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.util.element
+
+
+def remove_classification(file: ifcopenshell.file, classification: ifcopenshell.entity_instance) -> None:
+    """Removes an IfcClassification from the project and all references
+
+    The classification and all of its relationships, children references,
+    and relationships between objects and child references are completely
+    removed from a project.
+
+    :param classification: The IfcClassification entity you want to remove
+    :return: None
+
+    Example:
+
+    .. code:: python
+
+        classification = model.by_type("IfcClassification")[0]
+        ifcopenshell.api.classification.remove_classification(model,
+            classification=classification)
+    """
+    usecase = Usecase()
+    usecase.file = file
+    return usecase.execute(classification)
+
+
+class Usecase:
+    file: ifcopenshell.file
+
+    def execute(self, classification: ifcopenshell.entity_instance) -> None:
+        references = self.get_references(classification)
+        for reference in references:
+            self.file.remove(reference)
+        self.file.remove(classification)
+        for rel in self.file.by_type("IfcRelAssociatesClassification"):
+            if not rel.RelatingClassification:
+                history = rel.OwnerHistory
+                self.file.remove(rel)
+                if history:
+                    ifcopenshell.util.element.remove_deep2(self.file, history)
+
+        if self.file.schema != "IFC2X3":
+            for rel in self.file.by_type("IfcExternalReferenceRelationship"):
+                if not rel.RelatingReference:
+                    self.file.remove(rel)
+
+    def get_references(self, classification: ifcopenshell.entity_instance) -> list[ifcopenshell.entity_instance]:
+        results = []
+        if self.file.schema == "IFC2X3":
+            for reference in self.file.by_type("IfcClassificationReference"):
+                if reference.ReferencedSource == classification:
+                    results.append(reference)
+        else:
+            for reference in classification.HasReferences:
+                results.append(reference)
+                results.extend(self.get_references(reference))
+        return results