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