I think that Jeremic Zoran wrote:
>>I need the function that will remove all facts of specific deftemplate =
>>from Jess memory. It should be written as java function ...
Hi Zoran,
My class is attached (most of it is just a test harness).
Run it and see if this is what you want and let me know either way.
One thing that I didn't do was check if the deleted facts had children
(facts that inherited from a parent fact) -- I'll leave that for you to
code! :-D If you're not using inheritance, then the code works fine.
Cheers!
Jason
------------------------
Jason Morris
Morris Technical Solutions
[EMAIL PROTECTED]
www.morristechnicalsolutions.com
fax/phone: 503.692.1088
import jess.*;
import java.util.*;
public class FactRetractor {
public static void main(String[] args) {
FactRetractor fr = new FactRetractor();
// Retract by name
fr.retractAllFactsOfType("MAIN::foo");
// Retract by reference to deftemplate object
Deftemplate deftemplate = fr.getDeftemplateByName("MAIN::bar");
fr.retractAllFactsOfType(deftemplate);
}
StringBuffer batch;
Rete engine;
public FactRetractor() {
init();
}
public Deftemplate getDeftemplateByName(String name) {
Iterator itt = engine.listDeftemplates();
Deftemplate deftemp = null;
while (itt.hasNext()) {
Deftemplate next = (Deftemplate) itt.next();
if (next.getName().equals(name)) {
deftemp = next;
}
}
return deftemp;
}
public void init() {
this.engine = new Rete();
batch = new StringBuffer();
try {
engine.watchAll();
// Get a deftemplate loaded
batch.append("(deftemplate foo");
batch.append(" (slot id)");
batch.append(" (slot data))\n");
batch.append("(deftemplate bar");
batch.append(" (slot id)");
batch.append(" (slot data))\n");
engine.executeCommand(batch.toString());
batch.setLength(0);
engine.reset();
// Generate some random facts
for (int i = 0; i < 5; i++) {
engine.assertString("(foo (id " + i + ") (data "
+ Math.random() + "))");
}
for (int j = 0; j < 5; j++) {
engine.assertString("(bar (id " + (j) + ") (data "
+ Math.random() + "))");
}
} catch (JessException jex) {
jex.printStackTrace(System.err);
}
}
public void retractAllFactsOfType(Deftemplate deftemplate) {
try {
Iterator itt = engine.listFacts();
while (itt.hasNext()) {
Fact fact = (Fact) itt.next();
if (fact.getDeftemplate().equals(deftemplate)) {
engine.retract(fact);
}
}
} catch (JessException jex) {
jex.printStackTrace(System.err);
}
}
public void retractAllFactsOfType(String qualifiedDeftemplateName) {
try {
Iterator itt = engine.listFacts();
while (itt.hasNext()) {
Fact fact = (Fact) itt.next();
if (fact.getDeftemplate().getName().equals(
qualifiedDeftemplateName)) {
engine.retract(fact);
}
}
} catch (JessException jex) {
jex.printStackTrace(System.err);
}
}
}
