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Dion Moult
67 lines
2.7 KiB
Python
67 lines
2.7 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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class Usecase:
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def __init__(self, file, product=None, constraint=None):
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"""Assigns a constraint to a product
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This assigns a relationship between a product and a constraint, so that
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when a product's properties and quantities do not match the requirements
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of the constraint's metrics, results can be flagged.
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It is assumed (but not explicit in the IFC documentation) that
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constraints are inherited from the type. This way, it is not necessary
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to create lots of constraint assignments.
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:param product: The product the constraint applies to. This is anything
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which can have properties or quantities.
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:type product: ifcopenshell.entity_instance.entity_instance
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:param constraint: The IfcObjective constraint
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:type constraint: ifcopenshell.entity_instance.entity_instance
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:return: The new or updated IfcRelAssociatesConstraint relationship
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:rtype: ifcopenshell.entity_instance.entity_instance
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"""
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self.file = file
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self.settings = {
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"product": product,
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"constraint": constraint,
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}
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def execute(self):
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rel = self.get_constraint_rel()
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related_objects = set(rel.RelatedObjects) if rel.RelatedObjects else set()
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related_objects.add(self.settings["product"])
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rel.RelatedObjects = list(related_objects)
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return rel
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def get_constraint_rel(self):
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for rel in self.file.by_type("IfcRelAssociatesConstraint"):
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if rel.RelatingConstraint == self.settings["constraint"]:
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return rel
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return self.file.create_entity(
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"IfcRelAssociatesConstraint",
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**{
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"GlobalId": ifcopenshell.guid.new(),
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# TODO: owner history
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"RelatingConstraint": self.settings["constraint"],
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}
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)
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