have received a copy of the GNU Lesser General Public License
  version 3 along with this work.  If not, see <http://www.gnu.org/licenses/>.