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Dion Moult
87 lines
3.3 KiB
Python
87 lines
3.3 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.util.element
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import ifcopenshell.api
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def unassign_reference(
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file: ifcopenshell.file,
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reference: ifcopenshell.entity_instance,
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products: list[ifcopenshell.entity_instance],
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) -> None:
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"""Unassigns a product of products from a reference
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If the product isn't assigned to the reference, nothing will happen.
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:param reference: The IfcLibraryReference to unassign from
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:type reference: ifcopenshell.entity_instance
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:param products: A list of IfcProduct elements to unassign from the reference
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:type products: list[ifcopenshell.entity_instance]
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:return: None
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:rtype: None
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Example:
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.. code:: python
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library = ifcopenshell.api.run("library.add_library", model, name="Brickschema")
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# Let's create a reference to a single AHU in our Brickschema dataset
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reference = ifcopenshell.api.run("library.add_reference", model, library=library)
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ifcopenshell.api.run("library.edit_reference", model,
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reference=reference, attributes={"Identification": "http://example.org/digitaltwin#AHU01"})
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# Let's assume we have an AHU in our model.
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ahu = ifcopenshell.api.run("root.create_entity", model,
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ifc_class="IfcUnitaryEquipment", predefined_type="AIRHANDLER")
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# And now assign the IFC model's AHU with its Brickschema counterpart
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ifcopenshell.api.run("library.assign_reference", model, reference=reference, products=[ahu])
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# Let's change our mind and unassign it.
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ifcopenshell.api.run("library.unassign_reference", model, reference=reference, products=[ahu])
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"""
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settings = {"reference": reference, "products": products}
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# TODO: do we need to support non-ifcroot elements like we do in classification.add_reference?
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reference_rels: set[ifcopenshell.entity_instance] = set()
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products = set(settings["products"])
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for product in products:
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reference_rels.update(product.HasAssociations)
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reference_rels = {
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rel
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for rel in reference_rels
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if rel.is_a("IfcRelAssociatesLibrary") and rel.RelatingLibrary == settings["reference"]
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}
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for rel in reference_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.run("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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