First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+import ifcopenshell
+import ifcopenshell.api.owner
+import ifcopenshell.util.element
+
+
+def unassign_constraint(
+    file: ifcopenshell.file,
+    products: list[ifcopenshell.entity_instance],
+    constraint: ifcopenshell.entity_instance,
+) -> None:
+    """Unassigns a constraint from a list of products
+
+    The constraint will not be deleted and is available to be assigned to
+    other products.
+
+    :param products: The list of products the constraint applies to.
+    :param constraint: The IfcObjective constraint
+    :return: None
+    """
+    usecase = Usecase()
+    usecase.file = file
+    return usecase.execute(products, constraint)
+
+
+class Usecase:
+    file: ifcopenshell.file
+
+    def execute(self, products_: list[ifcopenshell.entity_instance], constraint: ifcopenshell.entity_instance):
+        if not products_:
+            return
+        products_set = set(products_)
+
+        rels = self.get_constraint_rels(constraint)
+        related_objects = set()
+        for rel in rels:
+            related_objects.update(rel.RelatedObjects)
+
+        if not related_objects.intersection(products_set):
+            return
+
+        for rel in rels:
+            related_objects = set(rel.RelatedObjects)
+            if not related_objects.intersection(products_set):
+                continue
+            related_objects -= products_set
+            if related_objects:
+                rel.RelatedObjects = list(related_objects)
+                ifcopenshell.api.owner.update_owner_history(self.file, element=rel)
+                continue
+
+            history = rel.OwnerHistory
+            self.file.remove(rel)
+            if history:
+                ifcopenshell.util.element.remove_deep2(self.file, history)
+
+    def get_constraint_rels(self, cosntraint: ifcopenshell.entity_instance) -> list[ifcopenshell.entity_instance]:
+        rels = []
+        for rel in self.file.get_inverse(cosntraint):
+            if rel.is_a("IfcRelAssociatesConstraint"):
+                rels.append(rel)
+        return rels