1"""
2Objective-C runtime wrapper for use by LLDB Python formatters
3
4part of The LLVM Compiler Infrastructure
5This file is distributed under the University of Illinois Open Source
6License. See LICENSE.TXT for details.
7"""
8class AttributesDictionary:
9	def __init__(self, allow_reset = True):
10		self.__dict__['_dictionary'] = {} # need to do it this way to prevent endless recursion
11		self.__dict__['_allow_reset'] = allow_reset
12
13	def __getattr__(self,name):
14		if not self._check_exists(name):
15			return None
16		value = self._dictionary[name]
17		return value
18
19	def _set_impl(self,name,value):
20		self._dictionary[name] = value
21
22	def _check_exists(self,name):
23		return name in self._dictionary
24
25	def __setattr__(self,name,value):
26		if self._allow_reset:
27			self._set_impl(name,value)
28		else:
29			self.set_if_necessary(name,value)
30
31	def set_if_necessary(self,name,value):
32		if not self._check_exists(name):
33			self._set_impl(name,value)
34			return True
35		return False
36
37	def __len__(self):
38		return len(self._dictionary)