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 Any
+
+import ifcopenshell.api.geometry
+import ifcopenshell.util.element
+
+
+def unassign_representation(
+    file: ifcopenshell.file, product: ifcopenshell.entity_instance, representation: ifcopenshell.entity_instance
+) -> None:
+    usecase = Usecase()
+    usecase.file = file
+    usecase.settings = {"product": product, "representation": representation}
+    return usecase.execute()
+
+
+class Usecase:
+    file: ifcopenshell.file
+    settings: dict[str, Any]
+
+    def execute(self) -> None:
+        product: ifcopenshell.entity_instance = self.settings["product"]
+        representation: ifcopenshell.entity_instance = self.settings["representation"]
+        if product.is_a("IfcProduct"):
+            self.unassign_product_representation(product, representation)
+        elif product.is_a("IfcTypeProduct"):
+            self.unassign_type_representation()
+
+    def unassign_product_representation(
+        self, product: ifcopenshell.entity_instance, representation: ifcopenshell.entity_instance
+    ) -> None:
+        representations = list(product.Representation.Representations or [])
+        if representation not in representations:
+            return
+        representations.remove(representation)
+        if not representations:
+            product_def = product.Representation
+            # TODO: should somehow find matching shape aspect and remove it
+            # even before the last representation is removed.
+            self.process_shape_aspects(product_def)
+            self.file.remove(product_def)
+        else:
+            product.Representation.Representations = representations
+
+    def unassign_type_representation(self) -> None:
+        matching_representation_map = None
+
+        for representation_map in self.settings["product"].RepresentationMaps or []:
+            if representation_map.MappedRepresentation == self.settings["representation"]:
+                matching_representation_map = representation_map
+                break
+
+        if matching_representation_map:
+            self.unassign_products_using_mapped_representation(matching_representation_map)
+            self.settings["product"].RepresentationMaps = [
+                rm for rm in self.settings["product"].RepresentationMaps if rm != matching_representation_map
+            ] or None
+            self.process_shape_aspects(matching_representation_map)
+            self.remove_representation_map_only(matching_representation_map)
+
+    def process_shape_aspects(self, product_representation: ifcopenshell.entity_instance) -> None:
+        # Technically IfcShapeAspect doesn't become invalid when product representation is removed,
+        # but shape aspect makes sense only in context of some other representation.
+        if self.file.schema == "IFC2X3" and product_representation.is_a("IfcRepresentationMap"):
+            shape_aspects = [
+                a
+                for a in self.file.by_type("IfcShapeAspect")
+                if a.PartOfProductDefinitionShape == product_representation
+            ]
+        else:
+            shape_aspects = product_representation.HasShapeAspects
+        for shape_aspect in shape_aspects:
+            representations = shape_aspect.ShapeRepresentations
+            self.file.remove(shape_aspect)
+            for rep in representations:
+                ifcopenshell.api.geometry.remove_representation(self.file, rep)
+
+    def remove_representation_map_only(self, representation_map: ifcopenshell.entity_instance) -> None:
+        representation_map.MappedRepresentation = self.file.createIfcShapeRepresentation()
+        ifcopenshell.util.element.remove_deep2(self.file, representation_map)
+
+    def unassign_products_using_mapped_representation(self, representation_map: ifcopenshell.entity_instance) -> None:
+        mapped_representations: list[dict[str, ifcopenshell.entity_instance]] = []
+        just_representations: list[ifcopenshell.entity_instance] = []
+        for map_usage in representation_map.MapUsage or []:
+            for inverse in self.file.get_inverse(map_usage):
+                if not inverse.is_a("IfcShapeRepresentation"):
+                    continue
+                for definition in inverse.OfProductRepresentation or []:
+                    for product in definition.ShapeOfProduct or []:
+                        mapped_representations.append({"product": product, "representation": inverse})
+                        just_representations.append(inverse)
+        for item in mapped_representations:
+            self.unassign_product_representation(item["product"], item["representation"])
+        for representation in just_representations:
+            ifcopenshell.api.geometry.remove_representation(self.file, representation=representation)