Re: How to access objects from the script?

All good answers and I'd just add one little trick that wasn't discussed much. 
The issue of affecting references in JVM from inside a BeanShell script.  A
normal object reference one uses in an object or a method has the same
restrictions as far as mutating (can only touch public).  Generally speaking,
it's a much better idea to mutate objects' state via mutator methods as opposed
to public fields:

o.state = blah; // not recommended
o.setState(blah); // recommended

The reason for this is because a method can always be overriden to build in
some additional logic, such as firing events.  However, if, there is a need to
mutate a particular reference in memory one has to have some sort of wrapper. 
In the example above, o is acting as a wrapper for its state reference.  But,
as I said, what if there's no class for this o wrapper?  One can use a length-1
array as a reference wrapper:

Object[] refWrap = new Object[1];
refWrap[0] = blah;
Interpreter i = new Interpreter();
i.set("refWrap", refWrap);
// now we can execute something in BSH and it'll 
// have a chance to modify refWrap[0], which will 
// take effect outside the BSH environment as well

--- Brian Hawkins <brianhks-BYHubErIwDGZvNlLnfxc/[email protected]> wrote:

> This is how I've done it.
> 
> I call set on the interpreter class to set an object into the 
> environment like so
> m_interpreter.set("bshargs", args);
> 
> This sets args as the variable "bshargs" (this name can be anything);
> 
> Then I call
> 
> m_interpreter.eval("on_start(bshargs)");
> 
> This calls the "on_start" method and passes the bshargs variable that I 
> set earlier.  The object passed in can be any real or script object.
> 
> Brian
> 
> Philip Cammin wrote:
> 
> > Hello!
> >
> > I would like to call different methods which are written in a 
> > beanscript file at certain points in my application. For example i do 
> > call the method "on_start()" in the "public static void main(String 
> > args[])" method of my application. And i, ofcourse can give the method 
> > strings and integers, but i did not find an example to give the 
> > method, a reference to an object. Also i did not find out how to 
> > modfiy objects or variable which are in the real java code from the 
> > script, if i only had the reference to it.
> >
> > I just want to offer the oppertunity for the users to get or set data 
> > in the program at different points, i do not want to to script the 
> > whole classes.
> >
> > Thank you!
> >
> >
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> 


Alexey
2001 Honda CBR600F4i (CCS)
1992 Kawasaki EX500
http://bsheet.sourceforge.net

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This SF.Net email is sponsored by xPML, a groundbreaking scripting language
that extends applications into web and mobile media. Attend the live webcast
and join the prime developer group breaking into this new coding territory!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642