mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-10 09:48:32 +00:00
Dion Moult
223 lines
9.4 KiB
Python
223 lines
9.4 KiB
Python
import os
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import json
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import time
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import ifcopenshell
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# This is highly experimental and incomplete, however, it may work for simple datasets.
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# In this simple implementation, we only support 2X3<->4 right now
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cwd = os.path.dirname(os.path.realpath(__file__))
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def is_a(entity, ifc_class):
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ifc_class = ifc_class.lower()
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if entity.name_lc() == ifc_class:
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return True
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if entity.supertype():
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return is_a(entity.supertype(), ifc_class)
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return False
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def reassign_class(ifc_file, element, new_class):
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try:
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new_element = ifc_file.create_entity(new_class)
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except:
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print(f"Class of {element} could not be changed to {new_class}")
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return element
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new_attributes = [new_element.attribute_name(i) for i, attribute in enumerate(new_element)]
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for i, attribute in enumerate(element):
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try:
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new_element[new_attributes.index(element.attribute_name(i))] = attribute
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except:
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continue
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for inverse in ifc_file.get_inverse(element):
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ifcopenshell.util.element.replace_attribute(inverse, element, new_element)
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ifc_file.remove(element)
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return new_element
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class Migrator:
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def __init__(self):
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self.migrated_ids = {}
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self.class_4_to_2x3 = json.load(open(os.path.join(cwd, "class_4_to_2x3.json"), "r"))
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# IFC4 classes, and their IFC4 attribute : IFC2X3 attributes
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self.attribute_4_to_2x3 = json.load(open(os.path.join(cwd, "attribute_4_to_2x3.json"), "r"))
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self.default_values = {
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"ChangeAction": "NOCHANGE",
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"CompositionType": "ELEMENT",
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"CrossSectionArea": 1,
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"DataValue": 0,
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"DefinedValues": [0],
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"DefiningValues": [0],
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"DestabilizingLoad": False,
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"Edition": "",
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"EndParam": 1.0,
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"EnumerationValues": [0],
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"GeodeticDatum": "",
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"Intent": "",
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"IsHeading": False,
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"ListValues": [0],
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"LongitudinalBarCrossSectionArea": 1,
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"LongitudinalBarNominalDiameter": 1,
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"LongitudinalBarSpacing": 1,
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"Name": "",
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"NominalDiameter": 1,
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"PredefinedType": "NOTDEFINED",
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"RowCells": [0],
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"SequenceType": "NOTDEFINED",
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"Source": "",
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"StartParam": 0.0,
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"TransverseBarCrossSectionArea": 1,
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"TransverseBarNominalDiameter": 1,
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"TransverseBarSpacing": 1,
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# Manual additions from experience
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"InteriorOrExteriorSpace": "NOTDEFINED",
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}
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self.default_entities = {
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"CurrentValue": None,
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"DepreciatedValue": None,
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"Jurisdiction": None,
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"OriginalValue": None,
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"Owner": None,
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"OwnerHistory": None,
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"Position": None,
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"PropertyReference": None,
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"RepresentationContexts": None,
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"ResponsiblePerson": None,
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"ResponsiblePersons": None,
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"Rows": None,
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"TotalReplacementCost": None,
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"UnitsInContext": None,
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"User": None,
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}
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def migrate(self, element, new_file):
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try:
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return new_file.by_id(self.migrated_ids[element.id()])
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except:
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pass
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# print("Migrating", element)
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schema = ifcopenshell.ifcopenshell_wrapper.schema_by_name(new_file.schema)
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new_element = self.migrate_class(element, new_file)
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# print("Migrated class from {} to {}".format(element, new_element))
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new_element_schema = schema.declaration_by_name(new_element.is_a())
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if not hasattr(new_element_schema, "all_attributes"):
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return element # The element has no attributes, so migration is done
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new_element = self.migrate_attributes(element, new_file, new_element, new_element_schema)
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self.migrated_ids[element.id()] = new_element.id()
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return new_element
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def migrate_class(self, element, new_file):
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try:
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new_element = new_file.create_entity(element.is_a())
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except:
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# The element does not exist in this schema
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# Complex migration is not yet supported (e.g. polygonal face set to faceted brep)
