Re: [Jython-dev] Defining custom wrappers for Java classes / instances

[James A. <jam...@gm...>]

Hi Juerg,

Could you share a use case that requires this functionality?

Cheers,

James

On 12/02/07, Juerg Lehni <le...@gm...> wrote:
> Hi,
>
> I am new to Jython but have some experience with the Rhino JS engine
> for Java. With Rhino, it is possible to define custom wrappers for
> specific Java classes / instances through the definition of a
> WrapFactory. These wrappers then allow the definition of special
> behavior for certain classes. I am now wondering if there is a way of
> doing the same in Jython?
>
> I have looked at the code base a bit and figured out that the
> wrapping happens in Py.java2py(), which creates PyJavaInstances for
> native java objects. From looking at the code I assume that Jython
> does not offer the same flexibility as Rhino regarding wrapping, but
> that it probably would be quite straight forward to add it.
>
> In Rhino, I can use a custom WrapFactory to cache instance wrappers
> through the use of a WeakHashMap, instead of recreating a wrapper
> each time. This allows "unsealed" wrapper objects, which offer the
> possibility of treating native objects as dictionaries and adding
> values to them.
>
> I now wonder if many changes would be necessary to do the same in
> Jython?
>
> I am willing to work on this but would need some pointers first, as I
> have not worked with Jython at all so far.
>
> Thanks,
>
> Juerg
>
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