95 lines
3.7 KiB
Python
95 lines
3.7 KiB
Python
# IfcOpenShell - IFC toolkit and geometry engine
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# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
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#
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# This file is part of IfcOpenShell.
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#
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# IfcOpenShell is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# IfcOpenShell is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with IfcOpenShell. If not, see <http://www.gnu.org/licenses/>.
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from typing import Union
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import ifcopenshell
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import ifcopenshell.api.owner
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import ifcopenshell.guid
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def assign_pset(
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file: ifcopenshell.file,
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products: list[ifcopenshell.entity_instance],
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pset: ifcopenshell.entity_instance,
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) -> Union[ifcopenshell.entity_instance, None]:
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"""Assign property set to provided elements.
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This method can be used to make psets shared by multiple elements.
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:param products: Elements (or element types) to assign the pset to.
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:param pset: Property set.
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:return: None if `products` is empty or has only type elements.
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IfcRelDefinesByProperties if `products` contains occurrences.
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Example:
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.. code:: python
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element = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
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ifcopenshell.api.pset.assign_pset(model, [element], pset)
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# Pset is now assigned.
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assert ifcopenshell.util.element.get_elements_by_pset(pset) == {element}
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element1 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
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element2 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
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ifcopenshell.api.pset.assign_pset(model, [element1, element2], pset)
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# Pset is now shared by multiple elements.
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assert ifcopenshell.util.element.get_elements_by_pset(pset) == {element, element1, element2}
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# Same for element types.
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element_type = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWallType")
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ifcopenshell.api.pset.assign_pset(model, [element_type], type_pset)
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# Pset is now assigned to the type.
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assert ifcopenshell.util.element.get_elements_by_pset(type_pset) == {element_type}
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"""
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is_ifc2x3 = file.schema == "IFC2X3"
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products_occurrences: set[ifcopenshell.entity_instance] = set()
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products_types: set[ifcopenshell.entity_instance] = set()
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for product in products:
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if product.is_a("IfcTypeProduct"):
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products_types.add(product)
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else:
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products_occurrences.add(product)
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rel = None
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# Check occurrences using pset.
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if products_occurrences:
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rels = pset.PropertyDefinitionOf if is_ifc2x3 else pset.DefinesOccurrence
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rel = next(iter(rels), None)
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if rel is not None:
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objs = set(rel.RelatedObjects) | products_occurrences
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rel.RelatedObjects = list(objs)
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else:
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rel = file.create_entity(
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"IfcRelDefinesByProperties",
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**{
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"GlobalId": ifcopenshell.guid.new(),
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"OwnerHistory": ifcopenshell.api.owner.create_owner_history(file),
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"RelatedObjects": list(products_occurrences),
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"RelatingPropertyDefinition": pset,
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},
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)
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for product in products_types:
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psets = list(product.HasPropertySets or [])
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product.HasPropertySets = psets + [pset]
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return rel
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