* Committing all dirty work to CVS. We are migrating to GIT.

Beware: changes in this commit may or may not work properly.

py/wrapper.py

@@ -0,0 +1,57 @@
+# $Id: wrapper.py,v 1.1 2011-10-06 19:15:05 wirawan Exp $
+#
+# wpylib.py.wrapper module
+# Created: 20110608
+# Wirawan Purwanto
+#
+# Wrapper base class.
+# Used for automatic wrapping of (especially) methods to
+# dispatch it to a host of object possibilities.
+#
+
+
+class wrapper_base(object):
+  """Wrapper or proxy object to provide uniform API to other routines,
+  etc.
+
+  This class allows dirty tricks such as injecting external functions
+  to accomplish certain required tasks in object-oriented manner.
+  If using external procedure, it must be callable with "self" as
+  its first argument.
+
+  Reserved attributes:
+  * _obj_ = the wrapped object
+  * _procnames_[:] = method names to wrap automatically.
+  * _obj_path_[:] = list of objects (instances) from which to look
+    for the methods.
+  * _set_obj_path_() = object method to define what objects to be
+    included in the object path (_obj_path_).
+
+  """
+  def __init__(self, obj):
+    """Creates a wrapper."""
+    self._obj_ = obj
+    if hasattr(self, '_set_obj_path_'):
+      self._set_obj_path_()
+    else:
+      self._obj_path_ = [ obj ]
+
+  def _autoset_proc_(self, procname, extproc=None):
+    from wpylib.py import make_unbound_method
+    from wpylib.py.im_weakref import im_ref
+    from weakref import ref
+
+    procname_ = procname + '_'
+    procname_proc = procname + '_proc'
+    if hasattr(self, procname_proc):
+      # In case the derived-class has the procedure, we will use
+      # that.
+      setattr(self, procname, im_ref(getattr(self, procname_proc)))
+    else:
+      for o in self._obj_path_:
+        if hasattr(o, procname):
+          setattr(self, procname, im_ref(getattr(o, procname)))
+          return
+      # May implement a global fallback hook here?
+      pass
+