# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1319151639 -7200
# Node ID 1f2350a0b007a0a7a75ea487c0f23f3257b5490b
# Parent  90f4bcc889524fd9bb979c9daa29089a45c6af10
Added caching of attribute-related table lookups, reducing memory consumption
and improving performance substantially.

diff -r 90f4bcc88952 -r 1f2350a0b007 micropython/table.py
--- a/micropython/table.py	Fri Oct 21 00:59:47 2011 +0200
+++ b/micropython/table.py	Fri Oct 21 01:00:39 2011 +0200
@@ -213,6 +213,8 @@
         self.names = []
         self.displaced_list = None
         self.raw = None
+        self.all_cache = {}
+        self.any_cache = {}
 
     def access(self, objname, attrname):
 
@@ -426,7 +428,10 @@
         returned.
         """
 
-        return self._objects_plus_status(names, self.all_possible_objects)
+        names = tuple(names)
+        if not self.all_cache.has_key(names):
+            self.all_cache[names] = self._objects_plus_status(names, self.all_possible_objects)
+        return self.all_cache[names]
 
     def any_possible_objects_plus_status(self, names):
 
@@ -437,7 +442,10 @@
         returned.
         """
 
-        return self._objects_plus_status(names, self.any_possible_objects)
+        names = tuple(names)
+        if not self.any_cache.has_key(names):
+            self.any_cache[names] = self._objects_plus_status(names, self.any_possible_objects)
+        return self.any_cache[names]
 
 class ParameterTable(Table):