[Jython-bugs] [ jython-Bugs-600790 ] Overriding automatically defined methods

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Bugs item #600790, was opened at 2002-08-27 13:39
Message generated for change (Comment added) made by leouserz
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Category: None
Group: Deferred
Status: Open
Resolution: None
Priority: 4
Private: No
Submitted By: Rich Landers (rt_landers)
Assigned to: Nobody/Anonymous (nobody)
Summary: Overriding automatically defined methods

Initial Comment:
When subclassing a java.util.List in Jython
and I want to override __setitem__ to accept either
a symbolic name or an integer index. However, when
I define the __setitem__ method in my Jython subtype, I 
get a "TypeError: only integer keys accepted"
exception.  It seems that since __setitem__ was defined
*automatically* for the List, my overriding method is 
never being called...

--------

 from java.lang import String
 from java.util import ArrayList
 
 class GoofyListMapThing (ArrayList):
 
     def __init__(self):
         self._elements = {}

     def __setitem__(self, key, element):
         print "GoofyListMapThing::__setitem__"
         # Handle string key or int key here...
 
     def __getitem__(self, key):
         print "GoofyListMapThing::__getitem__"
         # Handle string key or int key here...
 
 glmt = GoofyListMapThing()
 glmt["my-key"] = String("Element-1")    # fails!
 

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Comment By: leouser (leouserz)
Date: 2006-12-21 19:23

Message:
Logged In: YES 
user_id=1277399
Originator: NO

This problem is caused by PyInstance always checking if it has a
CollectionProxy(non-collection subclasses appear not to be affected).  If
so it executes the CollectionProxies __setitem__(there are others, look for
usage of getCollection() in PyInstance).  A possible patch is to check the
various dictionaries before checking for a collection proxy and executing
the returned function if there is one.

__findattr__ appears not to work, so the individual dictionaries may have
to queried.

leouser

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