get_dim_names and get_identifiers added in dataset

system/dataset.py

@@ -157,19 +157,25 @@ class Dataset:
             self.has_array = True
 
     def get_name(self):
+        """Returns dataset name"""
         return self._name
+
     def get_all_dims(self):
+        """Returns all dimensions in project"""
         return self._all_dims
 
-    def get_identifiers(self):
-        #return [n for n in self._map.iteritems()]
+    def get_dim_names(self):
+        """Returns dim names""" 
+        return [dim for dim in self._dims]
 
-        # ensure correct order
-        # this has correct dims but not identifiers
-        ids = []
-        for dim in self._dims:
-            ids.append((dim,self._map[dim].keys()))
-        return ids
+    def get_identifiers(self,dim):
+        """Returns identifiers aling dim, sorted by position (index)"""
+        items = self._map[dim].items()
+        backitems=[ [v[1],v[0]] for v in items]
+        backitems.sort()
+        sorted_ids=[ backitems[i][1] for i in range(0,len(backitems))]
+        return tuple(sorted_ids)
+     
 
 class CategoryDataset(Dataset):
     """The category dataset class.