tcljava-user

[tcljava-user] JACL Script inside EJB

[Sai G. M N <Sai...@pl...>]

Hi

I am trying to run a JACL script inside an EJB (Enterprise JavaBean). I pass
the name of the script as an input paramater. Then the EJB reads that file
and runs it using the Interp.evalFile Command. So Far, so good
However, I want to be able to pass a Java Object (or may be a TclObject) to
that script and the script should work on that object. Basically, the object
would contain name-value pairs, which are the arguments for the script to
work on.
1. Is this kind of a scenario implementable in JACL?
2. If so, will any JACL script be able to understand Java Collection Objects
or should I convert them into TclObjects? Is this possible and how?
3. Once I convert it to a TclObject, how do I make the JACL script access
this object? CAn I pass it as a parameter to the script?

Or is there some other way approaching the above mentioned problem?
Would really appreciate any kind of inputs that can be given on the above
subject. 

Thanks
Sai Geetha

Re: [tcljava-user] JACL Script inside EJB

[Mo D. <md...@cy...>]

On Wed, 8 Nov 2000, Sai Geetha M N wrote:

> Hi
> 
> I am trying to run a JACL script inside an EJB (Enterprise JavaBean). I pass
> the name of the script as an input paramater. Then the EJB reads that file
> and runs it using the Interp.evalFile Command. So Far, so good
> However, I want to be able to pass a Java Object (or may be a TclObject) to
> that script and the script should work on that object. Basically, the object
> would contain name-value pairs, which are the arguments for the script to
> work on.

It sounds like you want to take some Java info and wrap it up
in a TclList. You would then set a variable in Tcl to this
TclList.

> 1. Is this kind of a scenario implementable in JACL?

Sure.

> 2. If so, will any JACL script be able to understand Java Collection Objects
> or should I convert them into TclObjects? Is this possible and how?

You would want to take the data out of a Java vector and put it
into a TclList. You Java code would just allocate a TclList object
and then loop over the Java elements adding them to the TclList.

Something like (this is just off the top of my head):

TclObject to = TclList.newInstance()
Vector v = ...

while (! done) {
 TclObject str = TclList.newInstance((String) v.elementAt(i) );
 TclList.append(interp, list, str);
}

> 3. Once I convert it to a TclObject, how do I make the JACL script access
> this object? CAn I pass it as a parameter to the script?

Set a variable in the interp. See the interp.setVar() command docs.
These docs live in tcljava/docs/TclJavaLib.

It seems clear that we need better "getting started" documentation.
Would you be willing to take notes as you learn this stuff and
help with a short tutorial later?

Mo DeJong
Red Hat Inc