Hi Lucia,
Basically the issue is that Jess has two completely different text-
like data types: RU.STRING, which are double-quoted Strings that can
contain spaces and punctuation, and RU.SYMBOL, which don't have quotes
and generally look like Java identifiers. They're not the same, and
comparing them always returns false -- i.e.,
Jess> (eq "HELLO" HELLO)
FALSE
You need to know which you're dealing with, and use one type or the
other consistently. JavaBeans with String properties always use
RU.STRING. On the other hand, the function ValueVector.add(String),
which you're calling in your Java code snippet below, will create a
Jess value of type RU.SYMBOL . Instead, you probably want to say
result = jessEngine.runQueryStar("llamados", new
ValueVector().add(new Value("metodo1", RU.STRING)));
Just make sure you use RU.STRING everywhere, and your code should work
fine.
On Sep 2, 2009, at 3:54 PM, Lucia Masola wrote:
Hello, I'm writting an expert system in jess. It includes the two
kinds of templates, the ones that you can define from java (using
declare from-class) and the ones that you define directly in the clp
archive. The beans are all of the same kind, all of the contains
Strings.
I've experimenting some problems when I want to execute a query that
is defined in the clp archive from java, regarding a template
defined a java bean. When i want to pass a parameter, the rules does
not match with any of the facts. Jess engine had stored the strings
of the beans with "". Does anyone can give me a tip in how to
execute a query from java regarding facts created as java bean
objects???
Here is the query that i run from java:
QueryResult result;
try {
result = jessEngine.runQueryStar("llamados", new
ValueVector().add("metodo1"));
while (result.next()) {
System.out.println(result.getString("caller_id") +
" " + result.getString("callee_id")));
addFanInMetric(ff);
}
} catch (JessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Here is the clp archive:
(import JessIntegrationModel.*)
(deftemplate Call (declare (from-class Call)))
(deftemplate llamado_no_directo
"comment"
(slot caller_id)
(slot calle_id))
(deftemplate metodoFamiliar
(slot metodo1)
(slot metodo2)
)
(deftemplate metodoFamiliar_counted
(slot metodo1)
(slot metodo2)
)
(defrule propagarLlamadas
(declare (salience 500))
(Call (callee_id ?metodoLlamado)(caller_id ?metodoLlamador))
(metodoFamiliar (metodo1 ?metodoLlamado)(metodo2 ?metodoFamiliar))
(not (metodoFamiliar_counted(metodo1 ?metodoLlamado)(metodo2 ?
metodoFamiliar)))
=>
(assert (metodoFamiliar_counted(metodo1 ?metodoLlamado)(metodo2 ?
metodoFamiliar)))
(assert (llamado_no_directo(calle_id ?metodoFamiliar)(caller_id ?
metodoLlamador)))
)
(defquery llamados
"comment"
(declare (variables ?ln))
(call_counted (caller_id ?Caller) (callee_id ?ln))
)
(defquery llamadosNoDirectos
"comment"
(declare (variables ?ln))
(llamado_no_directo (caller_id ?Caller) (calle_id ?ln))
)
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com
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