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/>.
+
+from typing import Union
+
+import ifcopenshell
+import ifcopenshell.api.owner
+import ifcopenshell.guid
+
+
+def assign_group(
+    file: ifcopenshell.file, products: list[ifcopenshell.entity_instance], group: ifcopenshell.entity_instance
+) -> Union[ifcopenshell.entity_instance, None]:
+    """Assigns products to a group
+
+    If a product is already assigned to the group, it will not be assigned
+    twice.
+
+    :param products: A list of IfcProduct elements to assign to the group
+    :param group: The IfcGroup to assign the products to
+    :return: The IfcRelAssignsToGroup relationship
+        or `None` if `products` was empty list.
+
+    Example:
+
+    .. code:: python
+
+        group = ifcopenshell.api.group.add_group(model, name="Furniture")
+        ifcopenshell.api.group.assign_group(model,
+            products=model.by_type("IfcFurniture"), group=group)
+    """
+    if not products:
+        return
+
+    is_grouped_by: tuple[ifcopenshell.entity_instance, ...]
+    if not (is_grouped_by := group.IsGroupedBy):
+        return file.create_entity(
+            "IfcRelAssignsToGroup",
+            **{
+                "GlobalId": ifcopenshell.guid.new(),
+                "OwnerHistory": ifcopenshell.api.owner.create_owner_history(file),
+                "RelatedObjects": products,
+                "RelatingGroup": group,
+            },
+        )
+    rel = is_grouped_by[0]
+    related_objects = set(rel.RelatedObjects) or set()
+    products_set = set(products)
+    if products_set.issubset(related_objects):
+        return rel
+    rel.RelatedObjects = list(related_objects | products_set)
+    ifcopenshell.api.owner.update_owner_history(file, element=rel)
+    return rel