/**
 * ***************************************************************
 * 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 jade.content.onto;

//#APIDOC_EXCLUDE_FILE

import jade.content.abs.*;
import jade.content.schema.*;

/** 
   This introspector does nothing but "asking objects to convert
   themselves into/from abstract descriptors". It could be used 
   when working in Java environments where the reflection is not 
   supported (MIDP). All classes in an ontology using this introspector
   must implement the <code>Introspectable</code> interface.
   @author Giovanni Caire - TILAB
 */
public class MicroIntrospector implements Introspector {

	/**
       Check the structure of a java class associated to an ontological element 
       to ensure that translations to/from abstract descriptors and java objects
       (instances of that class) can be accomplished by this introspector.
       This is the case if <code>javaClass</code> implements the
       <code>Introspectable</code>
       @param schema The schema of the ontological element
       @param javaClass The java class associated to the ontologcal element
       @param onto The Ontology that uses this Introspector
       @throws OntologyException if the java class does not have the correct 
       structure
	 */
	public void checkClass(ObjectSchema schema, Class javaClass, Ontology onto) throws OntologyException {
		// FIXME: Not yet implemented
	}
	
	public Object getSlotValue(String slotName, Object obj, ObjectSchema schema) throws OntologyException {
		throw new OntologyException("UNsupported operation");
	}

	public void setSlotValue(String slotName, Object slotValue, Object obj, ObjectSchema schema) throws OntologyException {
		throw new OntologyException("UNsupported operation");
	}

	public AbsAggregate externalizeAggregate(String slotName, Object obj, ObjectSchema schema, Ontology referenceOnto) throws OntologyException {
		throw new NotAnAggregate();
	}

	public Object internalizeAggregate(String slotName, AbsAggregate abs, ObjectSchema schema, Ontology referenceOnto) throws OntologyException {
		return null;
	}

	public AbsObject externalizeSpecialType(Object obj, ObjectSchema schema, Class javaClass, Ontology referenceOnto) throws OntologyException {
		try {
			AbsObject abs = schema.newInstance();

			Introspectable intro = (Introspectable) obj;
			intro.externalise(abs, referenceOnto);
			return abs;
		}
		catch (OntologyException oe) {
			// Just forward the exception
			throw oe;
		}
		catch (ClassCastException cce) {
			throw new OntologyException("Object "+obj+" is not Introspectable");
		}
		catch (Throwable t) {
			throw new OntologyException("Schema and Java class do not match", t);
		}
	}
	
	public Object internalizeSpecialType(AbsObject abs, ObjectSchema schema, Class javaClass, Ontology referenceOnto) throws OntologyException {
		try {
			Object obj = javaClass.newInstance();
			//DEBUG System.out.println("Object created");

			Introspectable intro = (Introspectable) obj;
			intro.internalise(abs, referenceOnto);
			return intro;
		}
		catch (OntologyException oe) {
			// Just forward the exception
			throw oe;
		}
		catch (ClassCastException cce) {
			throw new OntologyException("Class for type "+abs.getTypeName()+" is not Introspectable");
		}
		catch (Throwable t) {
			throw new OntologyException("Schema and Java class do not match", t);
		}
	}
}