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if new_file.schema == "IFC2X3":
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new_element = new_file.create_entity(self.class_4_to_2x3[element.is_a()])
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elif new_file.schema == "IFC4":
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print("Class migration to IFC4 not yet supported for", element)
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pass
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return new_element
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def migrate_attributes(self, element, new_file, new_element, new_element_schema):
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for i, attribute in enumerate(new_element_schema.all_attributes()):
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if new_element_schema.derived()[i]:
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continue
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self.migrate_attribute(attribute, element, new_file, new_element, new_element_schema)
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return new_element
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def migrate_attribute(self, attribute, element, new_file, new_element, new_element_schema):
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# print("Migrating attribute", element, new_element, attribute.name())
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if hasattr(element, attribute.name()):
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value = getattr(element, attribute.name())
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# print("Attribute names matched", value)
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elif new_file.schema == "IFC2X3":
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# IFC4 to IFC2X3: We know the IFC2X3 attribute name, but not its IFC4 equivalent
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# print("Searching for an equivalent", new_element, attribute.name())
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try:
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equivalent_map = self.attribute_4_to_2x3[new_element.is_a()]
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equivalent = list(equivalent_map.keys())[list(equivalent_map.values()).index(attribute.name())]
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if hasattr(element, equivalent):
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# print("Equivalent found", equivalent)
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value = getattr(element, equivalent)
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else:
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return
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except:
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print(
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"Unable to find equivalent attribute of {} to migrate from {} to {}".format(
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attribute.name(), element, new_element
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)
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)
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return # We tried our best
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elif new_file.schema == "IFC4":
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# IFC2X3 to IFC4: We know the IFC4 attribute name, but not its IFC2X3 equivalent
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# print("Searching for an equivalent", element, new_element, attribute.name())
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try:
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equivalent = self.attribute_4_to_2x3[new_element.is_a()][attribute.name()]
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# print("Searching for equivalent", equivalent)
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if hasattr(element, equivalent):
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value = getattr(element, equivalent)
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else:
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return
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except:
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print(
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"Unable to find equivalent attribute of {} to migrate from {} to {}".format(
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attribute.name(), element, new_element
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)
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)
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return # We tried our best
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# print("Continuing migration of {} to migrate from {} to {}".format(attribute.name(), element, new_element))
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if value is None and not attribute.optional():
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value = self.generate_default_value(attribute, new_file)
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if value is None:
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print("Failed to generate default value for {} on {}".format(attribute.name(), element))
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elif isinstance(value, ifcopenshell.entity_instance):
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value = self.migrate(value, new_file)
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elif isinstance(value, (list, tuple)):
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if value and isinstance(value[0], ifcopenshell.entity_instance):
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new_value = []
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for item in value:
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new_value.append(self.migrate(item, new_file))
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value = new_value
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setattr(new_element, attribute.name(), value)
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def generate_default_value(self, attribute, new_file):
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if attribute.name() in self.default_values:
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return self.default_values[attribute.name()]
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elif self.default_entities[attribute.name()]:
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return self.default_entities[attribute.name()]
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elif attribute.name() == "OwnerHistory":
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self.default_entities[attribute.name()] = new_file.create_entity(
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"IfcOwnerHistory",
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**{
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"OwningUser": new_file.create_entity(
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"IfcPersonAndOrganization",
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**{
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"ThePerson": new_file.create_entity("IfcPerson"),
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"TheOrganization": new_file.create_entity(
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"IfcOrganization", **{"Name": "IfcOpenShell Migrator"}
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),
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}
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),
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"OwningApplication": new_file.create_entity(
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"IfcApplication",
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**{
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"ApplicationDeveloper": new_file.create_entity(
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"IfcOrganization", **{"Name": "IfcOpenShell Migrator"}
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),
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"Version": "Works for me",
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"ApplicationFullName": "IfcOpenShell Migrator",
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"ApplicationIdentifier": "IfcOpenShell Migrator",
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}
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),
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"ChangeAction": "NOCHANGE",
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"CreationDate": int(time.time()),
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}
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)
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return self.default_entities[attribute.name()]
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