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Dion Moult
94 lines
4.3 KiB
Python
94 lines
4.3 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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class Usecase:
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def __init__(self, file, product=None):
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"""Removes any material relationship with a product
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A product can only have one material assigned to it, which is why it is
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not necessary to specify the material to unassign. The material is not
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removed, only the relationship is removed.
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If the product does not have a material, nothing happens.
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:param product: The IfcProduct that may or may not have a material
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:type product: ifcopenshell.entity_instance.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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concrete = ifcopenshell.api.run("material.add_material", model, name="CON01", category="concrete")
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# Let's imagine a concrete bench made out of concrete.
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bench_type = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcFurnitureType")
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ifcopenshell.api.run("material.assign_material", model,
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product=bench_type, type="IfcMaterial", material=concrete)
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# Let's change our mind and remove the concrete assignment. The
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# concrete material still exists, but the bench is no longer made
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# out of concrete now.
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ifcopenshell.api.run("material.unassign_material", model, product=bench_type)
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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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if self.settings["product"].is_a("IfcTypeObject"):
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material = ifcopenshell.util.element.get_material(self.settings["product"])
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if material.is_a() in ["IfcMaterialLayerSet", "IfcMaterialProfileSet"]:
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# Remove set usages
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for inverse in self.file.get_inverse(material):
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if self.file.schema == "IFC2X3":
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if not inverse.is_a("IfcMaterialLayerSetUsage"):
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continue
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for inverse2 in self.file.get_inverse(inverse):
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if inverse2.is_a("IfcRelAssociatesMaterial"):
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history = inverse2.OwnerHistory
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self.file.remove(inverse2)
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if history:
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ifcopenshell.util.element.remove_deep2(self.file, history)
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else:
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if not inverse.is_a("IfcMaterialUsageDefinition"):
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continue
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for rel in inverse.AssociatedTo:
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self.file.remove(rel)
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self.file.remove(inverse)
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for rel in self.settings["product"].HasAssociations:
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if rel.is_a("IfcRelAssociatesMaterial"):
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if rel.RelatingMaterial.is_a() in ["IfcMaterialLayerSetUsage", "IfcMaterialProfileSetUsage"]:
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# Warning: this may leave the model in a non-compliant state.
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if self.file.get_total_inverses(rel.RelatingMaterial) == 1 and len(rel.RelatedObjects) == 1:
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self.file.remove(rel.RelatingMaterial)
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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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continue
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related_objects = set(rel.RelatedObjects)
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related_objects.remove(self.settings["product"])
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rel.RelatedObjects = list(related_objects)
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