docs: private void unmap(final Object source, final Role role)
      {
          RoleMapping mapping;
          for(int i = this.getRoleMappings().size(); i >= 0; i--)
          {
              mapping = this.getRoleMappings().get(i);
              
              if(mapping.getSource().equals(source) && mapping.getTarget().equals(role))
              {
                  this.getRoleMappings().remove(i);
              }
          }
      }