Added a cache on getPreference

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4370 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/PreferenceTool.py

@@ -26,7 +26,7 @@
 #
 ##############################################################################
 
-from AccessControl import ClassSecurityInfo
+from AccessControl import ClassSecurityInfo, getSecurityManager
 from Globals import InitializeClass, DTMLFile
 from Acquisition import aq_base
 
@@ -83,10 +83,12 @@ class PreferenceTool(BaseTool):
   security.declareProtected(Permissions.View, "getPreference")
   def getPreference(self, pref_name) :
     """ get the preference on the most appopriate Preference object. """
+    def _getPreference(self, pref_name="", user_name="") :
       found = 0
+      MARKER = []
       for pref in self._getMostAppropriatePreferences() :
-      attr = getattr(pref, pref_name, None)
-      if attr is not None :
+        attr = getattr(pref, pref_name, MARKER)
+        if attr is not MARKER :
           found = 1
           # test the attr is set
           if callable(attr) :
@@ -97,6 +99,10 @@ class PreferenceTool(BaseTool):
             return attr
       if found :
         return attr
+    _getPreference = CachingMethod( _getPreference,
+                                  id='PreferenceTool.CachingMethod')
+    user_name = getSecurityManager().getUser().getId()
+    return _getPreference(self, pref_name=pref_name, user_name=user_name)
   
   security.declareProtected(Permissions.ModifyPortalContent, "setPreference")
   def setPreference(self, pref_name, value) :