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

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

@@ -0,0 +1,76 @@
+import ifcopenshell
+import ifcopenshell.util.date
+
+
+class Data:
+    is_loaded = False
+    products = {}
+    classifications = {}
+    references = {}
+    library_file = None
+    library_classifications = {}
+    library_references = {}
+
+    @classmethod
+    def purge(cls):
+        cls.is_loaded = False
+        cls.products = {}
+        cls.classifications = {}
+        cls.references = {}
+        cls.library_file = None
+        cls.library_classifications = {}
+        cls.library_references = {}
+
+    @classmethod
+    def load(cls, file, product_id=None):
+        cls._file = file
+        if not cls._file:
+            return
+        if product_id:
+            return cls.load_product_classifications(product_id)
+        cls.load_classifications()
+        cls.load_references()
+        cls.is_loaded = True
+
+    @classmethod
+    def load_product_classifications(cls, product_id):
+        product = cls._file.by_id(product_id)
+        cls.products[product_id] = []
+        if not product.HasAssociations:
+            return
+        for association in product.HasAssociations:
+            if association.is_a("IfcRelAssociatesClassification"):
+                cls.products[product_id].append(association.RelatingClassification.id())
+
+    @classmethod
+    def load_classifications(cls):
+        cls.classifications = {}
+        for classification in cls._file.by_type("IfcClassification"):
+            data = classification.get_info()
+            if cls._file.schema == "IFC2X3" and data["EditionDate"]:
+                data["EditionDate"] = ifcopenshell.util.date(data.EditionDate).isoformat()
+            cls.classifications[classification.id()] = data
+
+    @classmethod
+    def load_references(cls):
+        cls.references = {}
+        for reference in cls._file.by_type("IfcClassificationReference"):
+            data = reference.get_info()
+            if reference.ReferencedSource:
+                #data["ReferencedSource"] = cls.get_referenced_source(reference.ReferencedSource)
+                data["ReferencedSource"] = reference.ReferencedSource.id()
+            cls.references[reference.id()] = data
+
+    @classmethod
+    def get_referenced_source(cls, reference):
+        if reference.is_a("IfcClassification"):
+            return reference
+        elif reference.is_a("IfcClassificationReference") and reference.ReferencedSource:
+            return cls.get_referenced_source(reference.ReferencedSource)
+
+    @classmethod
+    def load_library(cls, filepath):
+        cls.library_file = ifcopenshell.open(filepath)
+        cls.library_classifications = {}
+        for classification in cls.library_file.by_type("IfcClassification"):
+            cls.library_classifications[classification.id()] = classification.Name