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_reference(
+    file: ifcopenshell.file,
+    reference: ifcopenshell.entity_instance,
+    products: list[ifcopenshell.entity_instance],
+) -> None:
+    """Unassigns a product of products from a reference
+
+    If the product isn't assigned to the reference, nothing will happen.
+
+    :param reference: The IfcLibraryReference to unassign from
+    :param products: A list of IfcProduct elements to unassign from the reference
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        library = ifcopenshell.api.library.add_library(model, name="Brickschema")
+
+        # Let's create a reference to a single AHU in our Brickschema dataset
+        reference = ifcopenshell.api.library.add_reference(model, library=library)
+        ifcopenshell.api.library.edit_reference(model,
+            reference=reference, attributes={"Identification": "http://example.org/digitaltwin#AHU01"})
+
+        # Let's assume we have an AHU in our model.
+        ahu = ifcopenshell.api.root.create_entity(model,
+            ifc_class="IfcUnitaryEquipment", predefined_type="AIRHANDLER")
+
+        # And now assign the IFC model's AHU with its Brickschema counterpart
+        ifcopenshell.api.library.assign_reference(model, reference=reference, products=[ahu])
+
+        # Let's change our mind and unassign it.
+        ifcopenshell.api.library.unassign_reference(model, reference=reference, products=[ahu])
+    """
+    # TODO: do we need to support non-ifcroot elements like we do in classification.add_reference?
+
+    reference_rels: set[ifcopenshell.entity_instance] = set()
+    products_set = set(products)
+    for product in products_set:
+        reference_rels.update(product.HasAssociations)
+
+    reference_rels = {
+        rel for rel in reference_rels if rel.is_a("IfcRelAssociatesLibrary") and rel.RelatingLibrary == reference
+    }
+
+    for rel in reference_rels:
+        related_objects = set(rel.RelatedObjects) - products_set
+        if related_objects:
+            rel.RelatedObjects = list(related_objects)
+            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)