Hi,
Well, I'm not 100% sure what you're trying to do. 'paolo' is an
instance of jess.Value or a subclass thereof, so
the println will print "jess.Value", "jess.Variable", or
"jess.FuncallValue", and you're probably not expecting that.
Note, by the way, that you evaluate the paolo object twice, once when
you call externalAddressValue and once when you call stringValue();
this might be bad if paolo is a FuncallValue, since then you'll
execute this function twice. To avoid this, make the first line read
Value paolo = vv.get(1).resolveValue(context);
(See Jess manual section 4.2.2.)
I'm also not sure what you want the stringValue() call to do. It looks
like you believe paolo should contain an AttuazioneBean object as an
EXTERNAL_ADDRESS. It cannot also contain a String! Maybe you expect
toString() to be called automatically? It will not be.
Because the function is called fact-out-2, and because it's returning
a String, perhaps you want a String rendering of the shadow fact that
represents this object? Jess doesn't provide any easy way to get such
a thing, at least, not that I can think of right now. Roughly, you
could do something like
String getStringFormOfShadowFact(Object o)
{
for (Enumeration e = rete.listFacts(); e.hasMoreElements();)
{
Fact f = (Fact) e.nextElement();
if (f.isShadow() && f.getSlotValue("OBJECT") == o)
return f.toStringWithParens();
}
// Not found, throw an exception or something.
}
I think Alessandro Saporiti wrote:
> Hi,
> I have write the following java code , but this function don't work!
> I'm missing somethings?
>
> import jess.*;
>
> public class FactOut2 implements Userfunction
> {
> public String getName() { return "fact-out-2"; }
> public Value call(ValueVector vv, Context context) throws JessException
> {
> Value paolo = vv.get(1);
> AttuazioneBean AttuazioneObject = (AttuazioneBean)
> paolo.externalAddressValue(context);
> System.out.println("Bean object :" + paolo.getClass().getName() );
> return new Value (vv.get(1).stringValue(context), RU.STRING);
>
> }
> }
>
> Thank in advance.
> Alessandro
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9012 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
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