1 files changed, 41 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/BaseTools/Source/Python/Common/caching.py b/src/VBox/Devices/EFI/Firmware/BaseTools/Source/Python/Common/caching.py
new file mode 100755
index 00000000..681740c1
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/BaseTools/Source/Python/Common/caching.py
@@ -0,0 +1,41 @@
+## @file
+# help with caching in BaseTools
+#
+# Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+
+## Import Modules
+#
+
+# for class function
+class cached_class_function(object):
+    def __init__(self, function):
+        self._function = function
+    def __get__(self, obj, cls):
+        def CallMeHere(*args,**kwargs):
+            Value = self._function(obj, *args,**kwargs)
+            obj.__dict__[self._function.__name__] = lambda *args,**kwargs:Value
+            return Value
+        return CallMeHere
+
+# for class property
+class cached_property(object):
+    def __init__(self, function):
+        self._function = function
+    def __get__(self, obj, cls):
+        Value = obj.__dict__[self._function.__name__] = self._function(obj)
+        return Value
+
+# for non-class function
+class cached_basic_function(object):
+    def __init__(self, function):
+        self._function = function
+    # wrapper to call _do since <class>.__dict__ doesn't support changing __call__
+    def __call__(self,*args,**kwargs):
+        return self._do(*args,**kwargs)
+    def _do(self,*args,**kwargs):
+        Value = self._function(*args,**kwargs)
+        self.__dict__['_do'] = lambda self,*args,**kwargs:Value
+        return Value