94 lines
3.6 KiB
Python
94 lines
3.6 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.pset
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import ifcopenshell.util.element
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def unshare_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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) -> list[ifcopenshell.entity_instance]:
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"""Copy a shared pset as linked only to the provided elements.
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Note that method will create a copy of the pset for each element provided.
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:param products: Elements (or element types) to link the pset to.
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:param pset: Shared property set.
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:return: List of copied property sets.
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Example:
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.. code:: python
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element1 = ifcopenshell.api.root.create_entity(self.file, ifc_class="IfcWall")
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element2 = ifcopenshell.api.root.create_entity(self.file, ifc_class="IfcWall")
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ifcopenshell.api.pset.assign_pset(self.file, [element1, element2], pset)
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# Pset is now shared by 2 elements.
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assert ifcopenshell.util.element.get_elements_by_pset(pset) == {element1, element2}
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new_psets = ifcopenshell.api.pset.unshare_pset(self.file, [element2], pset)
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# element2 was unassigned from the original pset.
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assert ifcopenshell.util.element.get_elements_by_pset(pset) == {element1}
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new_pset = new_psets[0]
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# New pset was created and was assigned to element2.
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assert new_pset != pset
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assert ifcopenshell.util.element.get_elements_by_pset(new_pset) == {element2}
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"""
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if not products:
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raise Exception("No products provided.")
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# If pset has no other elements besides the provided products,
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# then we skip the first product, so it won't get additional pset copy
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# leaving the original pset orphaned.
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pset_elements = ifcopenshell.util.element.get_elements_by_pset(pset)
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products_original = products
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if set(products) == pset_elements:
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products = products[1:]
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if not products:
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raise Exception(f"Provided product is the only element to which pset is assigned: {products_original[0]}.")
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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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ifcopenshell.api.pset.unassign_pset(file, products, pset)
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pset_copies: list[ifcopenshell.entity_instance] = []
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for product in products:
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# No need to consider about profile/material properties since
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# they are assigned to 1 element directly and therefore cannot be shared.
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# Don't copy_deep to keep it light - edit_pset supports unsharing shared props.
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pset_copy = ifcopenshell.util.element.copy(file, pset)
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pset_copies.append(pset_copy)
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ifcopenshell.api.pset.assign_pset(file, [product], pset_copy)
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return pset_copies
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