1 files changed, 98 insertions, 0 deletions
diff --git a/lib/portage/proxy/objectproxy.py b/lib/portage/proxy/objectproxy.py
new file mode 100644
index 000000000..a755774ae
--- /dev/null
+++ b/lib/portage/proxy/objectproxy.py
@@ -0,0 +1,98 @@
+# Copyright 2008-2012 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+import sys
+
+__all__ = ['ObjectProxy']
+
+class ObjectProxy(object):
+
+	"""
+	Object that acts as a proxy to another object, forwarding
+	attribute accesses and method calls. This can be useful
+	for implementing lazy initialization.
+	"""
+
+	__slots__ = ()
+
+	def _get_target(self):
+		raise NotImplementedError(self)
+
+	def __getattribute__(self, attr):
+		result = object.__getattribute__(self, '_get_target')()
+		return getattr(result, attr)
+
+	def __setattr__(self, attr, value):
+		result = object.__getattribute__(self, '_get_target')()
+		setattr(result, attr, value)
+
+	def __call__(self, *args, **kwargs):
+		result = object.__getattribute__(self, '_get_target')()
+		return result(*args, **kwargs)
+
+	def __enter__(self):
+		return object.__getattribute__(self, '_get_target')().__enter__()
+
+	def __exit__(self, exc_type, exc_value, traceback):
+		return object.__getattribute__(self, '_get_target')().__exit__(
+			exc_type, exc_value, traceback)
+
+	def __setitem__(self, key, value):
+		object.__getattribute__(self, '_get_target')()[key] = value
+
+	def __getitem__(self, key):
+		return object.__getattribute__(self, '_get_target')()[key]
+
+	def __delitem__(self, key):
+		del object.__getattribute__(self, '_get_target')()[key]
+
+	def __contains__(self, key):
+		return key in object.__getattribute__(self, '_get_target')()
+
+	def __iter__(self):
+		return iter(object.__getattribute__(self, '_get_target')())
+
+	def __len__(self):
+		return len(object.__getattribute__(self, '_get_target')())
+
+	def __repr__(self):
+		return repr(object.__getattribute__(self, '_get_target')())
+
+	def __str__(self):
+		return str(object.__getattribute__(self, '_get_target')())
+
+	def __add__(self, other):
+		return self.__str__() + other
+
+	def __hash__(self):
+		return hash(object.__getattribute__(self, '_get_target')())
+
+	def __ge__(self, other):
+		return object.__getattribute__(self, '_get_target')() >= other
+
+	def __gt__(self, other):
+		return object.__getattribute__(self, '_get_target')() > other
+
+	def __le__(self, other):
+		return object.__getattribute__(self, '_get_target')() <= other
+
+	def __lt__(self, other):
+		return object.__getattribute__(self, '_get_target')() < other
+
+	def __eq__(self, other):
+		return object.__getattribute__(self, '_get_target')() == other
+
+	def __ne__(self, other):
+		return object.__getattribute__(self, '_get_target')() != other
+
+	def __bool__(self):
+		return bool(object.__getattribute__(self, '_get_target')())
+
+	if sys.hexversion < 0x3000000:
+		__nonzero__ = __bool__
+
+		def __unicode__(self):
+			return unicode(object.__getattribute__(self, '_get_target')())
+
+	def __int__(self):
+		return int(object.__getattribute__(self, '_get_target')())