X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=sfa%2Frspecs%2Felements%2Felement.py;h=7dcfa007a994370cc0076eb76ac0a047ab80a4d3;hb=4a9e6751f9f396f463932133b9d62fc925a99ef6;hp=6757f8a8c25070d56808c92c13b8ba3b6fe5d074;hpb=e494b36a8d4b0924e8591d52662450c32a20615d;p=sfa.git

diff --git a/sfa/rspecs/elements/element.py b/sfa/rspecs/elements/element.py
index 6757f8a8..7dcfa007 100644
--- a/sfa/rspecs/elements/element.py
+++ b/sfa/rspecs/elements/element.py
@@ -2,8 +2,22 @@ class Element(dict):
 
     fields = {}
 
-    def __init__(self, fields={}, element=None):
+    def __init__(self, fields=None, element=None, keys=None):
+        if fields is None:
+            fields = {}
         self.element = element
-        dict.__init__(self, self.fields) 
-        self.update(fields)
+        dict.__init__(self, dict.fromkeys(self.fields))
+        if not keys:
+            keys = list(fields.keys())
+        for key in keys:
+            if key in fields:
+                self[key] = fields[key]
 
+    def __getattr__(self, name):
+        if hasattr(self.__dict__, name):
+            return getattr(self.__dict__, name)
+        elif hasattr(self.element, name):
+            return getattr(self.element, name)
+        else:
+            raise AttributeError("class Element of type {} has no attribute {}"
+                                 .format(self.__class__.__name__, name))