import java.lang.reflect.InvocationTargetException;

  public Object eInvoke(int operationID, EList<?> arguments) throws InvocationTargetException

  {

    EOperation eOperation = eClass().getEOperation(operationID);

    assert eOperation != null : "Invalid operationID: " + operationID;

    return eInvocationDelegate(eOperation).dynamicInvoke(this, arguments);

  }

  @Override

  public Object eInvoke(EOperation eOperation, EList<?> arguments) throws InvocationTargetException {

    int operationID = eDerivedOperationID(eOperation);

    if (operationID >= 0)

    {

      return eInvoke(operationID, arguments);

    }

    else

    {

      throw new IllegalArgumentException("The operation '" + eOperation.getName() + "' is not a valid operation");

    }

  }

  @Override