The 'if' statement you've written looks as if it should be OK, but
it's rather a dark corner of language syntax, and there may indeed be
a bug there. Did you try the equivalent, but probably functional
(if (eq ?myVar 0) then (bind $?arrayToUse $?arrayA)
else (bind $?arrayToUse $?arrayB))
I'll have a look at why the other form is broken.
I think Kenny Macleod wrote:
>
> Folks,
>
> I think I may have run into a possible bug in Jess 4.4. On the other
> hand, I could just be doing something daft and not realising it.
>
> I am trying to invoke the (call) function on a Java static method. This
> method takes a single argument, an array of bytes.
>
> In the rules, this argument can be one of two pre-defined multivariable
> values, call them $?arrayA and $?arrayB. Now, I can call the method
> using the following syntax:
>
> (call mypackage.myclass mymethod $?arrayA)
>
> That works fine. However, I want to select the argument to pass
> depending on the value of another variable, call it ?myvar:
>
> (bind $?arrayToUse (if (eq ?myvar 0) then $?arrayA else
> $?arrayB))
> (call mypackage.myclass mymethod $?arrayToUse)
>
> When I try it this way, I get a Rete exception ("method mymethod not
> found or invalid argument types").
>
> Am I using the multivariable values correctly, or is the 'if' statement
> returning values of the wrong type here? After further poking around,
> it seems that the $?arrayToUse variable is of type RU.MULTIFIELD. The
> ReteException, however, is being thrown from within
> Jess.Value.listValue(), which only accepts values of type RU.LIST.
>
> Any thoughts on what's going wrong here?
>
> Regards
>
>
> Kenny
>
>
> ------------------------------------------------------
> Kenny MacLeod |
> | Email: [EMAIL PROTECTED]
> Mutant Technology Ltd | Tel: (+44) 171 257 9988
> 12-13 Henrietta Street | Fax: (+44) 171 836 2600
> London, UK WC2E 8LH | WWW: www.mutant-tech.com
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>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
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PO Box 969 http://herzberg.ca.sandia.gov
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