Sender.java

/*****************************************************************
JADE - Java Agent DEvelopment Framework is a framework to develop
multi-agent systems in compliance with the FIPA specifications.
Copyright (C) 2000 CSELT S.p.A. 

GNU Lesser General Public License

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, 
version 2.1 of the License. 

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA  02111-1307, USA.
*****************************************************************/

package examples.content;

import jade.core.*;
import jade.core.behaviours.*;
import jade.lang.acl.ACLMessage;

import jade.util.leap.List;
import jade.util.leap.ArrayList;

import jade.content.*;
import jade.content.abs.*;
import jade.content.onto.*;
import jade.content.lang.*;
import jade.content.lang.sl.*;

import examples.content.ontology.*;

public class Sender extends Agent {
    // We handle contents
    private ContentManager manager  = (ContentManager)getContentManager();
    // This agent speaks the SL language
    private Codec          codec    = new SLCodec();
    // This agent complies with the People ontology
    private Ontology   ontology = PeopleOntology.getInstance();

    class SenderBehaviour extends SimpleBehaviour {
	private boolean finished = false;
	
	public SenderBehaviour(Agent a) { super(a); }
	
	public boolean done() { return finished; }
	
	public void action() {
	    try {
		// Preparing the first message
		System.out.println( "[" + getLocalName() + "] Creating inform message with content fatherOf(man :name John :address London, [man :name Bill :address Paris])");

		ACLMessage msg = new ACLMessage(ACLMessage.INFORM);
		AID receiver = new AID("receiver", false);
			       				
		msg.setSender(getAID());
		msg.addReceiver(receiver);
		msg.setLanguage(codec.getName());
		msg.setOntology(ontology.getName());

		// The message informs that:
		// fatherOf(man :name "John" :address "London", [man :name "Bill" :address "Paris"])

		Man john = new Man();
		Man bill = new Man();
		john.setName("John");
		bill.setName("Bill");

		Address johnAddress = new Address();
		johnAddress.setCity("London");
		john.setAddress(johnAddress);

		Address billAddress = new Address();
		billAddress.setCity("Paris");
		bill.setAddress(billAddress);

		FatherOf fatherOf = new FatherOf();
		fatherOf.setFather(john);

		List children = new ArrayList();
		children.add(bill);

		fatherOf.setChildren(children);

		// Fill the content of the message
		manager.fillContent(msg, fatherOf);

		// Send the message
		System.out.println( "[" + getLocalName() + "] Sending the message...");
		send(msg);

		// Now ask the proposition back.
		// Use a query-ref with the following content:
		// iota ?x fatherOf(?x, [man :name "Bill" :address "Paris"])
		System.out.println( "[" + getLocalName() + "] Creating query-ref message with content iota ?x fatherOf(?x, [man :name Bill :address Paris])");
		msg.setPerformative(ACLMessage.QUERY_REF);

		// Create an abstract descriptor from scratch
		AbsConcept absBill = new AbsConcept(PeopleOntology.MAN);
		absBill.set(PeopleOntology.NAME, "Bill");
		
		// Create an abstract descriptor from a concrete object
		AbsConcept absBillAddress = (AbsConcept)ontology.fromObject(billAddress);
		absBill.set(PeopleOntology.ADDRESS, absBillAddress);

		AbsAggregate absChildren = new AbsAggregate(BasicOntology.SEQUENCE);
		absChildren.add(absBill);

		AbsVariable absX = new AbsVariable("x", PeopleOntology.MAN);
		
		AbsPredicate absFatherOf = new AbsPredicate(PeopleOntology.FATHER_OF);
		absFatherOf.set(PeopleOntology.FATHER, absX);
		absFatherOf.set(PeopleOntology.CHILDREN, absChildren);

		AbsIRE absIRE = new AbsIRE(SLVocabulary.IOTA);
		absIRE.setVariable(absX);
		absIRE.setProposition(absFatherOf);

      		// Fill the content of the message
		manager.fillContent(msg, absIRE);

		// Send the message
		System.out.println( "[" + getLocalName() + "] Sending the message...");
		send(msg);
	    } catch(Exception e) { e.printStackTrace(); }

	    finished = true;
	}
    }
     
    protected void setup() {
	manager.registerLanguage(codec);
	manager.registerOntology(ontology);
	
	addBehaviour(new SenderBehaviour(this));      
    }
}