STRING and SYMBOL are two different data types; here's one of the many
forum threads where this has been discussed:
http://www.mail-archive.com/jess-users@sandia.gov/msg07900.html
Calling 'new Value("a")' creates a value of type STRING, while the
values in your retract-string call are SYMBOLs. Check out the other
constructors of jess.Value; they are documented extensively.
On Nov 9, 2010, at 12:23 PM, kartik tadanki wrote:
Hi,
Question How can I use Value object to put in simple strings instead
of java.lang.String instances.?
-I wish to be able to assert facts from Java such that the rules in
the knowledge base can apply to them.
-Currently, I use assertString().
-When I use assertFact() the rules do not apply to the fact as with
assertString()
This is because the slot values are now java.lang.String instances.
How can I avoid building the string for assertString() and use
assertFact() such that the rules
process facts thus asserted?
My code:
=============================================
// (deftemplate Authorization (slot subject ) (slot predicate) (slot
object))
//create fact
Fact fact = new Fact("Authorization", r);
set values
Value va = new Value("a");
fact.setSlotValue("subject", va);
Value vb = new Value("b");
fact.setSlotValue("predicate", vb);
Value vc = new Value("c");
fact.setSlotValue("object", vc);
//assert the fact
rete.assertFact(fact);
// this retractString has no effect.
rete.retractString("(Authorization (subject a) (object c) (predicate
b))");
=============================================
Thank you,
-Kartik Tadanki
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs
PO Box 969, MS 9012 ejfr...@sandia.gov
Livermore, CA 94550 http://www.jessrules.com
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