From b78a398514967548027805fbb77163c3b94cd4f7 Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Sat, 7 Mar 2009 02:41:39 +0000
Subject: Simplify LazyItemsDict internals.

svn path=/main/trunk/; revision=12773
---
 pym/portage/util.py | 57 ++++++++++++++++++++++++++++-------------------------
 1 file changed, 30 insertions(+), 27 deletions(-)

diff --git a/pym/portage/util.py b/pym/portage/util.py
index 98a01c791..c84f351be 100644
--- a/pym/portage/util.py
+++ b/pym/portage/util.py
@@ -1071,19 +1071,18 @@ class LazyItemsDict(dict):
 	def addLazyItem(self, item_key, value_callable, *pargs, **kwargs):
 		"""Add a lazy item for the given key.  When the item is requested,
 		value_callable will be called with *pargs and **kwargs arguments."""
-		if not pargs:
-			pargs = None
-		if not kwargs:
-			kwargs = None
-		self.lazy_items[item_key] = (value_callable, pargs, kwargs)
+		self.lazy_items[item_key] = \
+			self._LazyItem(value_callable, pargs, kwargs, False)
 		# make it show up in self.keys(), etc...
 		dict.__setitem__(self, item_key, None)
+
 	def addLazySingleton(self, item_key, value_callable, *pargs, **kwargs):
 		"""This is like addLazyItem except value_callable will only be called
 		a maximum of 1 time and the result will be cached for future requests."""
-		self.addLazyItem(item_key,
-			self._SingletonWrapper(self, item_key, value_callable),
-				*pargs, **kwargs)
+		self.lazy_items[item_key] = \
+			self._LazyItem(value_callable, pargs, kwargs, True)
+		# make it show up in self.keys(), etc...
+		dict.__setitem__(self, item_key, None)
 
 	def update(self, *args, **kwargs):
 		if len(args) > 1:
@@ -1102,12 +1101,7 @@ class LazyItemsDict(dict):
 					dict.__setitem__(self, k, None)
 				else:
 					dict.__setitem__(self, k, map_obj[k])
-			for k, v in map_obj.lazy_items.iteritems():
-				if isinstance(v[0], self._SingletonWrapper):
-					# Create a new wrapper that references self.
-					v = (self._SingletonWrapper(self, k, v[0]._callable),
-						v[1], v[2])
-				self.lazy_items[k] = v
+			self.lazy_items.update(map_obj.lazy_items)
 		else:
 			dict.update(self, map_obj)
 		if kwargs:
@@ -1115,14 +1109,21 @@ class LazyItemsDict(dict):
 
 	def __getitem__(self, item_key):
 		if item_key in self.lazy_items:
-			value_callable, pargs, kwargs = self.lazy_items[item_key]
+			lazy_item = self.lazy_items[item_key]
+			pargs = lazy_item.pargs
 			if pargs is None:
 				pargs = ()
+			kwargs = lazy_item.kwargs
 			if kwargs is None:
 				kwargs = {}
-			return value_callable(*pargs, **kwargs)
+			result = lazy_item.func(*pargs, **kwargs)
+			if lazy_item.singleton:
+				self[item_key] = result
+			return result
+
 		else:
 			return dict.__getitem__(self, item_key)
+
 	def __setitem__(self, item_key, value):
 		if item_key in self.lazy_items:
 			del self.lazy_items[item_key]
@@ -1176,7 +1177,7 @@ class LazyItemsDict(dict):
 				except TypeError:
 					# If deepcopy fails for a lazy singleton, try to
 					# evaluate the singleton and deepcopy the result.
-					if not isinstance(lazy_item[0], self._SingletonWrapper):
+					if not lazy_item.singleton:
 						raise
 					dict.__setitem__(result, k_copy, deepcopy(self[k], memo))
 				else:
@@ -1185,19 +1186,21 @@ class LazyItemsDict(dict):
 				dict.__setitem__(result, k_copy, deepcopy(self[k], memo))
 		return result
 
-	class _SingletonWrapper(object):
+	class _LazyItem(object):
+
+		__slots__ = ('func', 'pargs', 'kwargs', 'singleton')
 
-		__slots__ = ('_parent', '_key', '_callable')
+		def __init__(self, func, pargs, kwargs, singleton):
 
-		def __init__(self, parent, key, value_callable):
-			self._parent = parent
-			self._key = key
-			self._callable = value_callable
+			if not pargs:
+				pargs = None
+			if not kwargs:
+				kwargs = None
 
-		def __call__(self, *pargs, **kwargs):
-			value = self._callable(*pargs, **kwargs)
-			self._parent[self._key] = value
-			return value
+			self.func = func
+			self.pargs = pargs
+			self.kwargs = kwargs
+			self.singleton = singleton
 
 class ConfigProtect(object):
 	def __init__(self, myroot, protect_list, mask_list):
-- 
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