Implement metric constraints in the ifcopenshell.api

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

@@ -7,12 +7,17 @@ class Data:
     is_loaded = False
     products = {}
     objectives = {}
+    metrics = {}
+    references = {}
 
     @classmethod
     def purge(cls):
         cls.is_loaded = False
         cls.products = {}
         cls.objectives = {}
+        cls.metrics ={}
+        cls.references = {}
+
 
     @classmethod
     def load(cls, file, product_id=None):
@@ -22,6 +27,8 @@ class Data:
         if product_id:
             return cls.load_product(product_id)
         cls.load_objectives()
+        cls.load_metrics()
+        cls.load_references()
         cls.is_loaded = True
 
     @classmethod
@@ -41,8 +48,41 @@ class Data:
         cls.objectives = {}
         for constraint in cls._file.by_type("IfcObjective"):
             data = constraint.get_info()
+            for key, value in data.items():
+                if not value:
+                    continue
+
             if cls._file.schema == "IFC2X3":
                 for attribute in ["CreationTime"]:
                     if data[attribute]:
                         data[attribute] = ifcopenshell.util.date.ifc2datetime(data[attribute]).isoformat()
+            data["BenchmarkValues"] = [metric.id() for metric in constraint.BenchmarkValues or []]
             cls.objectives[constraint.id()] = data
+
+    @classmethod
+    def load_metrics(cls):
+        cls.metrics = {}
+        for metric in cls._file.by_type("IfcMetric"):
+            data = metric.get_info()
+            for key, value in data.items():
+                if not value:
+                    continue
+            data["ConstrainedObjects"] = []
+            for association in cls._file.by_type("IfcRelAssociatesConstraint"):
+                if association.RelatingConstraint.id() == metric.id():
+                    data["ConstrainedObjects"] = [o.id() for o in association.RelatedObjects or []]
+            if metric.DataValue:
+                data["DataValue"] = data["DataValue"].id()
+            if metric.ReferencePath:
+                data["ReferencePath"] = data["ReferencePath"].id()
+            cls.metrics[metric.id()] = data
+
+    @classmethod
+    def load_references(cls):
+        cls.references = {}
+        for reference in cls._file.by_type("IfcReference"):
+            data = reference.get_info()
+            for key, value in data.items():
+                if not value:
+                    continue
+            cls.references[refenrece.id()] = data