jython-users

[Jython-users] From Java To Jython

[rohit s. <ro2...@ya...>]

Hi,
I am using a Java application. Now I want to convert
some of the java classes to jython. I want to do it at
the minimum possible level. I mean that I want to do
the least possible changes in my existing code. But I
dont know how to build up that abstraction so that my
existing code does not need to know if I am using
A.class or A.py.
Like, for example, say there are classes A, B, C, D, E
and I add instances of A-E to a vector.
v.addElement(new A())etc...
also I am accessing some method of class A at some
point...say 
a=new A()
a.methodCall()
Now if I am implementing classes A-E in Jython, then
how can I neatly maintain the same code.
Can I still do v.addElement(A()) and still call some
method of A.py in my code without doing much changes?

Pl extend yr valuable help!!!!

Rohit


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Re: [Jython-users] From Java To Jython

[dman <ds...@ri...>]

On Tue, Oct 09, 2001 at 05:18:16AM -0700, rohit seth wrote:
| Hi,
| I am using a Java application. Now I want to convert
| some of the java classes to jython. I want to do it at
| the minimum possible level. I mean that I want to do
| the least possible changes in my existing code. But I
| dont know how to build up that abstraction so that my
| existing code does not need to know if I am using
| A.class or A.py.

This is possible, to some extent.  Take a look at the 'jythonc'
program that comes with jython.  This sort of thing only works as far
as Python's and Java's object/class model overlaps.  For example, you
can't create Java-static methods in a Python class, nor can you
(easily) access Python-module level data from Java.  You can, however,
have constructors and instance methods and the Java will never know it
is really invoking the Jython interpreter on some Python code.

HTH,
-D

Re: [Jython-users] From Java To Jython

[Ype K. <yk...@xs...>]

Rohit,

>Hi,
>I am using a Java application. Now I want to convert
>some of the java classes to jython. I want to do it at
>the minimum possible level. I mean that I want to do
>the least possible changes in my existing code. But I

In the best case you only have to make sure your java classes
are on the class path when you invoke jython, and then
you can use them directly in jython. No conversion needed.

>dont know how to build up that abstraction so that my
>existing code does not need to know if I am using
>A.class or A.py.
>Like, for example, say there are classes A, B, C, D, E
>and I add instances of A-E to a vector.
>v.addElement(new A())etc...

Like python, jython is not statically typed. You can use
anything at any place. You might get runtime errors,
but no compilation error (provided the syntax is correct.)

>also I am accessing some method of class A at some
>point...say
>a=new A()
>a.methodCall()
>Now if I am implementing classes A-E in Jython, then
>how can I neatly maintain the same code.
>Can I still do v.addElement(A()) and still call some
>method of A.py in my code without doing much changes?

Yes. In case you want to access jython classes from java code
have a look at:
http://www.jython.org/docs/jythonc.html

Have fun,
Ype