Re: [Jython-dev] Java methods on the proxies.

[Oti <oh...@ya...>]

[ Finn Bock ]

> Hi,
> 
> A couple of time users has asked for a way to make a dynamicly
> generated 
> proxy class more java like when the proxy is inspected with java 
> reflection. That is what jythonc's @sig feature does.
> 
> We can add something slightly similar to the dynamic proxy generator.
> In 
> the snippet below I have decorated the functions with a .sig
> attribute 
> that contains return type, a list of argument types and a list of 
> exception classes.
> 
> The decoration could also be some instance instead of a tuple or 
> something else entirely, but the decoration will *never* be in the
> form 
> if a textual @sig string in the doc string! Resolving the classnames
> in 
> the @sig string is way to magical to be used dynamicly. Adding new 
> syntax to the python language is also unacceptable.
> 
> I'm still undecided if doing something like this is a good idea at
> all.
> 
> regards,
> finn
> 
> 
> import junit
> from java import lang, util
> 
> class A(junit.framework.TestCase):
>      def __init__(self, name):
>          pass
>      def testAdd(self):
>          print "testAdd"
>      testAdd.sig = (lang.Void.TYPE, [], [])
> 
>      def testMul(self):
>          print "testMul"
>      testMul.sig = (lang.Void.TYPE, [], [])
> 
>      def myJavaMethod(self, a, b, c):
>          print a, b, c
>          return 5
>      myJavaMethod.sig = (lang.Integer.TYPE,
>                          [lang.String, lang.Integer, util.Date],
>                          [lang.Exception])
> 
> junit.textui.TestRunner.run(A)

Hello Finn,

i think this would be very useful !

Below is the 'test' for you if i understood it correctly:

Take an abstract java class with overloaded methods,
one of these overloaded methods being abstract.
Extend this class in Jython and implement the 'missing' method.
Then you are - currently - lucky if the appropriate method is being
called from Jython.

My feeling is that such a sig mechanism could be a great help calling
overloaded java methods - in general.

Best wishes,
Oti.

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