docs: public Set<Role> findRoles(final Group userGroup)
      {
          final Set<Role> result = new HashSet<Role>();
          
          Object source;
          for(final RoleMapping mapping : this.getRoleMappings())
          {
              source = mapping.getSource();
              
              if((userGroup != null) && userGroup.equals(source))
              {
                  result.add(mapping.getTarget());
              }
          }
          
          return result;
      }