# -*- coding: utf-8 -*- ########################################################################### # Copyright (c), The AiiDA team. All rights reserved. # # This file is part of the AiiDA code. # # # # The code is hosted on GitHub at https://github.com/aiidateam/aiida-core # # For further information on the license, see the LICENSE.txt file # # For further information please visit http://www.aiida.net # ########################################################################### """Module with `Node` sub class for calculation function processes.""" from aiida.common.links import LinkType from aiida.orm.utils.mixins import FunctionCalculationMixin from .calculation import CalculationNode __all__ = ('CalcFunctionNode',) [docs]class CalcFunctionNode(FunctionCalculationMixin, CalculationNode): """ORM class for all nodes representing the execution of a calcfunction.""" # pylint: disable=too-few-public-methods [docs] def validate_outgoing(self, target, link_type, link_label): """ Validate adding a link of the given type from ourself to a given node. A calcfunction cannot return Data, so if we receive an outgoing link to a stored Data node, that means the user created a Data node within our function body and stored it themselves or they are returning an input node. The latter use case is reserved for @workfunctions, as they can have RETURN links. :param target: the node to which the link is going :param link_type: the link type :param link_label: the link label :raise TypeError: if `target` is not a Node instance or `link_type` is not a `LinkType` enum :raise ValueError: if the proposed link is invalid """ super().validate_outgoing(target, link_type, link_label) if link_type is LinkType.CREATE and target.is_stored: raise ValueError( 'trying to return an already stored Data node from a @calcfunction, however, @calcfunctions cannot ' 'return data. If you stored the node yourself, simply do not call `store()` yourself. If you want to ' 'return an input node, use a @workfunction instead.' )