I think [EMAIL PROTECTED] wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> Hi all,
>
> I have a package DateFunctions conatining 'class Before implements Userfunction'.
>Inside 'Before' I expect two instances of GregorianCalendar and simply call
>GregorianCalendar.before() on them.
>
> To use it from jess, as I understand, I will have to
> create two instances of java.util.GregorianCalendar in jess using
>
> (bind ?dt1 (new java.util.GregorianCalendar))
> (bind ?dt1 (new java.util.GregorianCalendar))
>
> and call (before dt1 dt2)
Well, yes; you don't have to create the two instances this way, of
course. They could come from outside of Jess, or be returned by a
function call, etc.
>
> My question is, when these instances dt1 and dt2 are converted to Value, are they of
>type RU.ATOM or RU.EXTERNAL_ADDRESS. What do these types represent.
An RU.EXTERNAL_ADDRESS Value holds a Java object; an RU.ATOM holds a
symbol. Any values that hold a GregorianCalendar are going to be
RU.EXTERNAL_ADDRESS values.
>
> Will things be any diffrent if I went the java route and did a
> new GregorianCalendar() followed by rete.definstance() and rete.executecommand("
>(before dt1 dt2)")
>
definstance() is used to enable pattern-matching on Java Beans from
rule LHSs; it's not relevant here. But let me answer your question by
rephrasing it: would things be any different if you did
GregorianCalendar dt1 = new GregorianCalendar();
GregorianCalendar dt2 = new GregorianCalendar();
rete.store("dt1", dt1);
rete.store("dt2", dt2);
rete.executeCommand("(before (fetch dt1) (fetch dt2))");
The answer is no, this is no different; this would work just the same
as your previous example.
> Thanks very much.
>
> Dheeraj
>
>
>
>
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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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