/**
 * Section 5.1.3.1 Page 82
 * Ontology of the Book Trading Example.
 **/
package bookTrading.ontology;

import jade.content.onto.*;
import jade.content.schema.*;

public class BookTradingOntology extends Ontology implements BookTradingVocabulary {
  // The name identifying this ontology
  public static final String ONTOLOGY_NAME = "Book-trading-ontology";

  /** As explained in section 5.1.3.6 pag. 90, it is suggested to move
   * all the following constants, which represent the Vocabulary of the ontology, 
   * into the BookTradingVocabulary interface
  // VOCABULARY
  public static final String BOOK = "Book";
  public static final String BOOK_TITLE = "title";
  public static final String BOOK_AUTHORS = "authors";
  public static final String BOOK_EDITOR = "editor";
  public static final String COSTS = "Costs";
  public static final String COSTS_ITEM = "item";
  public static final String COSTS_PRICE = "price";
  public static final String SELL = "Sell";
  public static final String SELL_ITEM = "item";
  **/

  // The singleton instance of this ontology
  private static Ontology theInstance = new BookTradingOntology();

  // Retrieve the singleton Book-trading ontology instance
  public static Ontology getInstance() {
    return theInstance;
  }

  // Private constructor
  private BookTradingOntology() {
    // The Book-trading ontology extends the basic ontology
    super(ONTOLOGY_NAME, BasicOntology.getInstance());
    try {
      add(new ConceptSchema(BOOK), Book.class);
      add(new PredicateSchema(COSTS), Costs.class);
      add(new AgentActionSchema(SELL), Sell.class);

      // Structure of the schema for the Book concept
      ConceptSchema cs = (ConceptSchema) getSchema(BOOK);
      cs.add(BOOK_TITLE, (PrimitiveSchema) getSchema(BasicOntology.STRING));
      cs.add(BOOK_AUTHORS, (PrimitiveSchema) getSchema(BasicOntology.STRING), 0,
             ObjectSchema.UNLIMITED);
      cs.add(BOOK_EDITOR, (PrimitiveSchema) getSchema(BasicOntology.STRING), ObjectSchema.OPTIONAL);

      // Structure of the schema for the Costs predicate
      PredicateSchema ps = (PredicateSchema) getSchema(COSTS);
      ps.add(COSTS_ITEM, (ConceptSchema) cs);
      ps.add(COSTS_PRICE, (PrimitiveSchema) getSchema(BasicOntology.INTEGER));

      // Structure of the schema for the Sell agent action
      AgentActionSchema as = (AgentActionSchema) getSchema(SELL);
      as.add(SELL_ITEM, (ConceptSchema) getSchema(BOOK));
    }
    catch (OntologyException oe) {
      oe.printStackTrace();
    }
  }
}