MusicShopOntology

package examples.content.musicShopOntology;

import jade.content.onto.*;
import jade.content.schema.*;
import jade.content.schema.facets.*;
import examples.content.ecommerceOntology.*;

/**
 * Ontology containing music related concepts.
 * @author Giovanni Caire - TILAB
 */
public class MusicShopOntology extends Ontology implements MusicShopVocabulary {
  // NAME
  public static final String ONTOLOGY_NAME = "Music-shop-ontology";
  
  // The singleton instance of this ontology
  // It "inherits" from the ecommerceontology
  private static Ontology theInstance = new MusicShopOntology(ECommerceOntology.getInstance());
  
  public static Ontology getInstance() {
    return theInstance;
  }
  
  /**
   * Constructor
   */
  private MusicShopOntology(Ontology base) {
    super(ONTOLOGY_NAME, base);

    try {
      //Thre are CDs, tracks, and singles (songs)
      add(new ConceptSchema(CD), CD.class);
      add(new ConceptSchema(TRACK), Track.class);
      add(new ConceptSchema(SINGLE), Single.class);

      //Our cs for a CD 
      ConceptSchema cs = (ConceptSchema) getSchema(CD);
      //extends ecommerceontoloty
      cs.addSuperSchema((ConceptSchema) getSchema(ECommerceOntology.ITEM));
      //A CD has a title
      cs.add(CD_TITLE, (PrimitiveSchema) getSchema(BasicOntology.STRING));
      //and tracks
      cs.add(CD_TRACKS, (ConceptSchema) getSchema(TRACK), 1, ObjectSchema.UNLIMITED);

      //a track
      cs = (ConceptSchema) getSchema(TRACK);
      //has a name
      cs.add(TRACK_NAME, (TermSchema) getSchema(BasicOntology.STRING));
      //and a duration
      cs.add(TRACK_DURATION, (TermSchema) getSchema(BasicOntology.INTEGER), ObjectSchema.OPTIONAL);
      //and pcm
      cs.add(TRACK_PCM, (TermSchema) getSchema(BasicOntology.BYTE_SEQUENCE), ObjectSchema.OPTIONAL);
      
      cs = (ConceptSchema) getSchema(SINGLE);
      cs.addSuperSchema((ConceptSchema) getSchema(CD));
      // A SINGLE only includes two tracks 
      cs.addFacet(CD_TRACKS, new CardinalityFacet(2, 2));
    } 
    catch (OntologyException oe) {
      oe.printStackTrace();
    } 
  }

}