public boolean containsCountry ( @ Nullable final String sCountry ) { if ( sCountry == null ) return false ; final String sValidCountry = LocaleHelper . getValidCountryCode ( sCountry ) ; if ( sValidCountry == null ) return false ; return m_aRWLock . readLocked ( ( ) -> m_aCountries . contains ( sValidCountry ) ) ; }
Check if the passed country is known .