Source code for aiida.orm.nodes.process.workflow.workfunction

# -*- coding: utf-8 -*-
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# Copyright (c), The AiiDA team. All rights reserved.                     #
# This file is part of the AiiDA code.                                    #
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# 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               #
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"""Module with `Node` sub class for workflow function processes."""

from aiida.common.links import LinkType
from aiida.orm.utils.mixins import FunctionCalculationMixin

from .workflow import WorkflowNode

__all__ = ('WorkFunctionNode',)


[docs]class WorkFunctionNode(FunctionCalculationMixin, WorkflowNode): """ORM class for all nodes representing the execution of a workfunction.""" # 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 workfunction cannot create Data, so if we receive an outgoing RETURN link to an unstored Data node, that means the user created a Data node within our function body and is trying to return it. This use case should be reserved for @calcfunctions, as they can have CREATE 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.RETURN and not target.is_stored: raise ValueError( 'trying to return an unstored Data node from a @workfunction, however, @workfunctions cannot create ' 'data. You probably want to use a @calcfunction instead.' )