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Dion Moult
79 lines
3.6 KiB
Python
79 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
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import ifcopenshell.util.element
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class Usecase:
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def __init__(self, file, product=None):
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"""Unassigns a product from its 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 product: The part of the aggregate, typically an IfcElement or
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IfcSpatialStructureElement subclass
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:type product: ifcopenshell.entity_instance.entity_instance
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:return: The IfcRelAggregate relationship instance, only returned if the
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whole still contains any other parts.
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:rtype: ifcopenshell.entity_instance.entity_instance, None
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Example:
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.. code:: python
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element = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcSite")
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subelement1 = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuilding")
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subelement2 = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBuilding")
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ifcopenshell.api.run("aggregate.assign_object", model, product=subelement1, relating_object=element)
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ifcopenshell.api.run("aggregate.assign_object", model, product=subelement2, relating_object=element)
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# The relationship is returned as element still has subelement2
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rel = ifcopenshell.api.run("aggregate.unassign_object", model, product=subelement1)
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# Nothing is returned, as element is now empty
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ifcopenshell.api.run("aggregate.unassign_object", model, product=subelement2)
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"""
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self.file = file
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self.settings = { "product": product }
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def execute(self):
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for rel in self.settings["product"].Decomposes or []:
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if not rel.is_a("IfcRelAggregates"):
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continue
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if len(rel.RelatedObjects) == 1:
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history = rel.OwnerHistory
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self.file.remove(rel)
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if history:
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ifcopenshell.util.element.remove_deep2(self.file, history)
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return
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related_objects = list(rel.RelatedObjects)
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related_objects.remove(self.settings["product"])
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rel.RelatedObjects = related_objects
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ifcopenshell.api.run("owner.update_owner_history", self.file, **{"element": rel})
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return rel
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