code: protected final void readAbstractSingletonFields (@Nonnull final ObjectInputStream aOIS) throws IOException,
                                                                                             ClassNotFoundException
    {
      m_aStatus = (BitSet) aOIS.readObject ();
    }
docs: Set all internal status variables to the values read from the specified
  {@link ObjectInputStream}. This can be used to make singletons
  serializable.
  
  @param aOIS
  The input stream to read from. May not be <code>null</code>.
  @throws IOException
  In case reading failed
  @throws ClassNotFoundException
  In case reading failed