docs: private void verifyOperation(UpdateOperation operation, Class<? extends DBObject> updatesClass) {
          if (this.operation == null) {
              this.operation = operation;
  
              try {
                  this.updates = updatesClass.newInstance();
              } catch (Exception e) {
                  throw new JeppettoException(e);
              }
          } else if (this.operation != operation) {
              throw new JeppettoException("Can't switch operation type to '" + operation + "'.  '"
                                          + this.operation + "' is already in use.");
          }
      }