1 files changed, 69 insertions, 0 deletions
diff --git a/src/python/methodref.py b/src/python/methodref.py
new file mode 100644
index 0000000..f59ed24
--- /dev/null
+++ b/src/python/methodref.py
@@ -0,0 +1,69 @@
+# libavg - Media Playback Engine.
+# Copyright (C) 2003-2014 Ulrich von Zadow
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# Current versions can be found at www.libavg.de
+
+import weakref, new
+
+class methodref(object):
+    # From Python Cookbook
+    """ Wraps any callable, most importantly a bound method, in a way that allows a bound
+        method's object to be GC'ed, while providing the same interface as a normal weak
+        reference."""
+    def __init__(self, fn):
+        try:
+            # Try getting object, function and class
+            o, f, c = fn.im_self, fn.im_func, fn.im_class
+        except AttributeError:
+            # It's not a bound method
+            self._obj = None
+            self._func = fn
+            self._clas = None
+            if fn:
+                self.__name__ =  fn.__name__
+            else:
+                self.__name__ = None
+        else:
+            # Bound method
+            if o is None:        # ... actually UN-bound
+                self._obj = None
+                self.__name__ =  f.__name__
+            else:
+                self._obj = weakref.ref(o)
+                self.__name__ =  fn.im_class.__name__ + "." + fn.__name__
+            self._func = f
+            self._clas = c
+
+    def isSameFunc(self, func):
+        if self._obj is None:
+            return func == self._func
+        elif self._obj() is None:
+            return func is None
+        else:
+            try:
+                o, f, c = func.im_self, func.im_func, func.im_class
+            except AttributeError:
+                return False
+            else:
+                return (o == self._obj() and f == self._func and c == self._clas)
+
+    def __call__(self):
+        if self._obj is None:
+            return self._func
+        elif self._obj() is None:
+            return None
+        return new.instancemethod(self._func, self._obj(), self._clas)