Thanks Ernest,
My vote would be to return the wrapper - it just seems more intuitive to me
to get the external address to the Java object itself.
It seems to me this behavior was not apparent before Jess 5 - is that
correct?
ML
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]
Sent: Thursday, October 19, 2000 1:04 PM
To: Lucero, Michael
Cc: '[EMAIL PROTECTED]'
Subject: Re: JESS: Java to Jess type conversion
Hi Michael,
I can confirm this behaviour in Jess 6, too. It's actually not just
field access, but method return values too -- i.e., the return value
of a method returning Integer would be similarly converted.
It is arguably incorrect for this conversion to be done at all; I'm
not sure what I was thinking when I defined it this way. I believe the
current behaviour was influenced by user comments on the behviour of
Java Strings. Several people expressed the opinion that a method
returning String should return a Jess string when called from Jess,
not an external address with a Java String in it.
Let me throw this one out for comment. If you call a method or fetch a
field of type Integer (or Float, or Double, or Boolean) should it
return the primitive type in Jess, as it does now, or should it return
the wrapper object? What do people think?
I think Lucero, Michael wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> Using Jess 5.1:
>
> if I have a class like this:
>
> public class A
> {
> public final static Object VAR = new Integer(1);
>
> public void setValueById(Object id)
> {
> m_val = id;
> }
>
> private Object m_val,
> }
>
> and rules (forgive syntax errors):
>
> (defclass classA A)
>
> (defRule varTest
> (classA (OBJECT ?o))
> =>
> (call ?o setValueById (get-member A VAR))
> )
>
> I get an exception when the rule fires:
> Message: No overloading of method 'setValueById' in class A I can call
> with these arguments: (call ?o setValueById (get-member A VAR)).
>
> I think the problem here is that 'get-member' does not return an external
> address, but has translated it to a Jess Integer type.
>
> Is this expected, and, if so, is there a way to prevent that automatic
> translation.
>
> Thanks in advance
>
> Michael Lucero
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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
Livermore, CA 94550
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