Jess is very flexible, perhaps too much so, because there are always
lots of ways to do things.
In the program you've written here, first you want to instantiate a
jess.Rete object and store it in a member variable. When you
instantiate it, use either Rete.batch() (if your version has this
method) or just Rete.executeCommand("(batch filename.clp)") to read
in your Jess code.
Then in your event handler, assert the fact by calling the
appropriate method on your Rete member object. There are many ways to
do it: you could use executeCommand() again, or assertString(), or
even build a jess.Fact object and call assertFact(). Then your
handler can call Rete.run(). You might want it to call Rete.reset()
before asserting the fact.
Then when your rule fires, you want it to communicate back to your
Java program. One easy way to do this would be with the store/fetch
mechanism, which is described in the manual and also in the book on
pages 308-309. Have the right-hand-side of the relevant rule store
the result. The rule could also make changes directly to the GUI if
you like, or do many other things: as I said, there are lots of
different ways to do it.
On Mar 17, 2007, at 11:02 PM, ricktee wrote:
Hi,
I am using a java frame as a menu to let user enter some inputs.
The java
program will then construct a assert string and send it to JESS to be
processed and get back a JESS object.
I read the "JESS in action" book but I'm still confused, how do I
run the
JESS and pass the assert string to it. How can I get the output of
the JESS
program?
I have attached a scaled down version of my program, at "send to jess"
button click it will send a string to JESS, and JESS is suppose to
return a
user-shoes fact to java, recommending soccer-boots.
http://www.geocities.com/t_web_design/TestFrame.java
http://www.geocities.com/t_web_design/shoes.txt (yahoo won't let me
upload
it as shoes.clp)
I'm justing java 1.509 (and IDE JCreator) and Jess61p4. Can you
please point
me to a similar example or please help me with the codes?
thanks a bunch and rgds
rick
Below is the code of the above 2 files
**********************************************************************
******
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.text.*;
public class TestFrame extends JFrame implements ActionListener{
//declare JTextFields for input
private JTextField inputField, outputField;
//declare JLabel for labelling
private JLabel inputLabel, outputLabel;;
//declare buttons
private JButton exitButton, computeButton;
//frame method
public TestFrame(){
//frame's settings
setTitle("version 1.0"); //set title of frame
setBounds(50,50,650,200); //set window
//PANEL:input, to put the input & output fields
JPanel inputPanel = new JPanel();
inputPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
inputLabel = new JLabel("String to pass to Jess: ");
inputField = new JTextField(40);
outputLabel = new JLabel("Jess to return something: ");
outputField = new JTextField(40);
//add the Label & Field into the panel
inputPanel.add(inputLabel);
inputPanel.add(inputField);
inputPanel.add(outputLabel);
inputPanel.add(outputField);
inputField.setText("(assert (user (age 27) (weight 120) (height 509)
(ex-program soccer) )) ");
//PANEL:button, store 3 buttons, contentPane=SOUTH
JPanel buttonPanel = new JPanel();
//create Panel for 'button'
buttonPanel.setLayout(new FlowLayout(FlowLayout.RIGHT)); //
set flow
layout
computeButton = new JButton("Sent to Jess"); //create 'compute'
button
exitButton = new JButton("Exit"); //
create 'exit'
button
buttonPanel.add(computeButton); //add 'compute' button
into
Panel
buttonPanel.add(exitButton); //add 'exit'
button into
Panel
computeButton.addActionListener(this); //add listener to
'compute'
button
exitButton.addActionListener(this); //add listener to
'exit'
button
Container contentPane = getContentPane();
contentPane.add(buttonPanel, BorderLayout.SOUTH); //add
buttonPanel to
SOUTH
contentPane.add(inputPanel, BorderLayout.CENTER); //add
inputPanel to
CENTER
} //close GymTrainerFrame()
//detect mouse click
public void actionPerformed(ActionEvent e){
Object source = e.getSource();
//get source of click
if (source == exitButton)
//check if exit button is clicked
{ System.exit(0); }
//exit prog
if (source == computeButton) //if clear button is clicked
{ //send to JESS
}
} //close actionPerformed()
//MAIN: make the frame show up
public static void main(String[] args)
{
JFrame frame = new TestFrame(); //create the frame
frame.show(); //show the frame
} //close main
}
**********************************************************************
****
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;user object
(deftemplate user
(slot age)
(slot weight)
(slot height)
(slot ex-program) );;close
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;user footwear object
(deftemplate user-footwear
(slot ident) );;close
;;;;;;;;;;;;;;;;;;;;;;;;;;;; check if user is playing soccer, if so
recommend soccer boots
(defrule print-user (user (ex-program soccer))
=> (assert (user-footwear (ident soccer-boots))) );;close
(reset)
(focus)
(run)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;code to create user fact with user
playing soccer
;;;(assert (user (age 27) (weight 120) (height 509) (ex-program
soccer) ))
--
View this message in context: http://www.nabble.com/How-to-use-java-
interface-to-pass--get-facts-from-JESS-tf3421248.html#a9535635
Sent from the Jess mailing list archive at Nabble.com.
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