First attempt at ripping out agnostic code into ifcopenshell.api namespace. See #1399.

src/ifcopenshell-python/ifcopenshell/api/attribute/data.py

@@ -0,0 +1,48 @@
+import ifcopenshell
+import ifcopenshell.util.attribute
+
+
+class Data:
+    products = {}
+
+    @classmethod
+    def purge(cls):
+        cls.products = {}
+
+    @classmethod
+    def load(cls, file, product_id):
+        if not file:
+            return
+        product = file.by_id(product_id)
+        schema = ifcopenshell.ifcopenshell_wrapper.schema_by_name(file.schema)
+        cls.products[product_id] = []
+        declaration = schema.declaration_by_name(product.is_a())
+        for attribute in declaration.all_attributes():
+            data_type = ifcopenshell.util.attribute.get_primitive_type(attribute)
+            value = getattr(product, attribute.name())
+            list_type = None
+            enum_items = ()
+
+            if isinstance(data_type, tuple):
+                list_type = data_type[1]
+                data_type = data_type[0]
+
+            if data_type in ["entity", "list", "string", "enum"]:
+                value = None if value is None else str(value)
+            elif data_type == "float":
+                value = None if value is None else float(value)
+            elif data_type == "integer":
+                value = None if value is None else int(value)
+
+            if data_type == "enum":
+                enum_items = ifcopenshell.util.attribute.get_enum_items(attribute)
+
+            cls.products[product_id].append({
+                "name": attribute.name(),
+                "value": value,
+                "type": data_type,
+                "enum_items": enum_items,
+                "list_type": list_type,
+                "is_optional": attribute.optional(),
+                "is_null": getattr(product, attribute.name()) is None
+            })

src/ifcopenshell-python/ifcopenshell/api/attribute/edit_attributes.py

@@ -0,0 +1,18 @@
+from ifcopenshell.api.owner.api import update_owner_history
+
+
+class Usecase():
+    def __init__(self, file, settings=None):
+        self.file = file
+        self.settings = {
+            "product": None,
+            "attributes": {}
+        }
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        for name, value in self.settings["attributes"].items():
+            setattr(self.settings["product"], name, value)
+        if hasattr(self.settings["product"], "OwnerHistory"):
+            update_owner_history(self.settings["product"])