Convert the validity functions to class functions to allow them to be used in __new__ methods.

volatility/framework/validity.py

@@ -8,7 +8,8 @@ Created on 4 May 2013
 class ValidityRoutines(object):
     """Class to hold all validation routines, such as type checking"""
 
-    def _check_type(self, value, valid_type):
+    @classmethod
+    def _check_type(cls, value, valid_type):
         """Checks that value is an instance of valid_type, and returns value if it is, or throws a TypeError otherwise
 
         :param value: The value of which to validate the type
@@ -17,11 +18,12 @@ class ValidityRoutines(object):
         :type valid_type: type
         """
         assert isinstance(value,
-                          valid_type), self.__class__.__name__ + " expected " + valid_type.__name__ + ", not " + type(
+                          valid_type), cls.__name__ + " expected " + valid_type.__name__ + ", not " + type(
             value).__name__
         return value
 
-    def _check_class(self, klass, valid_class):
+    @classmethod
+    def _check_class(cls, klass, valid_class):
         """Checks that class is an instance of valid_class, and returns klass if it is, or throws a TypeError otherwise
 
         :param klass: Class to validate
@@ -30,5 +32,5 @@ class ValidityRoutines(object):
         :type valid_class: class
         """
         assert issubclass(klass,
-                          valid_class), self.__class__.__name__ + " expected " + valid_class.__name__ + ", not " + klass.__name__
+                          valid_class), cls.__name__ + " expected " + valid_class.__name__ + ", not " + klass.__name__
         return klass