76 lines
3.1 KiB
Python
76 lines
3.1 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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import ifcopenshell
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import ifcopenshell.api.owner
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import ifcopenshell.util.element
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def unassign_object(file: ifcopenshell.file, products: list[ifcopenshell.entity_instance]) -> None:
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"""Unassigns products from their aggregate
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A product (i.e. a smaller part of a whole) may be aggregated into zero
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or one larger space or element. This function will remove that
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aggregation relationship.
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As all physical IFC model elements must be part of a hierarchical tree
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called the "spatial decomposition", using this function will remove the
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product from that tree. This is a dangerous operation and may result in
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the product no longer being visible in IFC applications.
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If the product is not part of an aggregation relationship, nothing will
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happen.
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:param products: The list of parts of the aggregate, typically of IfcElements or
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IfcSpatialStructureElement subclass
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:return: None
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Example:
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.. code:: python
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element = ifcopenshell.api.root.create_entity(model, ifc_class="IfcSite")
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subelement1 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuilding")
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subelement2 = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuilding")
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ifcopenshell.api.aggregate.assign_object(model, products=[subelement1], relating_object=element)
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ifcopenshell.api.aggregate.assign_object(model, products=[subelement2], relating_object=element)
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# nothing is returned
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ifcopenshell.api.aggregate.unassign_object(model, products=[subelement1])
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# nothing is returned, relationship is removed
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ifcopenshell.api.aggregate.unassign_object(model, products=[subelement2])
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"""
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settings = {"products": products}
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products = set(settings["products"])
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rels = set(
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rel
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for product in products
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if (rel := next((rel for rel in product.Decomposes if rel.is_a("IfcRelAggregates")), None))
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)
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for rel in rels:
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related_objects = set(rel.RelatedObjects) - products
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if related_objects:
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rel.RelatedObjects = list(related_objects)
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ifcopenshell.api.owner.update_owner_history(file, element=rel)
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else:
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history = rel.OwnerHistory
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file.remove(rel)
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if history:
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ifcopenshell.util.element.remove_deep2(file, history)
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