1 files changed, 47 insertions, 0 deletions
diff --git a/BaseTools/Source/Python/Common/caching.py b/BaseTools/Source/Python/Common/caching.py
new file mode 100644
index 0000000000..7cb4586d31
--- /dev/null
+++ b/BaseTools/Source/Python/Common/caching.py
@@ -0,0 +1,47 @@
+## @file
+# help with caching in BaseTools
+#
+# Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+
+## 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