First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
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+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2022 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_container(file: ifcopenshell.file, products: list[ifcopenshell.entity_instance]) -> None:
+    """Unassigns a container from products.
+
+    :param product: A list of IfcProducts to remove the containment from.
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        project = ifcopenshell.api.root.create_entity(model, ifc_class="IfcProject")
+        site = ifcopenshell.api.root.create_entity(model, ifc_class="IfcSite")
+        building = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuilding")
+        storey = ifcopenshell.api.root.create_entity(model, ifc_class="IfcBuildingStorey")
+
+        # The project contains a site (note that project aggregation is a special case in IFC)
+        ifcopenshell.api.aggregate.assign_object(model, products=[site], relating_object=project)
+
+        # The site has a building, the building has a storey, and the storey has a space
+        ifcopenshell.api.aggregate.assign_object(model, products=[building], relating_object=site)
+        ifcopenshell.api.aggregate.assign_object(model, products=[storey], relating_object=building)
+
+        # Create a wall
+        wall = ifcopenshell.api.root.create_entity(model, ifc_class="IfcWall")
+
+        # The wall is in the storey
+        ifcopenshell.api.spatial.assign_container(model, products=[wall], relating_structure=storey)
+
+        # Not anymore!
+        ifcopenshell.api.spatial.unassign_container(model, products=[wall])
+    """
+    products_set = set(products)
+    rels = set(rel for product in products_set if (rel := next(iter(product.ContainedInStructure), None)))
+
+    for rel in rels:
+        related_elements = set(rel.RelatedElements) - products_set
+        if related_elements:
+            rel.RelatedElements = list(related_elements)
+            ifcopenshell.api.owner.update_owner_history(file, element=rel)
+        else:
+            history = rel.OwnerHistory
+            file.remove(rel)
+            if history:
+                ifcopenshell.util.element.remove_deep2(file, history)