There's an example of this in section 2.8.2 of the Jess 5.0 (final
version) manual. Here it is:
import jess.*;
import java.util.*;
public class ExQuery
{
public static void main(String [] argv) throws JessException
{
// Create engine, define query and data
Rete r = new Rete();
r.executeCommand("(defquery search (declare (variables ?X)) (foo ?X ?Y))");
r.executeCommand("(deffacts data" +
"(foo blue red)" +
"(bar blue green)" +
"(foo blue pink)" +
"(foo red blue)" +
"(foo blue blue)" +
"(foo orange yellow)" +
"(bar blue purple))");
// Assert all the facts
r.reset();
// Run the query, store the result
r.executeCommand("(store RESULT (run-query search blue))");
// Fetch the result (an Enumeration).
Enumeration e = (Enumeration) r.fetch("RESULT").externalAddressValue(null);
Vector v = new Vector();
// Pick each element of the Enumeration apart and store the
// interesting part in the Vector v.
while (e.hasMoreElements())
{
Token t = (Token) e.nextElement();
// We want the second fact in the token - the first is the query trigger
Fact f = t.fact(1);
// The first and only slot of this fact is the __data multislot.
ValueVector multislot = f.get(0).listValue(null);
// The second element of this slot is the datum we're interested in.
v.addElement(multislot.get(1).stringValue(null));
}
for (Enumeration answers = v.elements(); answers.hasMoreElements();)
System.out.println(answers.nextElement());
}
}
C:\> java ExQuery
red
pink
blue
I think Maren Zubizarreta wrote:
> Hi again:
> While embedding jess in java code,
> I'm trying to retrieve the enumeration generated by a run-query
> command
> into an enumeration I can use in my java code and not like a jess
> command.
> Does anybody know what method to use?
> Thanx
>
>
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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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