Unless you've left out some code, the "(focus interview)" should
throw an exception, as I see no such module defined here. But aside
from that, the other problem is that when the rules fire, the stored
ArrayList is not the same one that's in the defglobal. You define the
defglobal, which creates an ArrayList; then you store a reference to
the ArrayList using the store function. Later, you call "reset",
which, by default, resets all defglobals; here, this will create a
new ArrayList, so that the one in the defglobal is not the same one
that's been stored.
Either 1) wait to do the store after the reset; 2) call reset before
loading the Jess code; or 3) use (set-reset-globals FALSE) to change
the default behavior. Calling this function will prevent Jess from
resetting global variables when reset is called.
On Jan 2, 2007, at 5:59 AM, Venkat Kasuganti wrote:
I have the following jess code (based on code in JESS in Action):
defglobal ?*a* = (new java.util.ArrayList))
;;(defglobal ?*b* = (new java.util.ArrayList))
(store quest ?*a*)
(deftemplate question (slot ident)(slot text)(slot type))
(deftemplate answer (slot ident) (slot ans))
(deffacts question-data
(question
(ident name)
(text "What is your name?")
(type 1))
(question
(ident age)
(text "What is your age?")
(type 2))
(question
(ident occupation)
(text "What is your occupation?")
(type 1)))
(defmodule ask)
(defrule ask-question
(declare (auto-focus TRUE))
(MAIN::question (ident ?id)(text ?t)(type ?type))
;;(not (answer (ident ?id)))
?ask <- (MAIN::ask ?id)
=>
;;(printout t ?t crlf)
(bind ?b (new java.util.ArrayList))
(?*a* add ?b)
(?b add ?id)
(?b add ?t)
(?b add ?type)
(retract ?ask)
(return))
(defmodule questions)
(defrule request-name
=> (assert (ask name)))
(defrule request-age
=> (assert (ask age)))
(defrule request-occupation
=> (assert (ask occupation)))
And the following java code calls the hashmap handle "quest" to
convert contents of the Value object as a java generic object.
import jess.*;
import java.util.*;
public class Bridge {
public static void main (String args[]) throws Exception {
Rete engine = new Rete();
String s = "(batch taxcube.clp)";
engine.executeCommand(s);
engine.reset();
String t = "(focus interview)";
engine.executeCommand(t);
engine.run();
Value myValue = engine.fetch("quest");
Object o = myValue.javaObjectValue(engine.getGlobalContext());
System.out.println(o);
ArrayList superArray = (ArrayList) o;
System.out.println(superArray);
//System.out.println(superArray.get(0));
}
}
My problem is that the ArrayList that I have fetched in the global
context is returned empty despite rules getting executed and the
arraylist being populated with the question data in the ask module.
How do i get the populated arraylist(s)?
Please help
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