[Jython-users] creating a PyFunction

[Nick C. <ni...@sr...>]

Hi,

I'm trying to use Jython as a scripting language within an ide. The
ide is for developing simulations with a Java framework, and the
scripting is for scripting simulation behavoir (not ide behavoir). 

Ideally, I'd want the user to define a Java class through the ide and
have the behavoir of such a class defined in python. Of course,
there's lots of wrapping etc. going on here, but I'm thinking of
generating bytecode whose source code would look something like 
the following:

public class MyAgent {

  private PyFunction step;
  private int wealth = 0;


  public void step() {
    step.__call(...);
  }
}

where the PyFunction step has the wealth ivar available to it. 

The PyFunction would be the result of compiling whatever the user entered
into the ide, for example:

if wealth > 3:
   do_something()
else:
   do_something_else()


My question then is, is this possible? And if so, how do I create a 
PyFunction object and ensure that its namespace / calling frame contains
the appropriate mappings - so that in the above example the PyFunction
has the current value for wealth. 

Alternatively, I suppose I could treat the Java class as a
proxy for a PyClass, so that any calls on the Java class are forwarded
to the PyClass so:

public void setWealth(int val) {
  target.__setattr__("wealth", new PyInteger(val));
}

Perhaps the PyClass should be a PyInstance here though.

At any rate, the question remains given some jython source code how
can I get a PyFunction, PyClass, or PyInstance from within a 
Java application.

thanks very much,

Nick

ps. If this is all woefully wrong-headed, any suggestions would
be appreciated.

n.


-- 
Nick Collier
Social Science Research Computing
University of Chicago
http://repast.sourceforge.net